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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: 游客未登录  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. Make a com: ndd aw*vx(zbx4.6wc parison between the displacement and a6:* cxxd. bndzwv (w4the 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 object equa:m 5 sl1;p 9lyy1 cq(h/olcxgii c, (lmv:7vjgl 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 that their car can go -ml.jwnc3sio( 1g.sc"from zero to sixty in 8 s". Th.-c.mcn1sgwsol 3 (ijis 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 azrk6a 8sdky- 6cceleration 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 i-)37ssu 1a5pjwfury rg0+n nthe East (+x direction) begins to slow down as it approaches a traffic light. Make a statemeny1 n7nauu i rs+r30w)gj-sp5ft 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 t.8 1 ,uhkjzygvhe West (-x direction) begins to slow down as it approaches a traffic light. Make a statement coj 8vh1k uzgy.,ncerning 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 wb2qox sv-- sx j12oc5a statement concerning its ac1ox w-csq2 b-jsv 2xo5celeration.

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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 objec6 9/wb. vfwwwft is zero, does it mean that the acceleration is zero? Support your answer with an exam/fw 9w6 v.wbfwple.

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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 accel)a1deu fiz;m1ku 29c yeration is constant? Support your answer wcy;e9z2u fa 11uk idm)ith 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 ack84acsev,4ba, svcy 8celeration. Make a statement concerning its motion with respect te8v ,cays8s4v ca ,4kbo 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 accelertp9o2,4vq);y w lls+pw bzic(f- 8jqxation is decreasing? Support youxtwq)( +szw2;j pc9-lioqflpb vy4,8r 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, movq8)*vealx8 ewes up along a smooth hill of ice. Make a statemvwe exl8q8) *aent 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 isl/ ,* 94ftscskrl(xt-09fnupk vrl *u average velocity equal to the average of the object's initial and final ks-lrpx *(tuc,ffnlk/* 90l9 4 vurstvelocity?

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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 i,d g9 ;;rkaqhrate. However, object ;r,9id ;qgka hA 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 rlq0v22(5jsh* mu bwfkest. They both accelerate at the same rate. However, object A accelerates for twice the sk( m*5 0 uqvl2j2fhbwtime 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 released from rest and falls in the absence of fricti7 qjqaa)rbj.u86 cdf-tt k) 9pcy+r1jon, which of the following is true concerning r) uj78 rq t6)apj9by1at.fj+ck -cqdits 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 fromc r:2(ta1p. mwmf xm6q rest and falls in the absence of friction, which of the qxa 1f: wr6pmm2.(mct 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 straigm y0 u0jiq50 d(jnzld;q,/0g+acax giht up. Make a statement about the velocity and the acceleration when the ball reaches the highest poij0 +d5ax0gid lqu/;0nm jgq0 ,(zc iyant.

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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 th)ptraa 1a9( q xz*,zegrown straight up. What is its acceleration just before it reaches its hiaaz ( *txeg1p),9aqz rghest 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 g-zt-,q x oyhh (v:y()swe: kz3/s coiheight, then falls to its initial height. Make a statement about the direction of tzvi s(3(,-hogxtk: -/o z cqyw) :seyhhe 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 falls t emqk7b)do7 b hj)df-*--d ooq+rq.l bo its initial height. Make a statement about the direction of the velocity and acceleration as the ball is coming ddd ldo )qqoqhbbm ) -kf -o+b-j7re7*.own.

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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 absence of air resv/ :xtaxv((w b()lleqistance. Make a statemew()beta( /(vlvq:lxx nt concerning 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 jumpsnhz9gnnw 40 83xfndi: from a high-flying plane. What is her acceleration when she she reaches terminal velocx znw 4d8f9:0h 3ningnity?

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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. An idenn.aj tn4 ):prsgjc+u22s m tv3tical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maxic .)jr:tv3uatm4j 2s+p2ns ngmum 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 dr9.cdej sy 2o/ gxw.yt:opped from t. twco.2y/gex:j9dyshe same building. 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 9e wta/nal;.7 0imxwy a building. One second later, ball B is dropped from the same building. As time progresses, the difference in their speedsn aw iwmetl/y7xa0.9;

