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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 one point in space to another. r),bu vfz76ok rs fm7iqq(0h8 Make a comparison between the displacement and the di7z0 87rfo(rq6 i sm) qhvukfb,stance 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 ohi-4hmgrr /-jz8ahe 8 f an object 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 adv e n7if: .2nux;wz+zwoertises that their car can go "from zero to sixty in 8 s". This izwiz .: ofnn eu+;2x7ws 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 experienfhd:rbj +jp27,ulq( zces 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 s5l8k11 ue)i fwc4rgc direction) begins to slow down as it approaches a trafgcsil4 k w1c8eufr)5 1fic light. Make a statement 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 traveling to the West (-x direction) begins uicpi-qt mt6g 6y*: 6zto slow down as it approaches a traf qti yt66mi6- czgp*u:fic 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 constant velocity. Make a statementwisdx9ug 2 82m concerning its acceleratix92ig2d8w muson.

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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, h sjd5:qa:xdb)j :s9l does it mean that the acceleration is zero? ds:l)qj:a5x hb:jds9 Support 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 acceleratio0 47tt +tdgdctn is constant? Support your answer with an examtc ttd+7gt40dple.

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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 accelerae6b;*( eq7zpd/qauyc tion. Make a statement concerning it 6e(;*pauzqe7bd/cqy s 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 acceleration :zrs-kk 74b xyo5a2eu is decreasing? Support your answer rbkau5z 4oex ys-2k:7 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 kilfe3pd k *l;e +q :thx),znto8 b87tvbck, moves up along a smooth hill of ice. Make a statement concerning its acceld f37ex*v , khb8 ;onzltelb+qt:)t8peration.

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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 ogxazg1*jj a:9+f: fa to the average of the object's initaoga:j*+g 91:f zaj xfial 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 bod emej-q.n s+,vw t) t37yyo+pth accelerate at the same rate. However, objec+ot qs3jn -+eve mwyt7).y,dpt A accelerates 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. They both accelerate at the s*y+c tm ay3r;bame rate. Howey a3bmrc;t*+yver, object A accelerates for twice the time as object B. What is the distance traveled by object A compared 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 releas5/-yg0qiwxt my 44b ejx 3zu5med from rest and falls in the absence of friction, which of the following is true concw5j i/54g4my3btuxzxeq-m 0yerning 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 absen,u5mo9 5hz)dh)ztpg t +dwjh-ce of friction, which of )5 o 9dthdzuz-hh,mj+wt)p5gthe 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 u.t nu d5-mpmij(12n hhp. Make a statement about the velocity and the acceleration when the ball reaches the highestp h2mnd t.-j u1hm(ni5 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. W. tdx tcdb+/,nqz4;mphat is its acceleration just before it reaccdpm+t 4.n/;xz,bdqthes its highest 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, reaches a maximum height, then fall+mq mm4 x),jpss to its initial height. Make a statement about the direction of the velocity and acceleration as the b+mxmjq)s ,p4m all 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,52v/ itelxmp; then falls to its initial height. Make a statement about the direction of the velocity and acceler5lt x2pe; v/imation 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 the sekb 4 v-dgiun3l(p v8vj, /c0absence of air resistance. Make a statement conceibsv0/3l(8-dj uen4v v kg c,prning its acceleration.

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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 a hij. it6fk 77vkhm)0zel,*hcp vgh-flying plane. What is her acceleration when she shpz*.6 vhvlj0c,7k m7feihtk) e reaches terminal velocity?

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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(4s qd l:-awgo a speed v. An identical second ball is thrdo4s wg(l:qa -own 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 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 later, ball B is 2cq1 0myploj13 s*bfw dropped from the same buildib*wyp 1c 1 qlm032josfng. As time progresses, 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. 96lvzx2u)ea)b 8xdwhfk, f , i One second later, ball B is dropped from the same buikh9l8fdiv , ,b u2zef)awx x)6lding. As time progresses, the difference 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, an pp 22wd65g0rm-ln)cyqfuzyo z547 kyd the other is thrown down, both with the same initial c-2mdp5027fuq gz)lno ry6 pwzy5 ky4speed. 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 .w xvu:d u /gud)jw:+/gh2hoa second brick is thrown straight down from the same building. They are releasdd: /u v/h:jw a2)hxwg.o+ugued at the same time. Neglect air resistance. Compare the 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 witha0q.cinn j5 y- constant non-zero velocity in the +x axis. The position versus time graph of anjyqn-0.ci5 this 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 constwy x:+rz*voz 9/yy2zjant non-zero acceleration in the +x axis. The position 2j zrxzyow+z*y:v /9 yversus time graph of 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 constant non-zero velocity in the +x anl6q g32q y7c-oicyl 2;i f3tun3xp k;xis. The velocity versus time grq iq c3;fy22ytx lc-o3nu3ngp li6k; 7aph 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. Thypp9 24i7vp qfh4+dh ee velocity versus time graph of this object ihp+vph4 ydp 9ei72qf4s

