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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 frot; jpcioa:6bg 9;462 by0w sxm,cwgzim one point in space to another. Make a comparison betwee6w;:x 0syam9pj i;bitb64g2zgc,ow c n the displacement and the distance traveled.

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When is the average veloh1kut 84vch5 tcity of 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 advertises that f h2o tdzhfahb*6n)w*w:r r35 their car can go "from zero to sixty in 8 s". This is a descriphf2:*nhawrf d6zor wt b*53h)tion 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 axs +wm fs8 8afa7xa1mg2is 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 travfxget755yaq+a cpa 45 eling to the East (+x direction) begins to slow down as it approaches a traffic light. e af5q7gyaacp4x5 +t 5 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) bbj63 xjw 5tfw0egins to slow down as it appr6 x3jbwj05wft oaches a traffic 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 consth/hescgb q.+ui.fsk z8nn;7 *ant velocity. Make a statement concerning it z+b/e i.sg.nc*nsqfu7hh8k ;s 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 is2;o0r-n7rh. 0p gla ntvyx4d e zero, does it mean that the acceleration is zerox;ldpn0yhg4 0rr.2 a-vte 7o n? 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 acceleration is constant? /raxh y r7.b3us p9ffp6,k nf- Support yofn/-rsu3pf96k y xbrha.f,7p ur answer with an example.

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that an object is moving with constant acceleration.yagksk 9u e.0zl;*hh1 Make a statement concer y0;z 9.hg 1hl*eukkasning its motion with respect to time.

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Can an object have increasing speed while its accelerationr+sner0n rg5k fsj1 6; is decreasing? Support your ansksgrfnr5 s61 r;+jen0 wer 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,nwd6vn u1ld4 up along a smooth hill of ice. Make a statement concerning its accv46 n, ud1lnwdeleration.

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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 the average of the ob3y1ym 6*eh po;je/.qcxzve c 5ject's initial and final velocityjemy pocvx1 e.5c36q ezy/*;h?

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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 rate. ;d : 9qj uc/m:grhgc,wHowever, object A accelerates for twice the time as object B. What is the final spc/cdmhj qg,::g;w9ur eed 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 same rate.1x)/jx r7apvd However, object A accelerates for twice the time as oax17 dvj)xrp/ bject 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 p1tr td)txd r8e y97m9rest and falls in the absence of friction, which of the d7re9t 8yprt1t 9x) mdfollowing 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 e2pu2w onc6;8e2 rcf gy/b*9 d)mb xcefrom rest and falls in the absence of friction, which of the following is true concerning its my2o8cd;cgpce9 x)wmu b2/nbe* r26feotion?

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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 ssza;j pb9x( 7hf1bp jof2 u)x2tatement about the velocity and the acceleration when the baljb7p z)f9paj s(u2xo12b;f hxl reaches the highest point.

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown straight up. What is its acceleration)rj s-)n9k65dz xyoiy just before it reachrz jynkyx-s)9 65 di)oes 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, reachesez8 n.ma 3kub2a bh(s8s wj.i*xc7 ly. a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is going ui*jwsx.kn 7e( zcy hm3u8l8 .b. aba2sp.

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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,69lca qe7w gsw ,o-,7no6ugy e then falls to its initial height. Make a statement about the direction of the velocity and 7 we 9s qn, gyac6gwoeul-7o,6acceleration 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 th vsd/t+mfdo -kem9 /8wrown downward in the absence of air resistance. Make a statement concerning its acc dstd/+vefw/ko8 m- m9eleration.

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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 higbdixk r(5 s +-lk,j2gsot,d r4x1mej, h-flying plane. What is her acceleration when she shkdrg+e4x5j ,kdt2 1j, ,omr isl-(sbxe 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 vert1s qme9ocx -m(ically upward with a speed v. An identical second ball is thrown upward with ex s-q1m om(c9a 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. O4: gu-pfs1oc eo/:snq ne second later, ball B is dropped from the same building. As time progresses, the distance g: /1f oc4us-noqp s:ebetween 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 dvzjv(k1j35b xa7zpv+ ropped from the same building. As tiv5vxpv+z7 j(b ak1 z3jme 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 ue.gkaxcg * 99jp, and the other is thrown down, both with the same ic9akgg9je .x* nitial 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 r10/kb r5c9aitw 7b7d7(rgrvi f f9 fobrick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of t fikv9r717ror g bac/i9(7r0f fdt5 bwhe 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 consj7x hom i y1+qebii8ogr3 -3+utant non-zero velocity in the +x axis. The position versus time graph of this object ihq7x1+- bjir mg+8oio3e3iuys

