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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 t3-7iva1u6mc, da ut cqravels from one point in space to another. Make a comparicm3 da6vu1u7caq -it, son between the displacement and the distance 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 obj/blg0tyaqe0 v)3-qo9xxl rxd) s -s e xf-ud90ect equal to the instantaneous velocity?

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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 advertises zru6mp:k 9ipv fo0pbcq+1: 4ithat their car can go "from zero to sixty in 8 s". This is vb 6 zfq01u:ip 4k mprco:9ip+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 +xv8w2 2 xwfav.ics.z v4 axis experiences an acceleration 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 direction) begins to sloqvvn+*b91oodry t0)ow down as it approaches a traffic light. Make a statem9 nv0ob q*ov)1tr+ dyoent concerning 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 travelinzp9ne *sy)uu 1g to the West (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its accnpusez)91u *yeleration.

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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 csqzm7 x k7y u65. +:gzlg tj(d8zgz7bmonstant velocity. Make a statement concerning its acceleratiozxg7mz (7l yq.u:md7ksz8gt zg jb+65n.

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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, does it mean that the acre a z0u,2qz6b52j/k. b mcoysceleration is zero? S5z. /a2k6q0, rsjb b2ey cmuzoupport your answer with 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 when its acceleration is constanj( )as ychf*ya:lm.7nt? Support your s:l*m7yha)cy.afj( nanswer with an example.

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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 constant acceleration. Make a statementmd,s2 :mbi* v7l )gdne co)dbvgi2ls*7 em: d m,nncerning 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 while its a4pkz1ax )q)cx6i 0ofd cceleration is decreasing? Support your a6ki oq ))z0xf paxd14cnswer 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 o6jmjhvo 5; wxd os(l6d5aeg2 3f ice. Make ;od 2hw g6oe(jdlvs65mjx5a 3a statement 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 average velocity equal to)p3iuij(zq5 8 k im1zg the average of the object's initialmz3zijq pk 1gi8u5(i) 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 ra pg fu:4bi zp-j9r6e,qh-l5w rte. However, object A accelerates for twice the time as object B. What is tpbzpl,-5 f wu:-erj rqi 9h64ghe 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. They bo -8xfx6iyn.xbe3 )dboth accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A comp6fix3)d- xbo8xn.b ey ared 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 rele ekc4h/*cb wrbu;a1(1pt+ qk+wdxqo5 ased from rest and falls in the absence of friction, which of the folkh 5 (uw*tq1bc+ok/pqr;4awbc ex 1 +dlowing is true concerning its motion?

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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,*n-g )fsgxeht ,(s1+,rikq as;+u( yiz e fq,r which of the folli +h*gr-n as,f, rqu)sfi+xs ((ey;ezgkt,1q owing 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 statemen7-eyffnp5 wmd;5l - hst about the velocity and the acceleration when thhfd snl;5we7 m--p fy5e 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 b+n,m1msh *xx, q8ab nacceleration just before it reaches its highesaqb, *+1b8nhxms,m n xt point?

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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 straight up, reacpzcil0 ;x)teggx6go5 g /2/rohes a maximum height, then falls to its initial height. Make a g/eg)p6 o/ gt;izc25xo0gxlr statement about the direction of the velocity and acceleration as the ball 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 up, reaches a maximum height, then fallsy h)gno v1+dto4fl45b to its initial height. Make a statement about the direction of the velocity and acceleration as theold hy 44+v)got15fbn 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 the absency+hbg kp*fe * x rbg0882zt/vue of air resistance. Make a statement concerning its acc/+ *zh0g 2bygupfe*t 8rvbxk8eleration.

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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 from y. o4ml+ly)mu +fj vs8n94s l6*yqmqha high-flying plane. What is her acceleration when she she reaches terminal vyfy+lo ln v4sqmlyh+suq89m .)6 *4jmelocity?

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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 up 2ft;d8tb.b2y ba1 koc2 o +ge9nkla6kward with a speed v. An identical second ball is thrown upnklatd;+y 6 9kbfbo t222oab ek gc.81ward 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 ball?)

