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习题练习:Physics Unit2: Kinematics One Dimensional Motion



 作者: physics   总分: 98分  得分: _____________

答题人: 匿名未登录  开始时间: 22年07月19日 23:10  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that an object travels from one point in space to another. Make a c 6c*c9+lbf1.vhqh mlt c9/um/x8p vq homparison between the displacement and t t1+*b96./lmc huvc8lq9qvcfph /mhx he 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 equal to the instantaneous ve -7wuxwkzw8y+)+*cz xad2weu locity?

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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 in 884z v-l/t j9je,49uwem nz fuy s". This -zwmjuvfn e4u9z j4 9/ l,ye8tis 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 acceleration oicg/nhp, /qc8g w4m871hgfzl f $2.0 \; m/s^2$. This means the object is

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that a car traveling to the East (+x direction) begins to slow z:tl0nv*y-. p qb; oxrdown as it approaches a traffic light. Make-n *;:rlyo vb qxzp0t. 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 tk8oh :4fl4a* zrm jweoh ()9two the West (-x direction) begins to slow down as it approaches a traffic l(t*jw8l )rw:4 ozomh4 9ha efkight. Make a statement concerning its acceleration.

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that an object is moving with a constant vezqsf d kl7/( mcqp ;/4lj72odblocity. Make a statement concerning its acc qsk; dl/72/zo d(ql4 bf7mpjceleration.

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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, doe:. ud udet6 rj(jvv+q9s it mean that the acceleration is zero? Support your anu+( qed.uvtr jv9dj6:swer 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 dkspsr3(*u-s qz kil2a y9 i)6qirection when its acceleration is constant? Suppoiqa2ys3sl)q* 9zs-p(kr iu k6rt your 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 acceleratioho 3 f3 m)e22yt3mlu)w *2p fw+srfuypn. Make a statement concerning its motion with respect to t)soymwe)h3p 23 u2 yw ff+r tpf2m3*luime.

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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 decreasing uap2n)-a6l gx? Support your answer with an examplxu agal )6pn-2e.

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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 upd l 73igfb 02bulk0 z;fdfg)r. along a smooth hill of ice. Make a sf3;i0l g 0zlrg. dk72uf)b bfdtatement 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 the average of the object's 1:qhuy*say 9 xnf( txhv:.kr* initial and final velok(tfy q:.yxr us*v:9nhx *ah 1city?

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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 ad wbg z43j.*()(yfpv9h sp17ovfe acpxoi75 tt the same rate. However, object A accelerates for twicpz7a.i7p*hbd s( o 5v4e(p1jo f39f)ctxv wyge the time as object B. What is the final speed of object A compared to that of object B?

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Objects A and B both start from rest. They bo5 d up/eux9)aith accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance travel5 9dxup)/ ieuaed 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 6akr .oft6 t5dv,boe, of friction, which ofv65dootk ba 6,er .f,t 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 relearlu+2j8adc o,,hvih(y .vig0 sed from rest and falls in the absence of friction, which of the following is true concerning its cgair+d.j il(80vh2ouh y,,vmotion?

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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 str) v3h-h5 c49pr.xryf)hoife gaight up. Make a statement about the velocity and thh9f4 .35 hrgvehcxoyf r-)p )ie 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 up. What is its a0 ,vhq sg-wk/ccceleration just before it reaches it-qgcv,/w0h k ss 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 2 s3gosjs:9xdlrkp2z:c7) cnup, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocr2kcs2s9 :zl)og j7p c:s x3dnity 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 0jw4 h85o;t atu1pwlp 6w*vut a maximum height, then falls to its initial height. Make a statement about the direction of 0ppu5u1t8w; l 4wathvj o*w6t 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 c, 3w7 ewiw35 dkouj/uin the absence of air resistance. Make a statement concerning its acceleraj3 i,/wuw5ko7d u3cwetion.

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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 n:trm ,.p0ix9t/oe u06nvn sdplane. What is her acceleration when she .oe /: 6vu,snit0pn9xd0r t mnshe reaches terminal velocity?

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown vertically upward with a speed v. An identicaod pi:g- 1c kw6f8cmi *qf9se1l second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the second ball to that of the first ball? (How many times higher does tk f*f1qm sc9:-ii c8dg6ewpo1he 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 fr-f 6iidmg*u l9k e ydbg;5.qz)om the top of a building. One second later, ball B is dropped from the same building. As time progresses, the z)q-;kdydgimbgi9 l 6ef5 u*.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 n.0o+ 2,s omvrbmw2ut B is dropped from the same building. As ns+2ow m,u2otm r0b.vtime 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 h :muin),f8 ppv4wy2j building. One is thrown up, and the other is thrown down, both with the same initial speed. What are the:puy4 iv jwp2hfn 8)m,ir 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 brick is thrown strai.m7d:u2)ox0 xk74 8(t gdzl:7cxxl x gsijc axght down from the same building. They are released at the same tcs 78ld7i l7gkmc(x2jzd0 xo4:ga.)xu :txxx ime. Neglect air resistance. Compare the accelerations of the two bricks.

