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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 anothu 4iot9,fco g, l1dys3er. Make a comparison between the displacement and the distanc,t14 oou9ldy g3c sf,ie 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 instai n-,)7jv tf tb8fnil;ntaneous 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 "from zero to sixty i(u96 zdj2xup;za t2e rn 8 s". Tz 2azpx9 (rj;6eud tu2his 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 tkh0ar2 3ob-h ht14k4b) 0xctj(er ;jh/cvtgj he +x 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 Eas0 3s;uh r8bp .*f,:ggufknfwrt (+x direction) begins to slow down as it approaches a traffic light. Make a statem 8wghfn :*,fpbfgruk0s;ur .3ent 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 to slow down as +0a8k kvqrpmpf ;o;f;fw,4 ddit approaches a traffic light. Make a statement concevpfm oq+8 k,pkwd;f;0adr4f;rning 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 fgp5 q8gpkcctf9 s77 ef- i;3w6ei +bewith a constant velocity. Make a statement concerning its accelerationbps kf;68e9 3pf7+ ccwe-ie5 f7gtgiq .

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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 tubjqyb6lcb,/ n;f /4 uxswy./1 mhw0b hat the acceleration is zero? Su4wmwu0,j6 ubnb sb/h/qb1 f/cy.yl x;pport 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 ,ua 4ma9w)ut tis constant? Support your answer withwu,t mau4a) t9 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 statemenbc 0u kt+r*x7wt concerning its motion witcx +bw7ktr 0u*h 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 acceleration2q1;om.v kj/eoq nne- fr;w+v is decreasing? Support your an; /ovm2wqn;. kreo1q- vjn ef+swer 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. .mnussp0 v8. yMake a statement concerning ypss8 u0m ..vnits 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 equi: /e9dk o3mdjz0)xip al to the average of the object's initial and final velocij:pd)d 0ixi/ze k9mo3ty?

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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 /v;-hi/ig w3d)lroigstart at rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object Av) i l/i/;w diho3g-rg 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 same gma2fjs5,r.fn-ho :y rate. However, object A accelerates for twic5-rn ma fs2gjo.h,fy:e 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 released from rempl3c prbq q,9r);d 5sst and falls in the absence of friction, which);3s, ql pb95q rdpmrc of the following 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 tuhrca hhp8 zj;09,f;fhe absence of friction, which of the following is true concerrha hcu; 8phf;f0 zj,9ning 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. +qahd stiwu1 3d2r1(nMake a statement about the velocity and the acceleration when the ball reaches the highesh+n12iqwdt3 dasr u1(t 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 1pnfwmg) ai*7straight up. What is its acceleration just before it reaches its highest point)pm*1ag7f w ni?

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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 thro-j j(ihx lyr34wn straight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity anhj(-r3x 4y jild 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 fal- y/b)bmrmuc7nm* jp94 hs-stls to its initial height. 4 pus)ht/byrbs9m7j n-* mmc-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 thwv3h;dleji x :xdc qs(--40tge absence of air resistance. Make a statement concernindecw :s4 gvti h 0d--;xlx(qj3g 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 high-flyingdm)0pnjy 0. fyle.m) w plane. What is her acceleration when she she rd.y l ymn0))f.pj0wm eeaches 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 a speed v. An identical second ball i;uzg5l8www y+9uo * ots thrown upward with a spee wylwgot;z+ 58u *u9owd 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,94xn2eoi+ettey ck 8 building. One second later, ball B is dropped from the same building. As time prtxoe y, e2ck8e4+t9inogresses, 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 bun g 1))st8g5i3eqjw xnilding. One second later, ball B is dropped from the same building. As time progresses, the diffx5qntgijs81ge wn ) 3)erence 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 tallh2m,(hs asq cf9. x/po building. One is thrown up, and the other is thrown down, bs(ca smh/hfqxo,p 92.oth 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 secon8+02 p rbnrl j/;dvlzld brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the ljnp0l2r+d 8;/ vzrlbaccelerations 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 vybb5 /8:z;b7argt-xdc yj nc .cjj(+with constant non-zero velocity in the +x axis. The position versus time grcj/gc;yt - cbjnz7b:bv+ x.d ( yaj58raph of 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 conjd/; szdm))rpn dg6 r;iy4n5bstant non-zero acceleration in the +x axis. The position versus timed)r 6ygd4 n /mb)zi;spn5dj; r 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 velociaew,3:u4e u-bjy.e vqty in the +x axis. The velocity versbu.uey,evae q j:4w- 3us 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 7sutd,wf6sfu v /h9) mthe +x axis. The velocity versus time gra u6wt)fvsm7 u9fshd, /ph 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 g3uzn 3)uh( 9ddt6hff 7s*yyni kl-ao6raph 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 4 yz,tx(wqx( wi5oky. 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 acce(z hrw;)d.mm uw0yopg08tai183 m yyeleration 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 versus time2hdt mvx;4: yc 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 grar-7xzs-4zy k bph of an object is a horizontal line, the object 4y xz7-bks rz-is