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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 wit bxbr ujz(3uw +d/7yr8h constant non-zero acceleration in the +x axis. The position versus txr(d7uw8 / r yu+jbb3zime 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 y l1)6ia- equp(ij a6 nkyt*k5 buy8h/+x axis. The velocity v 6ajyt6y ihnp 18i e(b *)/u5ualkky-qersus 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 2p9l:vr() v*ekvmg jc the +x axis. The velocity versus2vvekc:)vjmp9l *(g r time graph of this object is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The slope of a position versus *jk+. )ji)btf gyx3b1 qdjia.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 velocity ver;d:o zm-qnf,4x h barc(bm+w*sus 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 ac4xtd0+l 54pdofs*c lbceleration 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 g hg9lu* -(r.a :) 3nqqgl( gsloiwlt-sraph 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 ag-q1 aciktp:. n object is a horizontal line, the object isa ci k:t1g-q.p

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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 vertical line, t 6hkuhprt4* /lhe object iskpur/ 6t*lh4h

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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 g6vlqww0,d-g,0yyix we w4 q q+raph of an object is a horizontal line, the object ivwx4yw i lq-e w6,g,dy+0qwq0s

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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 straighoixp: v: 4yb*ct line making an angle of 30 degrees with the tiyc4bi*::vx o pme axis, 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 buhlylxt8 4q6 urk: 7,then 11.0 m south. Find both the distance traveled and the magnitude b,u46qtlh:lrxy 78k u 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 in still water. How long will it take-i n/wy. )8n .pyrpfoo to move 12 km upstrip )8no/f . y.-wnoypream in a river 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 m/s? (1 mi = 160lpjy aqyh kt budeq9;)r86ya 992d 1w*9 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 spjh0 bb.1c6/f+ n. dbk tiu2p*vqad*vmeed 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 (approximately 42.0 km) in 2 hours and 57 min. What i23 u0d;+ezkvfuxfp c- s thzp; ufc xed2 3+0fvuk-e average 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. .qooh 5aog*7wmp4 n 7fHow long does it take for it to travel 400 km?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ly (light year) isrz6r1dv v+dv( (2 qqwl the distance that light travels in one year. The speed of light is 3.l1 vqd26(vr(zr+dvw q 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 a straight road a j: 41il6y*rgb o7i6b9lhip 8wqoos2wnd you look to the side for 4.0 s, how far do you travel during th*si91 :7q bwl j8bo66rl2ygi 4ioh opwis 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 ty s)oawwe9;s .rack (400 m), in 100 s, your averagy9; w)soa.sew 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 3sl6d)3c(-p-qr 4skf ilf wi qtravels 1.0 km south, then 1.0 km east, then 1.0 km north, thenpq sidiwl3 -43)f 6k frcl-q(s 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 the North Pole. It travels 1.0 km south, then 1.0 t tx3ixo 37t-4 gh-weykm east, then 1.0 km north, then 1.0 km west to retu tytx33x -gwteho7i 4-rn 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 weekkr gy o+/yt vtl+2a+4oend from school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown from scho+ rly/ok+ayto v+g2t4 ol?

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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 10qmagyb:1g vf13 otgvc;;j0 k+0 km/h. What is the average speed of the mott0;gy;v 1 kgb 3qaf:cg om+1vjorist 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 hz 20f, wi4ez mthbak+wd9e )((t*facl at 80 km/h and 2.0 h at 100 km/h. What is her average speed fltea4ekfdzm9,cafbh *2i (zw+ )0(wtor 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 nqpfx4 f/ *zgv4orth for 750 miles. Wg4 /q z*v4fpxfhat 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 anchorman (the person who runs the last 100 m) for 67pye k:t4)) p-ngxr 2bhpkkkteambrpep k4 k -)2hkx:)tgny6pk7 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 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. dlj, m9bhit9pds1*n8 The car's average velocity during deceleration wnhd1lp8m 9tj d9* ,bsias 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 w1 gh( h.vtosis4 py)3of (p4gsst y hh.13v)wio $15 \; m/s^2$. 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 accqp-f8k p/- q)gn p7morelerates 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 ar1n 4 ms gc5t9o-0z9*foukeb rnd 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 )ro +tvlo n1lpqz4e vaqd* 4.4with a constant acceleration o ltr4zv 4+ .*o4v qondeqpl)1af $2.0 \; m/s^2$ 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 constant accelfw :xzurvp5. 1f mxx:n)w;j4b eration of wxf .41zv:;xmux bfp w 5j)n:r$2.0 \; m/s^2$. 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) witrj-d qom h;n m5)e+ )x(liq0dth a speed of 500 m/s strikes a s +5qo)t0rhx q-in j( dme)dm;landbag and penetrates a distance of 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 ckm5-jfjwhf 6-( i;v2q x- gmibarrier. It reaches a speed of 42 m/sqm( vf;-g6j fih-5x2km ji-wb at the end of the catapult, and this requires 2.0 s. Assuming 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 acceler8 t2ql( sai)dgation 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 dax mu5 *ys4kd u:oaec/d02h*m/s in a distance of 200 m. What is its average accemacsdude4 *5x* 0 2:d yukaoh/leration?

