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习题练习:Physics Unit2: Kinematics One Dimensional Motion



 作者: physics   总分: 98分  得分: _____________

答题人: 匿名未登录  开始时间: 22年07月19日 23:10  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that an object travels from oner ir;ckb9z v23ies.t8-evj7y point in space to another. Make a comparison between the displacement and the dc27i. ;9srvzvtre 8yeibkj3 -istance traveled.

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When is the average velocity of an object equal to the instantaneous velocit3rlg 9:*1zfc;e57wdozko zqf9 j8x ity?

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A new car manufacturer advertib.y f+ g:+twf3bqvq u(c/)ojekt-v --xz wmn8ses that their car can go "from zero to sixty in 8 /q3e :mft+ .jcxu vv--wy(gt8-)f wqkz+ bno bs". This is a description of

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object moving in the +x axis experiences an acceleratiwp *ehc 1t20yhpde j+34qnq 4gon of $2.0 \; m/s^2$. This means the object is

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that a car traveling to the East (+x rlyxc-p+;g rsb-+ yo gcd(be)dz:*)w direction) begins to slow down as it approaches a traffic light. Make a statement concernirr(xd+;g-+czy wo-*bp )bec)l yd sg:ng its acceleration.

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that a car traveling to the West (-x direction) begins to slow d*t0ulp;+ u, 9a8bu q9wgxa rvwe 0rn/vown as it apaeb8n+x0 ww ,r;9v luuuqp9gtv0*ar/ proaches a traffic light. Make a statement concerning its acceleration.

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that an object is moving with a ,q;l/ 8.kldon:zp ty xconstant velocity. Make a statement concerning its ac,o/np .: lkl8;ytxzqdceleration.

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the velocity of an object is zero, do;i j-w(zh+,vkratia (es it mean that the acceleration is zero? Support your answer wita a( jhtvkri;(+ z-,iwh an example.

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Can an object's velocity change direction;0; ugm816javoe;1uzaes (do 0meo xp when its acceleration is constant? Support your answer with an examp p;0o ;( 1ouzdj06a;ueae1eov sm8xg mle.

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that an object is moving with constanti pg:jv(w mgc0*6wd*s/iq 0 kb acceleration. Make a statement iqpwb( gk* sv*jg m/:w c600idconcerning its motion with respect to time.

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Can an object have increasing speed wnrhkxwa a5.*ep/vra 0gtn *8/hile its acceleration is decreasing? Support you*hr8k/wg0e vn/ar ptxan5a*.r answer with an example.

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a can, after an initial kick, moves up along a smooth hill of ice.kp2w+.eswvek * ;jnlfpvsvxw6o* i,(r8y 05o Make a statementek rv*ykjpw 2s0* (o6x,s5w .i+lvewof nv;p8 concerning its acceleration.

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Under what condition is ave//lp+ evyg0jt rage velocity equal to the average of the object's initial+e tlgvp /yj/0 and final velocity?

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Objects A and B both start at rest. They both accelerate at the same +v:wu wmb:og 4k09fh hf ko8f0rate. However, object A accel :+8w:umgfh 49f0bvofhwkko0 erates for twice the time as object B. What is the final speed of object A compared to that of object B?

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Objects A and B both start from rest. T40o3hi sjf/ 5wgz/ri ad5zsi,hey both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A compa0zjg5 / 5ohsiriadsiz3 f 4w,/red to that of object B?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When an object is released from rest and falls in ;a ; /,.dmtgg1d qcdnkthe absence of friction, which of the following is true concerning its motio ;tg.;dkq1dcdg/n,m a n?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When an object is released from rest and falls in the absence of friction, whichq9h 1yfkt*(8d ;ujma g of thtd (*kam1jy; ug 9h8qfe following is true concerning its motion?

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown straight up. Make a statement about the velocity and 2vfn,b3 in5ee the e5ve2bni3f, n acceleration when the ball reaches the highest point.