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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 timm) 1 7wo,wzpicib+eu,e graph of an object is a vertical line, the object ispi)mwue 1z7b icow+,,

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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 object is a horizontal lin vx4j1g(dc o3ke, the object cv3 1gox kj4d(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 objecpr khg)ev/r1pi g8)z6wyy+2 ct is a straight line making an angle of 30 degrees with the time axiwpr2vr1+c )hig8g /z ye 6)ypks, 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 u:()alh vf8vd south. Find both the distance traveled ana fh(8uv:l d)vd 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 30 km/h i0abqvc3/c )l yo 1)hdx(. 8z:dnav maq6vff 8cn still water. How long will it take to move 12 km upstream in a river flowing 6.0 k6aq mc zq8fh:b/(vv1d8x d) c n)a0olcf.v 3aym/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 m7 ia kfm6p.h;ci = 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 averpdg 2*mwbyja 7ocke9 +;g;r au,* :vlsage 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 maragso uogl l/mi7+iz85 (o vk:2rt.k1p dthon (approximately 42.0 km) in 2 hours and 57 min. What is the average speed of the runner2gotiskvp:(l o +d8zli7u gmkor5./1 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 trave2t/ mex1hsv8 q1y y*mprr/r9 bl 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 yeara 4,xy:9+ rodvjhlp9t. The speed of light is 3.004h:d 9j,rvl y9+ poxat 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/xr3uj uwle1 //h along a straight road and you look to the side for 4.0 s, how far do you travel during this in3lx1/u ewj /ruattentive 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 avehm.y .xcg-ayl1i *1pirage ve 1hcmi.l.y-y g 1pi*axlocity 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 travelz.ksg) /pc:fm s 1.0 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 k:gmc.f/z sp) 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 1.0 km south, then 1.0 km easous op:c5b9h ed (v(z p:i;so9t, then 1.0 km north, then 1.0 km 5s9i( heopp::d(zscv;ob u9owest 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 i z:yy:vdi9g7/ s.ngemi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive hyin /79:gd gi:zyevs.ome 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 km at 100 km/h. What is the averag wb9grxgn(pxh9b, qi36 i23pv e speed of the motorn93hb6iv, (rxi2w qxg p9g3pb ist 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. Wh9c35dc a* njkfat is her average speed f93cn ka*5fjc dor 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 n4)y(ma fld mcs.p5(ki/h north for 750 miles. What is the average speed for k4cpyn(s.(5)ladm fm 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 3e 0,cp4y6mb(hweb)kj f8jppzsqm7. (the person who runs the last 100 m) for team A can run 100 m in 9.8 s. His ricje3mkbsw7yjfqp(z486b) m pe .,hp 0val, 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 10 s. The car's aver 3 fqdc, 1ddnjvr-,,esage velocity during deceleration was 50 km/h. What was the car',dsvjnrcq fed,-,d 31s 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 to 160 m/s, at the average r o9uu; 86g 4xaxck1ndtate of kx n;c4to8x1agd uu96$15 \; m/s^2$. 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 accelerateokvkj;0p/ v1o s 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 a xekwl-1x: n2ynd 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 with a constant accelm;t+8tv5x. f,zhnauhuqee 73eration of uqae5fx t 7ne hzu.h,+3v8;tm$2.0 \; m/s^2$ 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 experiences a conscecx99y sq0 sr6:tp 9etant acceleration of 9t sps6 eryxce:9q 09c$2.0 \; m/s^2$. 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 direction)vwo43./vm9bvvh qyb3 w3d;v n with a speed of 500 m/s strikes a sandbag and penetrates a distance of 1 9/vw ;mq3hv4ybwvd 3v3von b.0.0 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 catapul4 5yys.:gmbctt 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 length of the catapultyb.sy5c tm 4:g?