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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 u,e gywe0g8j-f1 y7wd zno/v0 cp, and the other is thrown down, botcny y, -ow1edvfje00 w8/7 gzgh 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 bricjh7i0-, oukd ;k)wy vdk is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Comd0d-hw7oij ; ),ukvk ypare 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 with constant non-zero vy)t1rox4p;87 9ro cr9xqbk ofelocity in the +x axis. The position versus time graph of this otofr)1 bo47r8 9c;kpo xx9yrqbject 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 x 54tu;ukff16ns/pkawith constant non-zero acceleration in the +x axis. The position versus time graph of this objecfnf /tp4 u;1ku5x6askt 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 cons8:pt4wfofn hu e y,d1n(.nhw; tant non-zero velocity in the +x axis. The velocity versus time gra ;wf4dt1(pnu:. wnf 8yehohn ,ph 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. The v*vy0fnm , vez1elocitfvmven*0, yz1 y 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 positioq6v+jzy ps93u5t lo )dn versus time 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 velocitwjeq /h5-lg ky2aw x*.y versus 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 ac5e-r7qool p5f,(h cjth(x 0kxceleration 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 velocity versusqg*-*m2u wx56n77 d6b k e n-cs)yuo*zkcnpj n 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- 9 qxz0yifjw8 horizontal line, the object is jyi8w xz9q-f0

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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 timekn dp/fq+3+;gh4*(xrohtcip0wf /lw graph of an object is a vertical line, the object isd0w wp/khh3;n/x +qp c4rfi*go(lf t +

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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 graphuv9f j1) m,fu2d q6plo of an object is a horizontal line, the object is v u)6o1fqu9, fmjpld2

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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 straight line mak7 (jaii3sb2 rntgmrah.f02:qing an angle of 30 degrees with the time axis, the objectg.ri70a n irhqja2f2:t(bsm 3 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 sou )odicx-o x7 k5m0kc *c;f6evhth. Find both the distance traveled and the magnitude of c57kxc ovc) 0imhx6ek o;-df* 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 30 km/h in still water. How long wilv j/- 68y 5uv;cfxozewl it take to move 12 km upstream in a river flowing 6.0 kyo jwcv-v;58e6 fu/ xzm/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? (1 mi v8wa62ux h yq.= 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 travel 3505cn3 :mdxkv)o 4;qcxl 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 marat x stafsdl.ko-w.j/x2-y 2)tthon (approximately 42.0 km) in 2 hours and 57 min. What is the averagex)/ x-2ajftyosl t .2w-tk.ds 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 does it take for it to traveltnyu-;w(. y yp 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 travels in one year.d* / p-qfrm:3o4e/adrgz ar*es4gv7v The speed of light is 3aer /ro/4vd q :gm v gp7a*z4e*s3drf-.00 x 108 m/s. 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 y5s4 2qpab we0a straight road and you look to the side for 4.0 s, how far do you travel during thiqw5e 40bp2 syas 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 lm+s q, h0+q8v+fg/mbp- 9qgp y :fflym), in 100 s, your average velocityb+-qfl+ 0f 9 hpyf:s,mymggqvl+ 8p/q 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 s4e4qmackr88- p qo ha7outh, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the beekq cm487 -ap4hqaor 8ar'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.xwh ; pkw-2z;d0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bear's azxhw pwk;;2 -dverage 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. Iiq2,u co m guab.ls .,1ha(2fit then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far m(2,1ua,g2.fc ii usqob.l hais 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 anfn6f:t,vt.5 9r lfzg,fwvh2hd 160 km at 100 km/h. What is the average speed of the motor 695fftnh v. f:gvlf, ,thz2wrist 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. +ccamm2p ,j+w0 h at 80 km/h and 2.0 h at 100 km/h. What is her average spmm ,c2+w+pjcaeed 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 and then at 250 m eg 2 2(e1imartj1ga/vi/h north for 750 ej2(1ta m ag21rge i/vmiles. 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 anchosfc*bqae v3cige646xv; 9g xe( /5y kqrman (the person who runs the last 100 m) for team A cania9e5q v/q sxgk*6;c3vxe 4 c6f(yegb 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 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 and comes to a stop after 10fx ,y-1vzf.k b s. The car's average velocity during deceleration was 50 km/h. What was the car's fv1b-f yk. x,zdeceleration 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 speedr 8rm ke/ca2.p qllzgpleo d+7)4 6n3l from 100 m/s to 160 m/s, at the average rate of er+qnrcm7 p4l. l3z/al g6odk)p 8le2 $15 \; m/s^2$. 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 kp.ck 3 ;ga bvnfgm,/a6m/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 resctkn20 v.mp0) 1zg p bhthm:g9t and 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 speeds up withsccuqh r0p 59bqjc5r i800u3c a constant acceleration o0uq0r 5i3qcj uc0rs8c9hcb5 pf $2.0 \; m/s^2$ 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 sv)fd: o(jji3experiences a constant acceleration ooj j(3v:i s)dff $2.0 \; m/s^2$. 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 directi rcgvyj h5xife c/h+b/m2rf(6b3 4 *pyon) with a speed of 500 m/s strikes a sandbag and penetrates a distance of 10.0 cm.6( 2r3 b*hfym+g i5xfj4 he/r cvb/pcy 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 :;bbzvli+ how6 , 0hd-t xfuk(catapult on 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 acceleration is constant, what is the lez- ;hbkw+liv du0ho,tf(6xb :ngth 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 mov l25amdijkt2u.j sg;9 es with 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. W80ct wbd jm qn2gf4z bd3y89,sf9 )xrghat is its average acyx9r d )2tfqmb8w d03jg4s bg c8nzf,9celeration?