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown straight up. What is its acceleraz- t,pv sg.xqacb)d;1tion just before it reaches its highest point?p.xsd;-bztc q 1)agv,

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown straightfj*3pe)rz gv l/ p)1w 51oabzn up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the balllj3*po) /1bngevrzzwf51)p a is going up.

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown straight uam4h+z/yd joc -1 qx)up, reaches a maximum height, then falls to its initial heigoy- j1d/umq4z xca)h+ht. Make a statement about the direction of the velocity and acceleration as the ball is coming down.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown downward in thebt1faly9x8(wm9t f8/s n yxq * absence of air resistance. Make a statement concerning its accelewa 9y/* n(t8t1 xfb msx8y9flqration.

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a skydiver jumps fro odmag qt:pv,g 4z 66xt k5,v7u0yv:sgk mh+:im a high-flying plane. What is her acceleration when she she reaches terminal velocg,:4vt v+7 o:pum6 da k0 ti,:qm6gyhgz v5ksxity?

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown vertically upward with a speed v.9a:hprg0y5w8 0s w e2 jgucg7y An identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the second ball to that of the first ball? (How many times higher does the second ball go than the first 7yh 25 gguway:rc08w9 pjsg e0ball?)

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Ball A is dropped from the top of a building. One second later, ba u-)l)uqyz d bkyxw:-)ll B is dropped from the same building. As time progresses, the distuw)yu d qy-)-bl:)kzxance between them

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Ball A is dropped from the top of a building. One secondk0zm jh3p )fqr-*tp)x later, ball B is dropped from the same building. As time progresses, the d0t3j kr)zm)-hpp*x q fifference in their speeds

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two objects are thrown from the top of a tall building. One is thr;s (xambv vbu4q /g8e3own up, and the other is thrown do4uqv bgxv/ ab;3m8s(e wn, both with the same initial speed. What are their speeds when they hit the street?

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A brick is dropped from the top of a building. A second brick is thrown ssh zb4yno (82rtraight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations obyh4z 82( snorf the two bricks.

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving with constant non-zero velocity in the +x axwuihr9 l*w.g(c ecl a 6(a*km-is. The position versus time graph of this objelwk*gmc9*a hwle 6ca u.(i- (rct is

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving with constamj+*da 6nd,mx nt non-zero acceleration in the +x axis. The position versus time graph oj*,dna dmmx 6+f this object is

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving with conf vds*+3 z i o7ezuyo)5 fia2:2lky)fwstant non-zero velocity in the +x axis. The velocity vers w)25fe)syiaz3*vzu :o2fo7ky +dlf i us time graph of this object is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving with constant non-zero acceleration in the +x axis. T(frp2j 21inn3jjj )h; noxd oo7h 5-zyhe velocity versus - z3712hj2dif p rjhj)( onyonjo n;5xtime graph of this object is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The slope of a position versus time gn22aq q3q:m*3hbvdi qraph gives

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The slope of a velocity versusro*eoc*os paf 3v6k33 time graph gives

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The area under a curve in an acceleration versugc3f8al lbuvh yl5c,7 e4xh6;s time graph gives

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The area under a curve i xe: 0eswh3,lcn a velocity versus time graph gives

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the position versus time graph of an object is a horizontal line, the obj iqa3n6r -h:etect ish:6tirn -ae3 q

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the position versus time graph of an object is a vertical line, the object isbrlu0kj.lu b5o)x*smc-:;, s a/sfxa4q r3 vbj qbm r. bk 5,sr*u u4;savsax:0c l3b)-fox/l

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the velocity versus time : . e3fp 9bhfiup*r/tigraph of an object is a horizontal line, the object :*iiuftp.f /ebphr39 is

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the velocity versus time graph of an object ,cerb43cxq*0io n ;)w sm*zae is a straight line making an angle of 30 degrees with the time axis, then xob q03crze;*camei ,*)4s w object is

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object moves 15.0 m north and )xfifuembt5v gs 4l4187/u ps v-1(7 b twegypthen 11.0 m south. Find both the distance traveled and the magnitude of the dis8-vb4)(ltupv 1xg1 syie 7f/bp4sm gwut5e 7fplacement vector.

