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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 6 ,4(muyijann.jcl , xanother. Make a comparison between the displacement and the di6uy. ia,nj,lx( jmcn4 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 of an object equal to the instantaneo+th );r e-afyjn8 4vvaus 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 "fr,nrq82oimn-;aj 2boolv /wd. x51kxb om zero to sixty in 8 s". This is a x; /5ov2okwn.nq -bd81 oirm2lj,a b xdescription 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 experience tl7s)sfvbmih2 mq*)hxbq . eowt4 :;5s 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 travelin n(0zxj0ypv.rz0s2l ixq8 da 7t4 9earg to the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement conxatd0nvz7 a y9zjl 0i sxr4p8r2q0 (e.cerning its acceleration.

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that a car traveling to the West (-x direction) begins to slow d e w0 b4;zxrx3hywfd/5ix)inz3-.oloown as it approaches a traffic light. Make a statement concerning its a)r4izexo xl3o w0hx-/ wif.dznb53;y cceleration.

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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 movj skpk-fen0x, ,x; hj9ing with a constant velocity. Make a statement conce9kx ,ej-0;hpfj n,xs krning its acceleration.

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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 mxkzo8a4l3f3upl3j t n3hia4+ ean that the acceleration is zero? Support your answer with an examp8z4l3 an4fta3o h3xk+3iuj plle.

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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 constant?31h cbrj.- ;gt-lf rmr Support your answer with anlrh;gcjm-r r13t b.- f 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 ac,5rct +4 vbqz statement concerning its motion cqbc z rvt+54,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 is decreasingq ijb1cox. 6,3/;t;vfb zosqn? Support your ans6 ;.v1b i/tn ;xobjsoz,c qqf3wer 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. dx.h295bceur/ by td* Make a y brcdhbx9 e5.ut*/2dstatement 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 c36eazm3p,2is ;qk inthe average of the object's initial anicn 2 ;iz6ep,kq s33mad 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 startk nv92qggs;i)c))tvr+c5i we at rest. They both accelerate at the same rate. However, object A accelerates for twiceqi)cin +erg)g wvc k9v5s)2t ; 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 vus/ u z l7;-z/th9bicfrom rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance tv b7l/9c uiztz;s-uh /raveled 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 andvd3t 0cu9 owq+6-z myf falls in the absence of friction, which of the ffo3d-96qz tcv+u w 0ymollowing 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 ab (l 5v/p;ssf/sad izd9sence of friction, which s9 pz;sfv/d(sal/i5 d of the following is true concerning its motion?

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown straight up. Make a statement about the velo em5cmvx*u0axtz 7w5,city and tha,zmw ct 5ue xm7x5*0ve acceleration when the ball reaches the highest point.

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown straight pa c.+5,x2f;kteedhbd 0 i-v bup. What is its acceleration just before it reaches its higx5c. k v+df2 ati0pe hbed-,b;hest 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 mn-enoev 2ae.c .fz4j:aximum height, then falls to its initial height. Make a statement abo4c e2fzv:n e o.ajen-.ut 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 fala 2b9v md gr:eqz(0e)vap ;j3jls to its initial height. Make a statement about the direction of the velocity ap r;:ajvg( 0 v3)bemdzaj9eq2nd 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 the absence of air resistance. Makuy2+- +fz plqb5wpa/he a statement concerninglwyb+ 5 f/phaup+q2z- 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-flying plane. What is her accer qt ct*h77/peleration when she she reaches terminalc*t eh7q7/t rp 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 j6 i7 xh,l(kbnball is thrown upward with a speed 2v (twil6h 7x(knjb,ice 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 to4sm;nj,w(9 fxectc3leinc 5 . p of a building. One second later, ball B is dropped tj4c3 emcnxe;n i ,l.w9s5(fcfrom the 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 a building. One second later, ball B is dropxuud4 z8b- dtj)dru)8y5bs5s ped from the same building. As time progresses, the difference in thezyb5 rd dxt84 -)uu5 j)b8usdsir 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-brwyc 0d p1gq::grwk4 3gi huex0f:st-* u9rd the other is thrown down, both with the kgc0w-q1 0xbr hgprs4 i ugd-:f:ywtru93*e: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 t* ubwu2 u1m7vd *h,4 y4rwre -jgguqm1op of a building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of th1jmh17 wgvugqm *ur*y,u 4r bu42dw- ee two bricks.

