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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 pointwi90*xazl3 csgyv ;t 0f ::rnt in space to another. Make a comparison between the displacemenxtc:a is0y gn*tv ;3z:f09wlrt 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 velocity of an object equal to the instantanee8 utp5eywm ss,1 -/tsous 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 advei39e2tuzq ifzknfh.:/ *l l(ertises that their car can go "from zero to sixty in 8 s". This is a descript2(eff /i u:*l.tqh kze39lniz ion 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 olj fk3d:.pgkk( m1 4y i28leukf $2.0 \; m/s^2$. 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 tq v0 uff)kcs44he East (+x direction) begins to slow down as it approaches a traffic light. Make a statement conckus qff4v)0c 4erning 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 Westbrs//1yj+t2 t y onc6c (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceltj6r b/2c+ /st1ncyyoeration.

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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 moving0fg7tbkmp3a9t f:6t14ha 5tcysm x)tfiv, 8 e with a constant velocity. Make a statement concerning i8t319,tfe7tatx pimg fc0ytsb: ha6mvf 5k4 )ts 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,5ll *-ctbb 60eafe dz. does it mean that the acceleration is zero? Support your answer with aba5l0l*ebzt.c e-f 6d n 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 constaxj vv(kptwt4v79g h3)nt? Support your answer wvpj 3(xtvh7)tg49k vwith 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 movinfmq(g667w ari g with constant acceleration. Make a statement concerni7m6riawgq6 ( fng 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 acceleration is decreasing? +w zqr9b)3jh*wif8pgp t8:sc Support your answer wi8fz:gs pc+j b8)hw*pr 3ti qw9th 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, movef+cja-c+(ip.t*h wd l s up along a smooth hill of ice. Make a statement concerning iwh. *(a+jdctil + cp-fts 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 infr y wno34d0kbx+,;m a7io)raitialkm07d,+xfba ; yn4o)rri wo3 a and 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 start at rest. They both accelerate at the same rate. Hpah*y a1ri5eh6/vlqrfi* 6d,;d, ckkowever, object A accelerates for twice the time as object B. Wh r/yk1f6 ;,* ki, *rc5qihv edp6hadlaat 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 both accelerate at the s037kpjlr ceo bf4: ik+ame rate. However, object A acceleratecfjk o 4+0il7 r3:kbeps for twice 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 rest and falls in the absencehiv2zj8b829wdbt4g m of friction, which of the following is trvzhj2 tdg4wbb9im8 28ue 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 absence of friction, whichp gv f f f2q;v7bl,0x/m8imol) of the followiv7 g8)xf, m20bf/lq pvo;milfng 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 aboutvu 4(o 6tgv25bp ro6*x)labeh the velocity and the acceleration when the ball reaches the highevb6u5e * (rgx)oplo62v4atb hst 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 accelermzr r2+dgd)+1,kwzwf so d5v)ation just before it reaches its 5) k,rmgfdr w sd+o1d+ wvzz2)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, reaches a maximum height, then fallsj :es kt8.hk/qpq/zo0 to its initial heig q0kt.:poz/k8hqesj/ ht. Make a statement about 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 yo /b ghh2ad-2aoi9b (a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the b (ohhaa2gb29-iy/ob d all 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 downwjzkc.jmt 8g7 o+ccv,gh k8e,0ard in the absence of air resistance. Make a statement concerning its accz.m k v+eg 8c,0jo,cct gjk7h8eleration.

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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 accelehoqeax)b+k-g+v 6b(4 ak +5 bv ary1rqration when she she reaches erbvab x ka)- qky+46g(5rob+q1av h+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 wg5rorqk) 3*f eith a speed v. An identical second ball is thr5 3)*kqgr eorfown 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 the second ball go than the first ball?)

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Ball A is dropped from the top of a building. One second later, l yea;7 5kqy*uball B is dropped f *; y5yuaqe7klrom 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 droppqb akg r *z ,hss+iov+w)j;59ped from the same building. As time progresses, thg vho+ p)*bkjw a59zs,si;+qre 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 to/q c.gy,kl b lwfn7 +7zc*tu6-vifvw/p of a tall building. One is thrown up, and the other is thrown7uvf+.icygl/6fkq- tw /zln ,v*w b7c down, both 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 ofnt j,t(pc d3 m(khzj): a building. A second brick is thrown straight down from the same building. They are releasemkzj:)thtj(3 c,p(d n d at the same time. 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 with constant non-zero velocity in tz eh boy(k/-w5he +x axis. The position versus time graph of thisz/-(wk byhe 5o 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 constantkalmi8mpq3 js*a,gwf jf*( k,hp a.3/ non-zero acceleration in the +x axis. The position versus time graph os.mq,/iwpphk kaafm8,ja ( *jl3*g3f f 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 qz:e /8hl/rzvin the +x axis. The velocity versus time graph of this o/qv/rz8hz: el bject 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-zev5u.cwz fs*4wro acceleration in the +x axis. The velocity versus time graph of this objects4uw5 .zfc*vw 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 versuahahs,, hx4eh8o, bpo4 y rd+*s 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 versus time g3j,)zkg r) ,dee49 yormviro7raph 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 accyctb8tc hap qlwgh+6+16*lu ju3yw,8eleration 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 curveu9j zw 1tln 2445xnpq3ecn(npp(;ic d in 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 an object is a horizontal line, the object-)kse r.3ygbtm e8ml+m gg:i* ii*e sm8 .3)tgm y+gbk m:erg-ls