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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. D8e m3(3lkph lxuring the first second it travels 5.0 m. How far will it travel during the thie xlk8 l3(pm3hrd 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 acceleration. Initially5h) +i)l k.ebpv4scss it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. ihvs4 p+5)ck) se.sb l 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 reszs(f0 ia pe0-st and accelerates 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 decelerate at byxb545k1zmz5+pv 0bq,t y)(f ruvhcex/j y / 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 b;y/ 2o 0jqdxqb8la4 kgeen waiting at the intersection starts ahead with a cj ;a820q gqbo dxky/4lonstant 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 -.3pofz dxx20cv gh52tounh6 a speed of 12 m/s on the surface of planet X whe op53nxudthg0o6h-v.2 2 xcfzre 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 withwjt 4s qow*zik x.sc:x8a9*1b a speed of 12 m/s on the surface of planet X where the accelerationsx 1 94c zkotixsa:.*q8bwjw* 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 with a speed of 15 m/s on the surface of planet X whedn 9ljr q,i5 u,c 7*v5fn0hfnvre the acceleratiojnnr9dn*lu57cv 0f ,hvfq,i 5 n due to 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 14 m/s on tsbn1vkpk4 8 2ahe surface of planet X where the ksa48pn12kbv 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 t dd9x8s2oppbd.z whycbuvk/ )q ::62nhan 0.10 s. If your friend holds a ruler between your fingers and releases it witd :dno89x 2ppqb6z. ) s: bwd/vy2chkuhout 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 velocitymr ;ix; a,bu(u of 19.6 m/s. What is its velocity after 3.00miu(a;;b ,rxu 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. Whax tf*kn 5ff b+e4r,s,qt is the initial speed of the bul sr*f5, k+xb nfqf,te4let?

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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 o+uajcpzk*24jw; lei,uy( ii .f 36.0 m/s. How long does it take to return to its startiwj,p . ciau*4i(lz+ui;y j2ek ng 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 ofp/hq :p+*s9u.ee d*lyn sc xn; a building with an initial speed of 25 m/s. It strik.ds+hns9l :/p* p cxeny* ;qeues the ground after 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 axq3/ o,enw6efr39; yos:g f ozd ia39s:nsu c2 speed of 30 m/s. (only fill in numerical value i zfof adw:s9i:n6sno, s re/g2u3qy3o;x 9ce3n 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 the air with a speed ofww,2 bj 97es1rae*204zpakw1g q spye 30.0 m/s. (only fill in numerical value in the kyg aea*1r pq0w 4ej1zbs 92p7we2sw,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 9n2 js 3:sw rsyws y0ny2g5jr2velocity 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 tslj z3jpo9t7y-gs.zi4 ((i j lhe 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 t =w6f 0 wka ucasjw1m) o6w6y4h2 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 t = 5.5 :9c:xgjrk xb 5s?


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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 velocity9 sln.f,ky4iy 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 to cl jqjr,ikq9frr:7ok-+t.tky ,n7/q6.0 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 acceleration at 1.0lqc)s6q( imx k2+2o be 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 accelerj tpkf b95syq1z3 zd/a5ny,o2ation 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 accelera3: ihf)d,1sl u7ns *x cac;dintion 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.b aa6:m.qg di 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 fro x 3eyx0l 5sda-n/8ufxm 0 to 8.0 s?


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