Suppose that an object travels from one point in spay,8l3:1lhm.jjx,ya an nq+ xdce to another. Make a comparison between the displacement and the distance trav ax+,m:lqn hy n,.jy3jd 8a1xleled.

  When is the average velocity of an objec co aakhn;oj+-o+ 2,kwt equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero td 89,c7ssso nto sixty in 8 s". d,s79 8ncts soThis is a description of

  An object moving in the +x axis experiences ah21 h 4bun1k1yii;tr pn acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) bniubj84o wn39tx 7r i0egins to slow down as it approaches a traffic light. Make a ni47 30u9xn8wi btrojstatement concerning its acceleration.

  Suppose that a car travelin v6y2*vzorimd i0. *eng to the West (-x direction) begins to slow down as it amzn* d*oyie r. ivv062pproaches a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant g0 cqsrf(.rc8 velocity. Make a statement congrcf 0( qcr8s.cerning its acceleration.

  If the velocity of an object is zero, does it mean that the acceleratifx,w)is ofzrl2. 5d* op4y2gkon is zero? Support your answer with an ex .,52rw ds)i24ogfoxzfpyk* lample.

  Can an object's velocity change direction when its acceleration is constant? 5dwcip+: /jn j Support your npi /w5 dj+c:janswer with an example.

  Suppose that an object is moving with constant acceleration. M ghi-w4npumjafg)fqswq o5 4b(, 2 1,nake a statement concerning its motion with ro4wwf) u,igs4 b(jnhnm12q-gp, q5afespect to time.

  Can an object have i y3w*hp6 zr;l-jxbm*+ ,m jkcwncreasing speed while its acceleration is decreasing? Support your answer with an examplem3+y 6l w-*c ; mpkhwx*j,zbjr.

  Suppose a can, after an initial kic 1 qbz:dgjpn534f *hojk, moves up along a smooth hill of ice. Make a statement concerning its*nq4h gf:bzj1 5jdp3o acceleration.

  Under what condition is average velocity equal to the avaw ck:wkg:v5o)5kd. nqvzf5qchs . 4 /erage of the object's initial and final velocinv d:kg:q./f5 5.4a5w c)vhczqwsk okty?

  Objects A and B both start at rest. They both accelerate at t14,nodni u5v fhe same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared tovun4f,nd1o 5 i that of object B?

  Objects A and B both start from rest. They loea+iug,et;g ( ui:5both accelerate at the same rate. However, object A accelerat a(+;oue,ulg 5:ieigtes for twice the time as object B. What is the distance traveled by object A compared to that of object B?

  When an object is released from rest and falls in the absence of frf utppoozqq3 tf 6wmd;crq wp3(62 1;;iction, which of the following is trdwf6p;qt w 2ocqtmzu1( 3f;;o pr3p6q ue concerning its motion?

  When an object is released from rest and falls in the absen j*;rvg2i fg*wce of friction, which of the following is true concerning rv; g2ji*fw*g its motion?

  Suppose a ball is thrown straight up. Make a statement about the velocity 1p0u xprex m;1and the acceleration when the be 0;1mrxpu1pxall reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration just beforbb/d- )vxd;2jtvvg (twf69t we it reaches its highest po v (9j gvt)wx2bwtd-f;b/t6vdint?

  Suppose a ball is thrown straight up, reaches a maximum height, then fall *jlnzb1wj:)oyt2*jrs to its *1oj :*yjrt2lw zbjn)initial height. Make a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reacr vx4 3gak h)jslc18 (0nwrf-dhes a maximum height, then falls to its initial height. Make a statement vc )kfa ( js drh-1r3gx4w8n0labout the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of airkf: 1r)ce8apx resistance. Make a statement concerning its acceler8akc1xfe :rp) ation.

  Suppose a skydiver jumps from a high-flying plane. Wh fkd)h5+hg 9an8wf97z :vsksswrrj*9 at is her acceleration when she she reacheszv:95n fwr 7 9*as8h9)kswhrgd fj+k s terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical second balli7by1 uqb(gg1qkn9-1dt r.;y x/ ycvb is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the second ball to that n-1 1d.bbq;b(/kvt q1 gy9ycg7ixury of the first ball? (How many times higher does the second ball go than the first ball?)