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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 vertica/8qbo)2zzp ut l line, the object iso) 8b q2zputz/

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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 o,w e)m+5w o y5cfwi)fa horizontal line, the object o ew),co5ywfm5wi +)f 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 object is a. 4rq p1b d8w5rtio(gh straight line making an angle of 30 degrees witht i dro(.bw5 grqh481p 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)o b(zdq ok;cuoz2-i 0 m north and then 11.0 m south. Find both the distance traveled and the magnitude of the - oc;oio( 2dz0zku)qbdisplacement 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 to move 12 ke qcf :dp:+gy6m upstream in a river flowing 6.0 km/d 6gy+pf::c eqh?

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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 myb t+a/d) aaf k*7ysd5i = 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 kmp vsj,*++j kmh 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 )kk 1o6xyhsyi(j 0,iais the averajo h0ixiyyk1 )6(ask,ge speed of the runner in m/s?

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car travels 90 km/h. How long does 2+nafq2+muw 4 x.ynglit 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) is the dista f00d.nonmutyvhcca:uzk25 90 g -lh3nce that light travels in one year. The speed of light is 3.00 x 108 m/s. How many miles are there in a ly? (1 mi = 16090l.2ydt uu0h v caf0z n39 nohm:5-ckg 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 straig.oqlaks3+1d/ uwg t8hht road and you look to the side for 4.0 s, how far k+a /hgl .tq8s1oud w3do you travel during 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 (400 m), in 100 s, your avera)izz(hyrx.o0baciq f-oy3m58ms1: f+lt sy8 zyfi5s bhmt3)0 8mczs+y qoixl( f.a8or -:1 yge 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 travels 1.0q i+:oy+l5smg 5 fv2gu 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 lq+i+g 2:g om5fvyus5min. 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. :q tszb-n.l z65kc+: ips:.ye,lqlv f It travels 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 min. What was the bear's average veyk iss nl6+:.qvb:q tpz.lf,-: cl5 zelocity?

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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 schoox,019 vnp 6rnltsx4edl at 55 mi/h for 110 miles. It then starts to snow and you slow to x60pvnrsled49x 1 ,tn 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 80g1ur vp85+ h tsjuyt8f/n7jr7 km/h and 160 km at 100 km/h. What is the average sph71nf8 g8 +jtju5sru/yv r7t peed of the motorist 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. wpql,d ;( xojzv i4bn1r57uq: What is her average spee,or( x7l1 v5nq;qp4jz:wu db id 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 :7ou8abrhu4u mi/h north for 750 miles. What is the average speed for the triphba uu74:o8ru ?

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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 5p flw( rqcycv:7x3t9(the person who runs the last 100 m) for team A can run 100 m in 9.8 s. His riv5l :xvc9pq3f wty(7cral, 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 af q qlfv8s..ag;n nzviz,j 5i+vr-j;,kter 10 s. The car's average velocity during deceleration was 50 km/h. What was the+ r -v z,g.j lz8,;;.anqiqfvsknvji5 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 rn-:r,g arg 0rdate of adr,-nggr :r0$15 \; m/s^2$. 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 accelerat:ryj,e;i j ygx3 m,v/o(ydsv)es 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 acc /n9p b0zom )p6ux1- i8pl cpvb/u:gawelerates 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 spe6w ni/ ibp2-ff2d baq5eds up with a constant acceleration o-pa 2b w2fq ibnid5/f6f $2.0 \; m/s^2$ 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 constan vm 8/sat9:ruvt acceleration of t 9uva sr/:m8v$2.0 \; m/s^2$. 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 direct7 i3s8d6fli6 3j .cki*9hlf1g+qefkk qjm ,kqion) with a speed of 500 m/s strikes mscki 7.q,f8669jg+k3k qkl*i j1f3dhfeq lia sandbag 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 frff2 8wmxrek7pc;z:,m42b q24fv6x+ ranznryom a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and thispf 7ezfa r8rb, 42c m2mryxzqkwfx +v24;nn:6 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 w6(/t qqrj y 9,-+h,jzpfyvyosith constant acceleration of $2.0 \; m/s^2$ for 10 s, then travels with constant speed for another 10 s, and then finally slows to a stop with constant acceleration of
-$2.0 \; m/s^2$. How far does it travel?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car goes from 40 m/s tuxcksg9+ 5 zc9x6w4koo 80 m/s in a distance of 200 m. What is its average accs5xuzc +ck46k9 wgox9eleration?