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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 undergoesyvlk0v;tzux23 q9 s:k,qn 8u p uniform acceleration. During the first second it travels 5.0 m. How far will it travel during the third secv l8z32qs nyuqx;v :ku0 kp9t,ond?

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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)l z*hm ,u*rnk. Initially it is traveling at 16 m/s. Three seconds later it is*n)* ,zlhr umk 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 acyqo2 9:0 i6ipzdid )llx q08wccelerates 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 ag9o;o v:h*ul dry 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 t,avm3/pbu 1 kpurns green, a car that has been waiting at the intersection starts aheav pm,a1/u3bkp d 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 of6*jxtw9 go2y j planet X where th6w 29gxjt *ojye acceleration due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is thrown upward with a speed of 12 m/s on the surface of(+-i5owu uo kvvrr *8o4ffe(mx ve )o- planet X where the acceleration due to gravity oku(r x+fvoo iwe4 f)5v(vu-8r e*o-m 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 o q9,gq:zs 8* +zsuawqo)iyw:of planet X where the acceleration due to gr aoi8osy sq*:w:gw,zz q)u+9qavity 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 surfaksyx/ xj2fvh b.8l(u+ce of planet X where ths/8yxu b +x jhv2k(lf.e 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.o,,(r- bsa+b ohtw gu710 s. If your friend holds a ruler between your fingers andw,-ao(+tgo ,s h7rubb 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 19.65p vft7+ovt.;h7cwzs/fy u0 g m/s. What is its velocity after 3.00tfuv/5s vyg+;w0ht 7c7. p fzo 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 retur;ippu5 gjpu ;:ns to its starting point in 10 s. What is the initial spepuu;g;5pi: j ped 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 ta pw.yn1qcl q9,ke to return to its startinyl,q.nw9 1 cqpg 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 initialxu3 h7 y/s5bd4um4jg h speed of 25 m/s. It strikes the ground d4mg3hhyj 7/bu4xus 5 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 a speed of 30 m/sbi8 ;q fq 5t(y6ok8ls42cfdqq . (only fill in numerical value in the bl2iy4klb s qq;cot56 fq f8d(8qanks)
(a.) How long does it take the ball to reach the maximum height?    $s$
(b.) What is the maximum height reached by the ball?    $m$
(c.) What is its speed after 4.2 s?    $m/s$

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82#
 
填空题 ( 4.0 分) 切至整卷模式 搜藏此题  
  A foul ball is hit straight up into the air with a speed of 30.0 m/s.gftb-- bjohg v48/h m/tj /zl: (only fill in numztj-ghmg-o vjf4/ bbh: lt//8 erical 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 = gd)j ++dhs ,v/adabu+zj 0 cq 5o5my3i1.0 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 velg 0a3;h( jnrtqocity 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 = 4.0 s?:( p-y:jai. iz /akiou


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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(.cic 4 qbysm)v;7zcz 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 iskpn mj m7pqp4e: l+(, 5ghz)fd the average 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 velocit;t8u9f cw e9 b2 d6cmn7h85gem:vra,e+ndqqyy from 0 to 6.0 s?


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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the acceleration at 1.0 8ehl3b7hq0 , wzx7uisxh9en - s?


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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the acceleration at 3.0 sk7a/dm4d8ns0: zcfr26t8j huf wu8di ?


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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 avera e(brz2n.h c7yp9ee j8ge 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 a7rr/ ( mgj- ooilog3v3cceleration 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 2tlva *ni2nl8n (ckl;the displacement from 0 to 8.0 s?


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