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving with constant non-zero velocity in the +x axis. rn;i.o-hb. t *rz ff7wThe position versus t-; ro7rffbn*t. h.i wzime graph 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 constant non-zero accelerat2d k98 pt20qpds an1uv.tcys:ion in the +x axis. The position versus time graph of thtdd8 sp 0:yk 92q.a2cs1pnvutis 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 ikmj x0-1op jl3n the +x axis. The velocity versus time graph ox30m-lo kjjp 1f 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-zer . t3w5yv4byj b4z:teno acceleration in the +x axis. The velocity versus time graph of this obnbe jw45.3y 4tyvtb:zject 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 kr)q:t myeujg*: il3o 3*c*jm2 p b9iw-l6hpxgraph 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 gbh4wd /6zt at(ives

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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 acceleratioc-/-ir1r vckd:tg-pkav i6n0 n 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 time graq8p cc+bvoica,v2l65xo w i6 0ph 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)-t+l3+ rq;*spbfdr ykc .omv of an object is a horizontal line, the object r)tvl3fcsob.-d + m+p;rykq *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 time graph of an object isipr)5 xjhs 7k8 a vertical line, the object is8s 5 rhipxk7)j

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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 twpq:8f hsz.r bzhn+)nh2( (rf ime graph of an object is a horizontal line, the object qbhfr:pn(shw( 8 z+r zfn2h). 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 oe-uo2: igtg+object is a straight line making an angle of 30 degrees with the time axis, the objectooe-ig2 gt+u: 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 s y(mlx:h v/kc .rdi;6routh. Find both the distance traveled and the magnitude of the dism/xry(6: i.krv;dhl cplacement 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 lonlt6f/amu eq *-g will it take to move 12 km upstream in a river flowing 6.0 kmql efuma* 6-/t/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? ()l 6t:/4 f tuf-uxxr:njba p4k1 mi = 1609 m)

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What must be your averag vrasohpy2 xj,k+d25hs2n+ u7cri0:x e speed in order to travel 350 km in 5.15 h?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A runner ran the marathon (apprps/o 1;ytyrodev(e- * oximately 42.0 km) in 2 hours and 57 min. What is the average speed of the runner r*edvy so p;eyo -1t/(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 taxl;eqhnzv84 yb/8ci1 2 lb em+ke 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 travels in one year. The speed r)f6vfbpwi83 of light is 3.00 x 108 m/s. How many miles are there infr v8i63b)pfw 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 8 th, d x1vd:r/*j,bgiao1h lou xfd34road and you look to the side for 4.0 s, how far do you travel during this inatten: jxutr*blg 1fad4 ovxhi1d,38hdo,/ tive 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 (1mizt. t3 dyv dt,8. i3+ytb9inn fi8o400 m), in 100 s, your average veloity vz.ti+38 nti3 89d.tnfom1,dbi ycity 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. Izjnup :1wz*y*t travels 1.0 km south, then 1.0 km east, tp zzy:nu* w*1jhen 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 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 j51z3bx n eh7 0cjrxe3sx*0ak the North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to s7jea5xz kx 3 br3*0h0x encj1its 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 fork:avzb5ob 8c ( 110 miles. It then starts to snow and you slow t:5 kcba(zo8bv o 35 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 hps(od;jj2 *u160 km at 100 km/h. What is the average speed of the motorist for (u s ;*hdpojj2this 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)r7ljaoxbik0 6nzh)7u 3;fju .0 h at 80 km/h and 2.0 h at 100 km/h. What is her averagb06)ohfaj n 7x3 z);iukjr7l ue speed for the trip?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h northup *c;tcl vo vpe-a2t)7cj)dsbz8.t + for 750 miles. What is the average speed for the tri*-tv vc c ) pa;zo+) pc8tu7b2ljes.tdp?

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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 anchor)whjut 1vsu3ltuck139 +6apl man (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 thk+1u6 slthctu391vj )p3wa u le 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 tomj dg3/hvtz vqm(cr; 32i w*1h a stop after 10 s. The car's average velocity during decelerv rmh2j z1q;*v3t(h cimw/g3dation was 50 km/h. What was the car's deceleration while slowing down?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane increases its speed from 100 m/s to 160 m/s, at the average rate o;ygzx((ao f8xxds 4:qf :o4 (8gx(das zxxfq;y$15 \; m/s^2$. 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 accelergsmft*as,2x+ h1kk: e8+ 7lxbhfe f q3ates 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 accelerates atida7)kz be2) // wjzzn $4.0 \; m/s^2$ 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 toq20j f3sijzk 19:oo :idp)+c:ouref hen speeds up with a constant acceleration:1o:cq2urs)9 jpofoiejkfi 0 3z d+ o: of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A cart with an initial ve (0yvmz9ugxc axjt 7+:locity of 5.0 m/s experiences a constant acceleration og( xj+cxz t9a0:7uym vf $2.0 \; m/s^2$. 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 horizontalls ra4 9oyoi850*w kzahy to the right (+x direction) with a speed of 500 m/s strikes a sandbag and penetrates a distance of 84ooway9sk0rh5 a i*z 10.0 cm. What is the average acceleration, in $m/s^2$, of the bullet?