  Ball A is dropped from the top w5sq.pi bv)t mwwnk11a 34 f4oof a building. One second later, ball B is dropped from the same building. As time proq)s t144.bn o3w1f m wkvpaiw5gresses, the distance between them

  Ball A is dropped from the 9+w3p92sqojzwo l (v0jokt2vv) uk d)top of a building. One second later, ball B is dropped from the same building. As time 3jd 2) vo(po2vz l+t q9jkuso w0v9kw)progresses, the difference in their speeds

  Two objects are thrown frp 1n22*kofr -eu e:lqbke3s b6om the top of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are th*p bqenu -k:ee l2of2k 61brs3eir speeds when they hit the street?

  A brick is dropped from the top of a building. A second bric+rc+levqoen6c/q l -wggq ym9r37zd5fw6 g.9 k is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compareg dcc/v3e9or.ynw 5z+ lqqwg7-m6gler9+6qf the accelerations of the two bricks.

  An object is moving with constant z+nzdd 7y;4 mvnon-zero velocity in the +x axis. The position versus tim7dzy 4 znv;+dme graph of this object is

  An object is moving with co.n( ii(9xa0(rfuf o uknstant non-zero acceleration in the +x axis. The position vers(i.uff( u o0arnk(x9ius time graph of this object is

  An object is moving with constant non-zero velocity in the +x axis. r+xva.:2shnr zw0;e vThe velocity versus time gre ;whan v0zx.+ r:vrs2aph of this object is

  An object is moving with constant n /aoh+bp8:yb7yc(vngsl* s( xon-zero acceleration in the +x axis. The velocity versus time graph of thisgnxb8 h7(o(syb:ascp/v* + ly object is

  The slope of a position versus time graph gwywzle,kb-. 79e8w 5auly6 wo t .joq)n:b/rqives

  The slope of a velocity versus time graph g od,8igc.lt o )l+bev4ives

  The area under a curve in an acceleration versus x,3yi3rtu: 87grvnt 3c-jmvi time graph gives

  The area under a curve in a velocdi01achos9q v6 j3je:ity versus time graph gives

  If the position versus time graph ofy;is+b q57nssb9 e6 p1q 1b8) 2otsnqgobpxj/ an object is a horizontal line, the object iso b e96 1bb5 jsn7t28psnpy)sbsg+q /i;q qo1x

  If the position versus time graph of an object is a vertical line, the obje q4ywdcluj ,(6ct isqd c4jlw(6 y,u

  If the velocity versus time graph of an object is a horizo42 c5+aibuq cdqbcl23wmn,1 ev j- qz/ntal line, the object islmd/wa ,2bc qqqj 2 n14vz-5c3ecub+i

  If the velocity versus time graph of an object is a straight line makingzcy tz3 www/q u1).n-,csru 2c an angle of 30 degrees with the time axis, the objws/,nw . cu3)rccq tu2zz1-wyect is

  An object moves 15.0 m north and then 11.0 m soutzl ) a7pim3m1eh. Find both the distance traveled and the magnitude of the) 1mi7pealmz3 displacement vector.

  A boat can move at 30 km/h in still water. How lrr-5 qil:wtee dz 6)a )d9g+caong will it take to move 12 km upstream in a t 6 i) zadl:e)qwead5r-c+9rgriver flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1wu zqd +-mt0tmcgh d*4ws v+6z1u8t7 k609 m)

  What must be your average speed in order to travel 350 km4*j hc0xasz8;l qgoey c h:n/: in 5.15 h?

  A runner ran the marathon (approximately 4-4sszf (x:y1gd h4 ;n)mmmgia2.0 km) in 2 hours and 57 min. What is the average sp gfdah-)xg;s4z(nm :i4 s1mm yeed of the runner in m/s?

  A car travels 90 km/h. How long does itxt 4nywe.z dp-d;i 9)w take for it to travel 400 km?

  A ly (light year) is the distance thal5k.gj n6i-0css6t i kt light travels in one year. The speed of l0s 6nkcg-tskl 56ii j.ight is $3.00 \times 10^8 \; m/s$. How many miles are there in a light year? (1 mi = 1609 m, 1 yr = 365 d.)