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving witrf 8fbmn,8 il3h constant non-zero velocity in the +x axis. The position versus time graph of this object ilb8f8mf ,n3irs

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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 acceleration in the +x axiso/n467bv 0zx; +bnkf tim;zus. The position versus time graph of thi0utzzbmi 4nsvnb;f6;+7/x o ks object is

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving with constant non-zero velocity in the +x axis. The veloyv r9e 5bn/r s866lqn;l hjo/xcity versus time graph of this o q;rlny jshx69/el vnor/685bbject 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 cong62 px gq(:zfcstant non-zero acceleration in the +x axis. The velocity versus time graph of thisg qpx(fz :cg26 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 graph nxkf9 qr 79 xozpm7tg;zm0- 4egives

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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 veloc rhq8u; n*f 8ui6ir a e94r,fpfwrrl68ity 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 curvth8iydoh ,7 wad1wg,pdy7 0j -e in an acceleration 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 i, glaa8 2-s +-lh0jgja1ybdakn a velocity versus time graph gives

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the position versus time graph of iyegvx7. 9b6n6 miz o5an object is a horizontal line, the object i5gy nxe o9i6zv67. imbs

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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 8 atyzq 5bfdeseyn m(q4;.j,; line, the object isq;( 4efqm. ,d tbes8yj y5;zna

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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 objects32wtey d0aqdv:80ts : lo c2r is a horizontal line, the object isc2tsqoy0e: dl3 :aw2 08tr svd

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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 straigh)mqg1vg4 xsqwxc82 ;st line making an angle sgx1xqqc2 sg )48wvm; of 30 degrees with the time 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 then 11.0 m y ckb 7/d7yw 7hzx1n1ad qb5y/south. Find both the distance traveled and the magnitudxb71y dc/kyyw1q a 5dz 7hnb/7e 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. ; escgz22l+8-xbt rp5/ ygf5hgozpn8How long will it take to move 12 km upstream in a rgfr y nogpse 55z8tx82 z;h-/g+lp2 cbiver 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 qqoi 7d71bhmtiwl3 h+rf :3x8 = 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 350 km in 5.15 hcmp)v1auh8 994- etfhitnvy+?

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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. Whvu7/i)fm pv3* *gt tmcat is the average speed of the runner in m/s?/iptg vt3 vm *)*cfu7m

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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 1 rzoz,aixpy/ z4 ko/,-btj4p 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 rfk5ian6u ,h35v3creone year. The speed of light is 3.00 x 108 m/ r3ki che6,5nr3fav u5s. 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 roahduwyct )a4753opb 1s d and you look to the side for 4.0 s, how far do you travel du4)oy5u1da pcb37 wtshring this inattentive period?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you run a complete loop around an outdoor track (400dps) xw4+5kyvqr))h j m), in 100 s, your average velocikhp+d vjswq)4y) r5x) ty is

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 q p4h8fepo8 9ekm east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was fep 8ph4 9eqo8the 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. vy0 xy- zu1/h87bkqnc x +fg/y It travels 1.0 km south, then 1.0 km easz0/7hxv-y n8 yk/qx1y cfbu+ gt, 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 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 for waq;s 4vs8wns k 7, wxki1i36q110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. 6x kw, v43iwiwq q1s;a78snsk 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. Wk3ekl;ca;e agvrm/ ; 7 odbun7r l2*k;hat is the average speed of the motorist for th ucerema/3onl2 vbk*l; ; rk7 d;a;7kgis 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/kyfc */2rvi)hgt6l q ,h and 2.0 h at 100 km/h. What is her average speed for the tyh ) fv2lc,/i*6gkq trrip?