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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 lad6 / zydabu fo:;b1*mater, ball B is dropped from the same building. As time progreob ;za1d*fbuyma6 /: dsses, the distance 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 second later,b8adv)5 bpj1)x;m6 r xe-7 mqucvyjm/ ball B is dropped from the same building. As time progresses, the differc71 uj/ -m;6) pd vme5mxryq v8jaxbb)ence 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 thrown up, and i*) spz*xv dh86bgu3s the other is thrown down, both with the same initial speed. What are their speeds when they hit zpisd 6)sh3u**b xv8 gthe 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 strac*liy;o9.*i,jc yaq xight down from the same building. They are released at the same time. Neglect air resistance. Compare the i*ycyix*j9l o,q c. a;accelerations of 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 +-r 0 cv)ijfsfp+ru(n9+8st sax axis. The position versus time graph of ttrcf+-)a isspn9 fru(j+vs 80his object 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 constant non-zero acceleration in the +l-32coqh7jbf x axis. The position versus time graph of this-2hoqbf j3c7l 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 constant non-zero velocity in the +x axis. oq47a g* v,szwThe velocity versus ws za7qov,4 g*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.nl .icke;n hj)4zi.v-zero acceleration in the +x axis. The velocvkh.ne.i ) i .cjlzn4;ity versus time 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 tr 81rl4 leo oc3qp7)qsime graph 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 versus tik5 tx4. 4ecogwme 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 versus tvf,y* yihgl 5r6e/ 7ams z2u;lime 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 in a velocity versus time gn:y,s7hyr f6b;ixgs2 qsdv ))y5z++ ep0 rh rbraph 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 od/bu5-b qcc15w- klvof an object is a horizontal line, the object ocwul5 bqk- vbc 5-/1dis

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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 verticalxvdme+kd n) xk,m uo )-x-5y:b line, the object is+bk,x :ddk -ovxm )e5yun)m-x

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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 graph of an4tc2 vz( 5jv+md7/tznwc9i sv object is a horizontal line, the object is scz4ct5 7di2zmj/w+v 9nt v(v

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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 k l7yhio* a4ta btcr 7f+f5u-8time graph of an object is a straight line making an angle of 30 degrees with the time axita 75*lu -4f+r ycb7 taihf8kos, the 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 then 11.0 m south. Find both the distancb bvm05 nnx)tm/kn(sm)hd 28 re traveled and the magnitude of the displacement veb x/tkb085 nmmsh(r)m2vn nd)ctor.

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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 warex,c+6 j/,qolprc- qter. How long will it take to move 12 km upstream in a river flowing 6.0 km/h?joqq+,c ,-/pcrx6 l er

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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? (1vliz,je ww e lep:n52j49xerd5x9 /)c 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 average speed in order b.kpdm 4o2sg3to 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 2 hours a( k. aqovxzp6:nd 57 min. What is the average speed of ta vo:xk6(p .zqhe 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 doe d 55mllea)ifq4m 9m/bs 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 that light trata):k2,hazjbj et (x-vels in one year. The speed of light is 3.00 x 108 m/s. How many miles are there in a lyj:a)2t-( zktx a,bjhe ? (1 mi = 1609 m, 1 yr = 365 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 straight road and you look tooxtqq3 e+( ux6 the side for 4.0 s, how far do you travel+ q(6equto xx3 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 track (400 m), in 100 s, your avek1ni kly4z..j ragein.l1.4kyzkj velocity 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 km 6*/d ysytx9+9xt nmzj south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip tzs+tdx/9 nm x96 jyty*akes 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 North Pole. It travels 1.cdpfph+f2/88 d b;xa q0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to8x8b2/dpda +pqf;hf c 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 weekend from school at 55 mi/h for 110 miles. ;/hk foxost) ut r.h)9It then starts to snow and you slow to 35r /fhu)sth )9o;t.xko mi/h. You arrive home after driving 4 hours and 15 minutes. 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 :hho,apa .c-h km at 100 km/h. What is the average spee,hp ao :ca-h.hd of the motorist for this trip?

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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 swn;hp z7;j9m 100 km/h. What is her average speed for the ; pz7 9h;jwnsmtrip?

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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 focik.71+s dzywx 2kdv +r 2.00 h and then at 250 mi/h north for 750 miles. What is the average speed for the tdx yick1vd+w7ks2+. zrip?

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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 anq4tbdzeek6k-hqk x5ey 6 2(m 9chorman (the person who runs the last 100 m) for team A can run 100 m in 9.qq k 6-2bxkhzy emdke9 et654(8 s. His rival, the anchorman for team B, can cover 100 m in 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 uniform11xje57vxki/d01yzml.y o zrq b6te6 ly and comes to a stop after 10 s. The car's average velocity during deceleration was 50 km/h. What was the car's deceleration while slowing dowq 1vj z/bt 1mrzyle7y.66 i0ekdxo1x5 n?