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A boat can move at 30 km/h in still water. How long will it take to move 12 wvw7 d5ofo+s ri6iy; r67 *vagkm upstrgrya 6i dwr77vi *;oov56wsf+eam in a river flowing 6.0 km/h?

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  55 mi/h is how many m/s?en 2f4:zrtc3 o j)+ fl8ttm9qu (1 mi = 1609 m)

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What must be your averag (qk8il-meva (yr5;kye speed in order to travel 350 km in 5.15 h?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A runner ran the marathon (approximately 42.0 km) in 2ytxq y.*kw8p* hours and 57 min. What is thqt pwk **8y.yxe average speed of the runner in m/s?

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car travels 90 km/h. How long cvb j(m3c;h0g+mr-cb does it take for it to travel 400 km?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ly (light year) is the distance that9 ts qzd.n6au-tg:*jvd7 ws c6 light travels in one year. The speed of light is 3.00 x 108 m/s. How many miles are there in a ly? (1 mi = 1609 m, 1 yr = 36 -9v7n6cds qt tsj* d6w.zu:ga5 d.)

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you are driving 72 km/h along a straigbdezb46bb+,0t u kr1yj8g5dw ht road and you look to the side for 4.0 s, how fb5,u4 b6 w1 8 jdeytz+rk0bdbgar do you travel during this inattentive period?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you run a complete loop around an outdoor track5: for-5 vdsk-0b zjonx dg,ilz *9jh6 (400 m), in 100 s, your average velocix60fbn 5 -jz lz-9 :kors,dj*d5iv ohgty is

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A polar bear starts at the North Pole. It travels 1.0 ,ysxggkpg.4w-d(2rk d9f 0jthf2 zs5km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its s0h(gry2 9k zswdk-5g,t4f. spxd f g2jtarting point. This trip takes 45 min. What was the bear's average speed?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A polar bear starts at the Nor etl4( ;8cc:4g gdkopbm7 gj;oth Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 kmg: b74ogpg cmet84( ljock;d ; north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bear's average velocity?

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are driving home on a wee.ouy481: dukp/aazofkend from school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes.zf p: o148aadyk./ouu How far is your hometown from school?

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What is the av+42lwk cn1f*ln ipwp+u 0ofqrx44-qoerage speed of the motorist for this triqk1iq l+4f*op4p 2fonwclu +4rx 0n w-p?

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What .x y spc2y9uoeu kz61)h*ro-nis her averageyk o*9u r)z 2- y1se.ohpunxc6 speed for the trip?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane travels at 300 mi/h south for 2.00 h ane2 9, sc0d(q2upuscye d then at 250 mi/h north for 750 miles.ecc9 (s2yps0 , uq2due What is the average speed for the trip?

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a 400-m relay race the anchorman (t qr/,iv+l3e rehe person who runs the last 100 m) for team A can run 100 m in 9.8 s. His rival, the anchorman for team B, can cover 100 m in+iqe,/err 3 vl 10.1 s. What is the largest lead the team B runner can have when the team A runner starts the final leg of the race, in order that the team A runner not lose the race?

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car decelerates uniformly ando k/mn,fdeqnyvz5 0erx) ks.62goc7* comes to a stop after 10 s. The car's average velocity during deceleration was 50 km/h. What x )sodr q*0e v2fzy5/kc g,n.neom76kwas the car's deceleration while slowing down?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane increases its speed from 100 m/s b4(-wl3y35cs(,bwzkfb g ga bfzsy3/ to 160 m/s, at the average rate of zws(yw3/bbf lckgb3 g5y( ba, f4z3- s$15 \; m/s^2$. How much time does it take for the complete increase in speed?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car traveling 60 km/h accelerates aoz.odlbrp9m i5:: tc d8s x2;lt the rate of $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A cart starts from rest and acyw0a0wrr :akgz5a4u -celerates at $4.0 \; m/s^2$ for 5.0 s, then maintain that velocity for 10 s, and then decelerates at the rate of $2.0 \; m/s^2$ for 4.0 s. What is the final speed of the car?