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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 gj0md8qp j9r.traph 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 time graph giv:y/ze32 br 1/kxn s5+d ou*icbokqx(ies

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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 accelera 5phqc,co) gr,tion versus 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 in a veloc40kbcd 4g9vrn2 p7j;gx:n lqwity 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 +il2gnoziv l.3bsh j.b1a .0i object is a horizontal line, the object iv+jznhs312bilgo.0a. ii. bl s

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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 verti-g sl0t nslo8/ (uzfo(j. kp1ncal line, the object iss(f0-8s1(g/tpzo llo. nuk nj

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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 an o9*aq.ce p1rjo -5vn lsbject is a horizontal line, the object iqc rpnosj. -a951 *levs

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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 is a skiap)4 q5g2i ztraight line making an angle of 30 degrees with the time axis, the objz 42gp )kqii5aect 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. Fy87 hy-+crtl kv0zl6w ind both the distance traveled aw0lkvyhl+yc7 z 6 8rt-nd the magnitude of the displacement 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 3 kblt:8 grb25rs x/j+d0 km/h in still water. How long will it take to move 12 km upstream in a river 5d sbr2+x gb8tl:rj/k 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 cy 2qk4*a9 zz.)botunyd +pz0m/s? (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 average speed in order to w3o/;rx 0ql +qmm)gl7 bq8gcw 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 and 57 min. Whccj3una rzo00a k)0/ yat is the average speed of the runner in0c3 ju) rc kya/0ozna0 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 does it take for it to travel 400 kx5l 9qpz zy5,dm?

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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 travels in one yeaimc- 7h walx9p4s9(nit 0 fjq9r. The speed of light is 3.00 x 108 m/s-ch9asq9jil 4 tm0n p(9w fi7x. How many miles are there in a ly? (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 s e ufmn1h9iy b9,4wb0yzis:ydx u; 82road and you look to the side for 4.0 s, how far do you travew;x,uh:m08bsbs d uy2eny49f zi9 iy1l 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 aver,jwzrfmrd4qjk3m 7/sv*w:hl l s9( i 8ag :/mvw l,k9ji rlz3wm7d8 s sjqr4(hf*e 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 south, then 1.0 aac zt e, r8zypj+(67ukm east, then 1.0 km north, then 1.0 km west to return to its starting point. 7 zy( rep a,8auzt6jc+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 North Pole. It f(c lov;wvwzvpk n)4n( q7.j; travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 kvfzv; (w74q.vn o(w)kcljn;pm 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 weekend from school at 55 mi/h y *7mx(t vfopt:xp82jfw2.lsfor 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours m* tv7 xos2 xtlyf28.w j:(pfpand 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 1f0tzfb ;2id6e;:fkup60 km at 80 km/h and 160 km at 100 km/h. What is the average speu;zf6 ;t2:kifbdf 0pe ed 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 100 km/h. What is her avery+teyx l- o)5xu1qejr(6d-p ei* 3oy qage speed for the trip1qt3eu-xd) pyey( ly+-5o e*xroq6ji?