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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 te7n5sg(k,/14p+np k+xdq mvx,lc kqh :j p5mf he first second it travels 5.0 m. How far will e(k/pp,xk4 m7p l,nxh+5 m+sd:vncjgfq k q15it 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 g7jf5u gf7od 9vpxmx x9/( hi-with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does9vmg97od5/ xhfg-f j xx7i(up 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 atr8:m/ c.c ft+pfet/xr $3.0 \; m/s^2$. 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 n 4-jo ;.4rdu0lbfcp 0sp zz xsf4l;b(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 bee8+w en+gbzu rxc4th gz.yq7*s0)q3as n waiting at the intersection starts ahead with a constant accg w4+zt z hgc7.by+0q8s*un esqa)r3xeleration 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 b2bjml,f y w/xhbe c/8 ;ysh6yw/m9;w a speed of 12 m/s on the surface of planet X where the acceleration d wmcw,y6hx2j ;smf /he; lbbw/y9/8b yue 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 surfvduc j:a7d3oo33f2 ,*xcnt hrace of planet X where the acceleration due to gr:x jodo,nccd*33 h 237fruvat avity 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 ss f3rp9r: b6 js+b2w2c6 gvtlwpeed of 15 m/s on the surface of planet X where the acceleration due to gravity isrltp s rjv2c 93:bw66 bfw2+gs $2.5 \; m/s^2$. 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 syq+9d:lvr8ddwq. bg7( q. ;qtxsa y:lurface of planet X where the acceleration due to gravity is q 8ly+wg drq.qsvx d7:ad :bl .t9;yq($3.5 \; m/s^2$. 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 e;f4i xy jrj1lwy m,ea/nq3/5x ly5;ffriend holds a ruler between your fingers and releases it without warnin3/5,;lmfl5y1 e j;x4 qjf ixwyayner/g, 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 velocif8enfs6cjnrc9wq2t(4 6yrl.ywa -y ,ty of 19.6 m/s. What is its velocity after 3.00 n9cc.wa w,s(6njye-2f 4y lr8 qfytr 6s?

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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 ruuh58m*;q3 aioeicl ; irz(7t97u bdceturns to its starting point in 10 s. What is the initiabiri a7 e;md5q u*tclci zh(79u;u38ol speed 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 sek 73y0 tnj:)azy1nat 4:udvomfd;y(peed of 36.0 m/s. How long does it take to ret)k7yay 0yz;3(o1dvnjn:me ud 4tfa t:urn 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 downward from the 4zdl cvlmnu97xaru593 ,r s p:top of a building with an initial speed of 25 m/s. It strikes the ground after 2.0 s. How high is the:pm5r3lac 9dsz4vnlu9xu,r7 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/s. (only fill in numericfl,n;kw/c9 w :ff ;6cmqneo 4dal value in kfnn6; c,:/cw owf f9mdel q;4the 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 aodn5e+3uqz( b3bww li t775h z c7n pu,f)doz1 speed of 30.0 m/s. (only fill in numerical value in the blank) ,h7fodp7 b 55u+i(ot e17wzc bu3 )wzlndq 3nz
(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 h4hr.0rw0ctu(fsv,vl hq1 *rm /sa9 ithe 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 velou;l8rq cb lk/:city 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 veloc)xr w )xmn45n5q ucz y bq,v*7bs-n-kzity 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 = 5.5 s) gbl.pdv9b7y* ggpk3 ?


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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 0rwi fj5 :-v c4.wyxlp0 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 veloci3jil8dw1oc quz07a s.ty 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 t sez2z:4 lda vpz+ieg.n 5y7p8he acceleration 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 acceleration at 3.0 cb+oh: mu)28 m vspdot)w;nz:pulm75 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 acceleration f r/f0ats n rh gki4ck*y74,be(rom 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 acceleration from 0 to+m zgndbz7,f 8b2kb6u* brx k5 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 jlb16d-ov roc( w r044g tv2yvfrom 0 to 8.0 s?


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