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car travels at 15 m/s for 10 s. It then speeds up with a constant accelu jfa(gzxs;z2 qger/a(,-+v meratiojuf-( +v(ggearmq za ,zs/x2 ;n of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A cart with an initial velocity of 5.0 m/s expepk8-tzjyxveo1 57)dd6n ;vzoriences a constant acceleration of dvz ky7vp6x 58 z;-o djen1o)t$2.0 \; m/s^2$. What is the cart's displacement during the first 6.0 s of its motion?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bullet moving horizontally to the right (+x-dpc/4t eqpy- direction) with a speed of 500 m/s strikes a sandbag and penet-yq4/ep- pcd trates a distance of 10.0 cm. What is the average acceleration, in $m/s^2$, of the bullet?

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A jet fighter plane is launched from a catapult on an aircraf ud5w7t,5ndcc7b (lg xty4m) )cz2 oqrt carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is constant, )zowr7dx)5gcln74d,( u m5 tyq c2ctbwhat is the length of the catapult?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car starting from rest moves withq)tgwxh un6d 476nw+ b constant acceleration of $2.0 \; m/s^2$ for 10 s, then travels with constant speed for another 10 s, and then finally slows to a stop with constant acceleration of
-$2.0 \; m/s^2$. How far does it travel?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car goes from 40 m/s to 80 m/s in a distance of 200 m. What is its average a*)*g 6 j4z c:vh7yawxx5th r*ef; l .m0kyiajjcceleratit7z*k)ahl a6jchv w. 5m*fex grjj;y4x*0y:i on?

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object starts from rest and undergoes uniform acceleration. During tf*-k )rr(o fgx frf-w8lnr*9 the first second it travelsf-k9wr -*ftlfgx r*fr) ( rn8o 5.0 m. How far will it travel during the third second?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving in a straight line with constant accerzk5 h 3zxy1zolg.w67leration. Initially it is trav5o61 7.w gyz lzzx3rkheling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this time?

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car starts from rest and acceleratqjegj 05css v1ab*nz. zcdf8d0- o:q (es uniformly at $3.0 \; m/s^2$. A second car starts from rest 6.0 s later at the same point and accelerates uniformly at $5.0 \; m/s^2$. How long does it take the second car to overtake the first car?