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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 300k 8.)jvz 3u+xfrdhzuk.3 uv1u mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. What is the average szk .3uru u8)u j+1fz.dhv 3xvkpeed 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 anch ljh zwdckkz1:v sq*tmpa ) 61h-t03u.orman (the 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 10.1 s. What is the largest lead the team B runner can have when the team A *1p0thua6l kmdw1 qtzk 3.jv: h)c-szrunner 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 and comes - mxc22dx0kh: pbqn .sto a stop after 10 s. The car's average velocity during deceleration was 50 km/h. What was the car'.m pkxbn:2-q dcxs0h 2s 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 speeu76p x6rpr71vr. :j kdhmmya6d from 100 m/s to 160 m/s, at the average rate of myvkh6.1rj a66:7d7 xrum ppr$15 \; m/s^2$. 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 acc h4x 33un8z.h1i4arg) i/ gnm.e dmdgtelerates 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 andg-teff i/)7 jd accelerates 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 sdux-)itr+ ben 3 8t9wvpeeds up with a constant acceleration of 3-iu +wevxn rtt9)8bd$2.0 \; m/s^2$ 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 initial8my j(;ah-d kk velocity of 5.0 m/s experiences a constant acceleration of (k8- mdykh ja;$2.0 \; m/s^2$. 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 dikhy;q,o n4p:g rection) with a speed of 500 m/s strikes a sandbag and penetrates a distance of 10.0 cm. What is the average accelerationgy: ohpq4k n,;, 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 aircraft carrier. lp 418: yfbg phoym*5yIt reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is cons*ml8p ygyo1y4: fb p5htant, 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 constan .dfcvq( /ihqzi: qn-1t 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 )e(0-m zvop9 ywtwen8200 m. What is its average acc8pntyee w0- )zm( wov9eleration?

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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 accl ,c21 g*5kgl; noe8gu6vn qhot u5s+heleration. During the first second lo1 n ch,qhk 6g2gun*+tvelug o55;8s it travels 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 *aho6pdp2a9 .tw .s*z-ci r sz)9s entline with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does itzn.h pt2.i)*dw6 9r*soape- azs ts 9c 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 accelera8;8nvwe x,y8q4diyv4 v ht ii7tes 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 dece ah8hr3 +7i4rpqrth g.j0x xebm0j0w 8lerate 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 car that has been walzz,( (lau.dv iting at the intersect lau.v(z (l,dzion 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 surzjvzf28l l2-;ec wzp 1 aqg3s;face of planet X where epq 2l;;8c12 -awj zsz gl3fvzthe 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 1 om; u9jurrk aez v hnd0()5hx mvk4;h+n4a++m2 m/s on the surface of planet X where the acceleu)a0xmjn uh 5r9rkz(v4k++;d+hmn4hva eo;m ration 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 upward wit56kptbl-w rt) h a speed of 15 m/s on the surface of planet X where the acceleration due tb6k -tp)5l wrto gravity 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 14n4k rm4 adpa zpv3gu 5*-j.so. m/s on the surface of planet X where the acceleram4gu3ak pr dvza. *5ps n.o4j-tion 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. j w g660+y.pty,yb aoj If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall bef.yw0joygy atbj6 6+,pore 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. Whatpt9h* l jbp9i7k, dby3 is its velocity after 3. ib9j pk3l7t,b ph*y9d00 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 starting point in 10 s. pi .+luas8:2gakk l3 k What is the initial speed of the bu3l 2a8.kau:gkkpi ls+ llet?

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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. /qemxk/rz99 ascw8a 8tx8m l50 m/s. How long does it take to return to its stwe/mas9marqt z5lc 88xx98/karting 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 fromh- s, dtke9ge 79x)kyt the top of a building with an initial speed of 25 m/s. It strikes the ground after 2.0 s. How high is the,9 gtkyed-ks 9x)te7 h 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 h ) prnox;v iio;ae-ax;3,*ucm/s. (only fill in numerical value in c*;oi nr3a);vap,ixh;-oeux the 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 oml8 55ji8,npc7kdo sthe air with a speed of 30.0 m/s. (only fill in numerical 5cnp ls k8oi 85odj7m,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 = 1.0 m b2f- hnliwftm0(t+4 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 at t = 2.5 s?z3vd6bab. uz:;:msunix di,0


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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 t = i)w:(il vhxci4q8p)l4.0 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 1-le2yg: j7qdud ;eovzo sm+4t = 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 alum ),u :ni:0nxkthh( verage velocity 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 from 0 t5ly1 s9o -cwfxa hdxia6j25 p+o 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 /p52kbqpikf 2 the 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 awf,gda + 6smh7t 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 averagectavcds; : p2r95q nywv q4(h- acceleration 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 average ac 0w+ kqzz0f.r rkrfh,7celeration 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 displa:f meq2,lu yxn45 . zg0 ftxay9vb6ww5cement from 0 to 8.0 s?


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