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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 to 160 m/s, at the ave8q/ l)fxu4a2xg3;lwjp8hgo f r1 mha(rage rate of a(fxwox8 1/jmplf8 ;ugh r l 32ahg)q4$15 \; m/s^2$. 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 kziomj 2fe(pmkx96 5 j;m/h accelerates at 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 accelss0n-ef 7s dt m.4tg 5nqvt+l*erates 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 withiq,ec p: p;o2d a constant acceleration d; pc:iop,2q eof $2.0 \; m/s^2$ 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 experi slr0:.(o7xb; ;( kjzhowwuimences a constant acceleration of j.0zhw;(ior bu s7k(mwxl: ;o$2.0 \; m/s^2$. 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 horizo a,fp2pvrq db4s08 1jjntally to the right (+x direction) with a speed of 500 m/s strikes a sandbag and penetrates a distance of 14fd s1j j0rq8pv,2pba0.0 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 kns)4jw esp.f /i,8ui ;+qhqion an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleraq8uw ni+s;pfhij/4i.q e, sk)tion is constant, what 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 with cons q*vb*mhk. hz y7e5z8ptant 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 avep5 d,tcjr62 pfrage accelerat jfr,256d pcption?

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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 the f22w9vz6clc 4 xbdcg8o4d k d-yirst second it travels 5.0 m. How far will it traveld-o4 z6kv 2d 924cygwdclcx8 b 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 st8z1wm1* fq;s cq6pa b:fpiz.e raight line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move bi6a s.fz 1p cq1 q;8:mefzp*wduring 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 accelerategb (9-xr- o 6/ d1t*mfohihtsvs 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 roov4w:df* +;+u:funuentp ) b11mg tnq ad can decelerate 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 tuk12 y,m7: r ncjzj-mghx/bbg5rns green, a car that has been waiting at the intersection- / mgzn5:g12kj,7bb jrhmcxy starts ahead with 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 m/s on the surface of plsf0x:m x h2km2anet X whe2kxf2x0 m:hsm re the acceleration due to gravity is $1.5 \; m/s^2$. 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 they6j97b laz:id d5c7n h surface of planet X where the acceleration due 7alb96 5n7 cydj zih:dto 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 uphpebwi.i(6h4 zd r5 )pward with a speed of 15 m/s on the surface of planet X where the acceleration due to gravppbiri4ew 5)hd6z( h.ity 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 speed of 14 m/s on the surface of planetx-t4bv : )+vlw*gz oao osd97w X whewx o ov)vdw79s*la 4bgtoz+:-re the acceleration 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 usually greater than 0.10 s. If your friend holds a ruleux25 vtujh2j 0 wqqfaan((m;k d9,,u br between your fingers and releases it without wau kuq2aun( a,h2tb, jq 0x(wfjvdm;59rning, 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. What is itg4gprd ozq-++r1k9 ncs velocity after 3.00 sd+r1r go-+q znk4p9 gc?

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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 starting point in 10 s. What is t)scz n8i1jl p+f(1gx rhe in(1z lj+nr) pcxigf1s8 itial speed of the bullet?

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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(r8wge8 0pn vo to return to its rwevo8gn 08(pstarting 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 downwarrumi h-74cy y.gizc 8+d from the top of a building with an initial speed of 25 m/s. It strikes the ground a-hyucc 7. 4giyi 8zrm+fter 2.0 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. (only fill in numerical 1 x r-fqqsxzg0v g 2gzyrp 52jl..jl(.s5hwv1value in the-r(zzfsq 2.yhv5rgl.q.j1x51gvxsl 2p gj0w blanks)
(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 air with a speed of 30.0 m/s. (only fil8dc r;n9h/uq h;i9o bflur9 h/ oiqf;9 ;hbd8nc in numerical 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 velocity at t = 1.0uil( 4j aoid/) 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 thtktbny1 b)ha1i.-1 lzfj z n o7go1h9.e velocity at 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 velocity at 5v fmft73)wp*kq;lq 46umdgh 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 velocity at x.hc0j+o ya5)ywi eqm55rc2 l 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 velocit m.r6up3;hlffy 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 averagek 1muu(n1o4) )e2ub w qdnu8yh velocity from 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 t ly8 j .ri4k8pb0zp0 wsduz/4yhe acceleration 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 the acceleration at 3.0 s?-x*w3riiy33f1usf 2nx v *l ,c*qipet


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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 acceldv(dez*ppo7nxlo) 3db rq7-; :mtrc5eration from 0 to 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 averagss8)fze 6n .,plcop u8e acceleration 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 from 0 to 8.0 sj. g)dh 1soj)b?


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