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70#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A car with good tires on a dry road can m99 csrrv7k,v d8 d1vn3i) rbtdecelerate at about $5.0 \; m/s^2$ when braking. Suppose a car is initially traveling at 55 mi/h.
(a.) How much time does it take the car to stop?
(b.) What is the stopping distance?
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71#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
At the instant a traffic light turns green, a carsui 07l/sr +b-o0pae y that has been waiting at the intersection starts ahead witho blri7ps+syu 0 -0a/e a constant acceleration of $2.00 \; m/s^2$. At that moment a truck traveling with a constant velocity of 15.0 m/s overtakes and passes the car.
(a.) Calculate the time necessary for the car to reach the truck.
(b.) Calculate the distance beyond the traffic light that the car will pass the truck.
(c.) Determine the speed of the car when it passes the truck.
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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is thrown upward with a speed of 12 p b :n.r5oh9xo3fs3 vam/s on the surface of planet X where the acceleration due to gravity is 9:bfhn r.sx3 opvo5a 3$1.5 \; m/s^2$. What is the maximum height reached by the object?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is thrown upward with a speed of 12 m/s on t)xuttjqi jsd*zkd;/4 w80yrb4r 5q5 qhe surface of planet X where the acc 0bq/ )5j4jr;x8utydstwz4 5 *qqirkd eleration due to gravity is $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is thrown u+ fshh6;a0squpward with a speed of 15 m/s on the surface of planet X where the acceleration due to g;u0 6s qasfh+hravity is $2.5 \; m/s^2$. How long does it take for the object to return to where it is thrown?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is thrown upward with a sp.axg2 :jyqokabcc zo2g8u3,;1y v,pfg,or 6n eed of 14 m/s on the surface of planet X where the acceleratizg3y8gxo1j,:;r22,vcgnuopc k6f ,qay.ba o on due to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Human reaction time is usua1f+b dm:prp, illy greater than 0.10 s. If your friend holds a ruler between your fingers p1+fpi bd, mr:and releases it without warning, how far can you expect the ruler to fall before you catch it?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown upward at a velocity of 19.6 m/s. W2dgfn(d sb cp:-12x fahat is its velocity after 3 db2-c :gs( ad1ffxp2n.00 s?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bullet shot straight up returns to its stf*x/ ) xzh)krqarting point in 10 s. What is the initial speed of the bu) z)x *rkf/hqxllet?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown straight up with a speed of 36.0 m/s. How long does it take to ,4 gdvoh6y. pcxf3wfr)o0 bbg2w/ 9bb return to its 6 9)bf bw.y0/bfdr gx,och2v4p g3wobstarting point?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown downward from the top of a building with)c:c iq*sapql1oj+ar:a1 5cr an initial speed of 25 m/s. It strikes the ground after a:oq15rplcj :a i+ q1scr*c) a2.0 s. How high is the building?

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81#
 
填空题 ( 3.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown straight up with a speed of 30 m/s. (ongi -3. 1p/ay: delrlpvly fill in numerical value in the br l: p-plg/ei1.v3 aydlanks)
(a.) How long does it take the ball to reach the maximum height?    $s$
(b.) What is the maximum height reached by the ball?    $m$
(c.) What is its speed after 4.2 s?    $m/s$

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82#
 
填空题 ( 4.0 分) 切至整卷模式 搜藏此题  
  A foul ball is hit straight up into the s1+zkt5 ( tpxu o+qxwelj5c;4air with a speed of 30.0 m/s. (only fill in numu z1+4lt5spw ;x cxk+tqj 5eo(erical value in the blank)
(a.) Calculate the time required for the ball to rise to its maximum height.    $s$
(b.) Calculate the maximum height reached by the ball.    $m$
(c.) Determine the time at which the ball pass a point 25.0 m above the point of contact between the bat and ball for the first time.    $s$
(d.) Determine the time at which the ball pass a point 25.0 m above the point of contact a second time.    $s$

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the velo3jh fjxi1 y a(a/i1p;ncity at t = 1.0 s?


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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the velocity 9qo q0 t1l/tmqn*p,u lat t = 2.5 s?


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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the velo1y 0r:ptv q/c7lx/h 1 otc*mjvcity at t = 4.0 s?


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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the tx*xqf2,q c qu84hv79v bx np(g*ceh4velocity at t = 5.5 s?


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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the average velocity *j fwqtrg/vz 1;j3a2u from 0 to 4.0 s?


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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the average velocity frr bhias+wy8;ci8n+xcpn/a gu:4 pi* *om 0 to 6.0 s?


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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the acceleratios 35gang0. zok +fjc7nn at 1.0 s?


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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is/kcaejuc* .1a(t6ucy h aa36o ts:vl5 the acceleration at 3.0 s?


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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the average acceleration from 0 t8qjuvb-ora0kt vn3ki:3jy*70 fjx ,u o 5.0 s?


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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the average accelje1( pqs b2exd) rfjki5 ./3bkeration from 0 to 8.0 s?


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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the displacement frytzk+6zd i2f0om 0 to 8.0 s?


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