  If you are driving 72 km/h auhsu.tz29 )ti long a straight road and you look to the side for 4.0 s, how far do you travel du).9tu zt2shuiring this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, your av02.7niet uoxnyig k 2-eraet o22 gniyuxi .7n-0kge velocity is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 k+/dhpt i-rmd 7lds 83g5 uf+b26lq*aft 2suikm east, then 1.0 km north, then 1.0 km west to return to its starting podlp8h*i rtbusd+s 7 mfa2g6dq ikt-u35l 2/f+int. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It travels 1.0 km south,,gvf b 3,9fsvo 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 avegb3,os, vf9vf rage velocity?

  You are driving home on a weekfk61ef0(v i,yddtq -2cpf 9odend from school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive 9 cid1kf6fpdqdo0vy(-e 2, tf home after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What is the ave e*d9zupai2a5k rx .0nrage speed 2zp uxneaa09kr.*d 5 iof the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is ikjfbvp20e :5her average speed fobv2 p:ij5ef0kr the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mixp3j9cs0ly t :/h north for 750 miles. What is the average speed for the triplyt: j9c3 sp0x?

  In a 400-m relay race the anchorman (the person who runs the last 100 m)oa 1qw h+x3extx*ofsf 2uh,;, hw- di4 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 racd f24,se+x1t *u iwfhhq3a,hoo-;wxx e, in order that the team A runner not lose the race?

  A car decelerates uniformly and comes to a stop after 9 s. Thv(i/w m4zdp,/ s,tzh oe car's average velocity duhv om/zw/,, t sz4dip(ring deceleration was 54 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speoo u5 x8bt4fp. npr.u3ed from 100 m/s to 160 m/s, at the average rate of pt fu xr8uo.b345on.p$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at y ):frcrr1r /:o oohxon+)i.5q jhi9qthe rate of $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from rest and accelerate *yhhk/.8krl-gxmy4yc -n -og s 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?

  A car travels at 15 m/s for 10 s. It then speeds up with a constant accelb k uym9oa-4b,eratiou9y -kbb,4ao mn of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocie npv x3.+aeeqyb0 h.i qg.r04ty of 2.4 m/s experiences a constant acceleration of b.qiey0+ n.4r pe3.vaex0qg h $1.1 \; m/s^2$. What is the cart's displacement during the first 7.4 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed o:-b1+4, oi1k( wceipu5e,to hpe un pikhu+z(f 452 m/s p++,u, obwec h( 1z-e5kpo n 4eu(pti u1:iikhstrikes a sandbag and penetrates a distance of 23.92 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrb ;;7xuvy6:v-w 3vn:kb wlrrg ier. It reaches a speed of 42 m/s at the end or k;lb::xbv3rywunw-;7g 6 vvf the catapult, and this requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves d55d379k-;cc c4ty lvy r9euhj ceh .lwith 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?

  A car goes from 40 m/s to 80 mdt*r/g6s d:lc/s in a distance of 200 m. What is its average acceleration d6drl */t:gcs?

  An object starts from rest and undergoes uniform accelerav2hc-vsg u :/ndg7-d ytion. During the first second it travels 9.7 m. How far will it travel duringh/ s 2d d7n-c-gvu:vgy the third second?

  An object is moving in a straight line with constant accel-xu aqi 54 cqsp)l.mu2eration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this ti-l 5u aq s.p2uic)xm4qme?

  A car starts from rest v5of6dinx6y (79ulzband 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?

  A car with good tires on a dry road can decelerate at abouths1 xn;yhn0o+ 5*0zu yf +ud )og0xprm $5.0 \; m/s^2$ when braking. Suppose a car is initially traveling at 55 mi/h.
(a.) How much time does it take the car to stop?    $s$ (only input numerical values)
(b.) What is the stopping distance?    $m$ ((only input numerical values)

  At the instant a traffic light turns green, a car that has dj23j 6t ii;z9 qwgw;jbeen waiting at the intersection starts aheadi tdigq j;3w2z;9wj 6j 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.    $s$ (only fill in numerical values)
(b.) Calculate the distance beyond the traffic light that the car will pass the truck.    $m$ (only fill in numerical values)
(c.) Determine the speed of the car when it passes the truck.    $m/s$ (only fill in numerical values)

  An object is thrown upward with a speed of 12 m/s 2j7wlei;s8 y zon the surface of planet X where the acceleration duees;l w8iz7yj 2 to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with3tewagd(0 t*9f p(w6,6vhvhu 9vu bki a speed of 12 m/s on the surface of planet X where the acceleration due to gravia0t vedi69((9 w* t bgvhw3f vkuu6p,hty is $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

  An object is thrown upward with a speed of 15 m/s on the surface of planex/(c jg2c8eq/8 xxpev t X where the acceleration due to /v8xq2e8cep gcjxx (/gravity is $2.5 \; m/s^2$. How long does it take for the object to return to where it is thrown?