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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 constant accele-./v4 oh gip2acasvek4v cc+7ration 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 itcid/v ru/flnqp w fhi1 k+p-53t*v 69s its average acceleratl9duwnir* 65/tkv + pi1/f-ch3 q vpftion?

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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 v,t5xh wqjrg -s.ox,:the first second it travels 5.0 m. How far will itxjsr ovgxtw, qh,. -:5 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 accele.b63 wp,+ft09 7bobpvzuoh dgration. Initially it is traveling at 16 m/s. Three seconds later it h6vwogutz30 dp.p, b bo+b9f7is 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 accelerates uniformly at 5qp2bi3fz d .c$3.0 \; m/s^2$. 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 aboutrrul5- yt-;s v $5.0 \; m/s^2$ 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 waiw1ccfx2xtj8xwy 5 bb+- m g0(zting at the intersection starts ahwy -01g5cz+x (b 8ft2wxjxmbc ead 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 pla1nw2;bkgbhok +hyyan+6 p p ,:net X where the accelerpk:+n1 k6noy+ahgh2yb bpw, ;ation 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 k a2 hw*idxf a+x:f+e6a:ad+fnof.y(xf 47gv speed of 12 m/s on the surface of planet X where the acceleration duf7a4aaead6h: v+kdxf .g x y+(2x if*n+ffw:oe 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 plan7cl,oz3g v 6 (u sfzr/zu-fej7et X where the acceleog7-evfs uzf /63rz(u ,jlz7 cration 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 witldo-v iw;/jnnfr :(, sh a speed of 14 m/s on the surface of planet X whel or:dn ij,w/( -;fsnvre 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 ytek c3ab) +jy0fik7* xour friend holds a ruler betwejk0xbf3 ke+cia )*7 tyen your fingers 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. What is itsl8t.glf sh it)g:)tr,hco d9 / velocity after 3.0ll hsd:c8tt/. 9fg)t,riog ) h0 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 straig 96ju yxh;t *lnrnr1c0ht up returns to its starting point in 10 s. What is the initial speex tny* hr1 cul9jn60;rd 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 takeu6f5f*f:4j5c v tpp zis e rp8r4,: -xrwfmm*b to return to its starting pom r:r-fzvr *fmfwt:bc5 56*sf8 4pujeix 4,ppint?

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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 withnef./sy)c( e-2d q b urig7-ii an initial speed of 25 m/s. It strikes the ground after 2.0 s. How high is the buil-7bifr-)dy.( n ic2u/ isg eeqding?

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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/sdnh- xs lk.mm)pi*x5:. (only fill in numerical value in :)mxl *sik-pmdxh 5n. 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 ofx/ tqi u-vz odl-8znme82ty*) 30.0 m/s. (only fill in numerical valx)ezz*-q iy2t d/ m88nv-o tulue 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 d l9skfhiuwc9fs1+ + -velocity 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 at t =d q563/t kd8h an4rpw4 vgiw5y 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 vwcp 3a9 kw9 p4 lfuh p-uq3q-l50be*ivelocity 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 e6 ry+ge w n.d.7 fifkaic6:vx40yp6g velocity 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 from 0 to 4t7g y;:a-b cbeesx; /t.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 6.0kp;4oyvfvcs4 f j7 e.x7)e* mo 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 acceleratr gambo vtcd6n85+6qw) hg5 2eion 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 acceleration2 0eckgswm4e) 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 accelerati:zc2bg y*z2t r,bfop6on 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*7mh;8:2 pzlceh jp m3i9ytww 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 0wg5jbm t93wbo1-tw(w/t n g,r to 8.0 s?


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