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A jet fighter plane is launched from a catapult on an aircraft cjea,ha edw. xa/l-nw +n,4bh8 arrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuma/e w d-nenx 8haaj +,.hw4bl,ing the acceleration 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 constant accfe5ss.(wm5 alkyac epa eyk +e) i330+eleration 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 distawa uly*bw98l+zq-e m1 a;tu 9ance of 200 m. What is its average acy9+w 8l* euwmq; -9altzauba1 celeration?

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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 t,1 5kk r;6jk(g1z.p rbqqkzx bhe first second it travels 5.0 m. qg1krb.j,k6xq ;pz5rz k1 b(k How far will it travel during the third second?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving in a straight line with constant acceleration. *.* 8 olrodw/bjmx(d v Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during thisxljd8d .(o**wmo/b r v 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 res9l2 fshf/s0m ot 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 dr*d/b /0x xk;91ezwil.mgiu ywy road 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 turns green, a car t+vj2w -j16z5j g xy,zykya3chhat has been waiting at the intersection starts ahead with a constant acceleratihz +21 ,6 -j3acyykxgjwv zyj5on 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 pl4)2u d03*a aazp t(nga7mk ebm2 gjz(panet X where the acceleratio zkgt(uzj gd73*aema 4( a0m)2 2bpnapn 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 x7 8ndn(/+ajhj fst(y of 12 m/s on the surface of planet X where th(+jjfd y(/tsxnh7 8nae acceleration 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 Xms8v9tv(s:j1k dj f (o where the accelerationk 8fj(t91ssmjo:v d v( 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 the surpn;sqi2iz, u4,uz6 w iface of planet X where the acceleration due to gravits,2zi,zpuw4iu;inq 6y 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. z)fio w afxujamg (c6sp :i /3v9x5m6* If your friend holds a ruler between your fingers and releases it wit)/if px9aj:m ws zf (ugm36 6i5xo*avchout 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. 9eeb6wypxp-blth+fp 9 d t;/ 2 What is its velocity after 3.00 pblted 9 tx+w;2 py h-9fe6pb/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. What is the ins ngo85x *vnoj d1l-l0ia-u93dnz-c litial speed of the buzng 9lnuo l*jx lov -d1cn8-ai053d-sllet?

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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 wstu 4:2zloh m2 w4v8iup with a speed of 36.0 m/s. How long does it take to return to it2 4vhtwz2:s4om8l uiws starting point?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown downward from the top of a building with an initp4*ian)eq by d wmq9),ial speed of 25 m/s. It strikes the ground after 2.0 s. How high is the buildimaw4 d9q,)ypqn)e* bi ng?

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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 numericalw6vzf , l+-xr2rwv/ h0 wpg5pu)kwaz9 value in the blf/)vu ,z09+pw2 vhrgkwxl6 wrzp 5aw -anks)
(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 ofae7fcycb- nb l/( 3io/ 30.0 m/s. (only fill in numerical val3a cc(-yo /7nl if/bbeue 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 s? igts2e/+ omwog761dvp+ i9inxs 0( qe


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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 v,.qbv4t y 6unat 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 atjs( lw.uq;m/ym1 c a3upn6 .nt 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 t xtsgsvi qe o9 44ib/8v3n u2w,= 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 velocib ld a0lgj8g)-ty 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 t0 tv+1smeryd nyv(d1+ 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 the accelerat kgqoq,ra7ot usax.hz+-*o07 6, ppngion 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 acceleratiocj39vu )g4fre+x,r: uqk )dyt n 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 yv uj 2ix+p5c+,iez9k8ndn :caverage 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 average3ws9+o-z)atqz/ nf mr 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 dyk- pex(n: ,jp;ryg3xyx, *dpisplacement from 0 to 8.0 s?


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