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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 / bf5qp v keo5dpvrn)+(qr9t1mi/h north for 750 miles. Whado5r9pbf+ ve( q1r5 )p/ktvqnt 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 rac6i y(at umoq. msak 3a7yhzz)p:+)0 ine the anchorman (the person who runs the last 100 m) for team A can run 100 m in 9.8 s. His rival, the anchorman for team B, can cover 100 m in 10.1 s. What is the largest lead the team B runner can have when the team A runner starts the final leg of the h)0iz+qmpy:kty.man 6 zsuao7 )a3i(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 d9me1g3j:gg aej xdk p8o8) 8scomes to a stop after 10 s. The car's average velocity during deceleration was 50 km/h. What was the car's decel39gjpea m)kddsgg:8 e x1o8 8jeration 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 uum-lblq2 jr0a): wm4m/s, at the average rate of 0 -)4l ubw2majq:ulm r$15 \; m/s^2$. 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 accelerates at the ry/juv 3r /e*/ 1kfjtcdate 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 accelerijmi *2i7xx ng -7/ ixd9gsj*zates 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 spxl tw rweujrh)wr9w)5.vj;o-3 l6w5geeds up with a constant acceleration rwwt5wwu x-gj. j)lr) 69h ;5evl3wor 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 velocity of 5.0 teol/mrq028 lmpch .ad1x: +ny+ry s6m/s experiences a constant acceleration of:8e 0/o l2+rp.m xar1d mhycnqly +st6 $2.0 \; m/s^2$. 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 :*r+wt5jze9b39rco :eoozz f the right (+x direction) with a speed of 500 m/s strikes a sandbag and penetrates a distance of 10.0 cm.rze: oofz 5j39br*o:zcwe t+9 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 lff 9 55pcma:xlaunched from a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 a : lff9xmpc55s. 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 acceleration p .. *ccj7eoa-y*xb 9xuwo o)eof $2.0 \; m/s^2$ 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/( ,sumq5ue3 jls in a distance of 200 m. What is its average ac5,mjueq 3 usl(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 acceleratio0delzhhpz+ikpam+u.gd5 4;)p 5a2ux n. During the first second idpukzg )4u .5zp+2i5la xdeahm0+ ;p ht travels 5.0 m. How far will it travel during the third second?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving in a sssc,a/o /- 4umqmcw l8y1z ly+traight line with constant acceleration. Initially it is traveling at 16 m/s. Thlq/+lm1c-48 y c you,as/ swmzree seconds later it is 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 unifo nwkb6: 8jqvx+rmly 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 tiresns 0exnljf - osb469c1 on a 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 turns green, a car that has been waiting at ty0thc4ktz-ke+ f b i *y)d)g*khe intersetf b*)h+-*zc4t0yg)eykk kdiction starts ahead with a constant acceleration of $2.00 \; m/s^2$. At that moment a truck traveling with a constant velocity of 15.0 m/s overtakes and passes the car.
(a.) Calculate the time necessary for the car to reach the truck.
(b.) Calculate the distance beyond the traffic light that the car will pass the truck.
(c.) Determine the speed of the car when it passes the truck.
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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is thrown upward with a speed of 12 m/s on the surface of planetuh oc18xp(1c c(fl+ ckxkv5k5 X where the accelerkc+xk(8fpcu1vhoclxk 1c( 55ation 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/+5 kygz7 y*ljzs on the surface of planet X where the acceler zlkj+7yz yg*5ation 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 c0kzl.op zni 5:r6,aiwith a speed of 15 m/s on the surface of planet X where k:lin.,i zc5ap 60ozrthe acceleration 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 sur/qvyfm q* :t3ichpl 9)face of planet X where the acceleratio :pq*v fmtycl39)q i/hn 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 your friend holds y7pzdxa7(ennre 1ew-t(m( n 2a ruler between your fingers and releases it without warning, (a7(7ey2enxn 1nwe dzm pr-(thow 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 -v 7zj +qvpkq6e7o 5 ihig(h7pa velocity of 19.6 m/s. What is its velocity after 3.00 svvj+-7p5hiki6hq7( eog p 7zq ?

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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 i4p.fld0j,7h oly bjc6 bd8j7 7jtb5dviiv1k0nitial speed of the bull.,pl i0571v jd80o dyjldbkhc4bjfb vt67i 7jet?

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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 take t3 im d1,oay0sey8m6io o returmm 1y yio 80eid,os6a3n to its 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 downwardo yq5pjehal7xo02jp xex v69++ y q)r1 from the top of a building with an initial speed of 25 m/s. Ix2v5p+yr 6y eep+ lojq 7ho09ax1)xqjt strikes 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 a speed of 30 m .hn 0ho hat/ hv ym1,ktd5uy.af0.)rk/s. (only fill in numerical value i1 /t hr)mh. o,akdn fhk.5yh.avuty00 n 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 of 30.0 m/s. (onlivuk 9538tgawe6 was 5y fill in numerical value i5v 8sgw w93akteai56un 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 v8 gkp5p4vlq s9elocity 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 id3 .wz 1k.qd+ y) xotng*hf/qvelocity 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 velocit emkw(*n l,hz1y 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 velocity at t m),z fv0y3gpi2jeir8 = 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 velocitynk(x udqk 5n280i4d2t-*uia cec:ger 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 04:85 entwfo16w h* pv*mz toqw 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 accelerat.rpyq1j wx5 6wion 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 s bc8bxkx6*v c)01ku tacceleration 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 accele:7px mlcrd8yyy(4 f+mration 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 acceleratioq5 c(knk gik r(6ii5*wn 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 displacemen vtcnj+tc/8,9 iw/ee lt from 0 to 8.0 s?


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