  An object is thrown upward with a speed of 14 m/s on the suff3: lk6k 9bklrface of planet X where the acceleration due to g 639kbf: lkklfravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greater than 0.10 -( )ixuen)f-beegaj / s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall before bg -ee)fx) (ue/jan-iyou catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. What i0hlm2(ym.7m2pr16yoqa329 hjva3fi kr ii s ys its velocity after 3.0f26vpqyi2(a1h02 3s7h mii .l jym3ao mrkry90 s?

  A bullet shot straight up returns to its starting point in 20 s. What is expxdn.5 usk f/9 3na :qx.nqs(t4hf1 the initias3p4:n1 un xhxkf5x (q9eadf ..sq/ntl speed of the bullet?

  A ball is thrown straight up with a ss 9rl4wkf7nst2:dic ;peed of 36.0 m/s. How long does it take to return to its i: 42 s7tnc9;rwd sklfstarting point?

  A ball is thrown downward from c/yqj.h e 6dxwq .mea1qgs:yo9m;6v( the top of a building with an initial speed of 12 m/s. It strikes the ground after 4.9 s. How high is the buildinq/jwe.sm.:q;mxoc adv1 e 9h6yyg6q(g?

  A ball is thrown straight up with a speed of 30 m/s. (onlr z*q2 -rk/iqdrxbj, 8y fill in numerical value in the-,r dr jqrk/z8 2*qbxi 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?    $m/s$

  A foul ball is hit straight up into the air with a speed ofjmw4xhlz6 5gs2gr-zi eou18 :zr.(cx 43.3 m/s. (use $g=10 \; m/s^2$, only fill in numerical value in the blank)
(a.) Calculate the time required for the ball to rise to its maximum height.  (数值)  $s$
(b.) Calculate the time for the ball to fall back to the height at which it was hit.  (数值)  $s$
(c.) Calculate the maximum height reached by the ball.  (数值)  $m$
(d.) Calculate the ball's speed 2 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 14 m above the point of contact between the bat and ball for the first time.  (数值)  $s$
(f.) Determine the time at which the ball pass a point 14.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the veloci1 n, ynh4o92 3b p*3wvy7v7wrrchvou fty at t = 1.0 s?

  In Fig. below, what is the velocity at t tknece mouz w 7*,6a3(= 2.5 s?

  In Fig. below, what is the velocity at t = 4.0 s j 3i5co)8vjbf3doem+ ?

  In Fig. below, what is the velocity at t = 5.5 u e,bsl 2rqd8-i28t v.t-wzu6ty+y dhs?

  In Fig. below, what is the average velocity from 0 to 4.0 s?zp6 pbp+sk aykc1k 288

  In Fig. below, what is the average velocity froaef48 2 dshf iry h9hqd,3r9j-m 0 to 6.0 s?

  In Fig. below, what is the lqeen 99y1+6g j nm):qenc6tnacceleration at 1.0 s?

  In Fig. below, what is the accewwiu ddh9*8cmv3,. orleration at 3.0 s?

  In Fig. below, what is the average acy-no5q;;ged62a c qqe celeration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 to 8.k44 63fzbpo a6u-yvehak,s3 x 0 s?

  In Fig. below, what is the displacement from 0 to 8d*mu1di2d+tke 2x+04vugs 8 lcfv*oy.0 s?

Does a car speedometer meaod+e4v7 evd nvfu.qb)- j/e1 psure speed, velocity? {speed|velocity}

  An object can have a varying speed if its velocity is cu dxkqngsp)( k98 jz42m 9brz+onstant.

  The velocity of an object can be negak 60;qh)xu *3lmlb g*mjds fi0tive when its acceleration is positive.

  If one object has a greater spe qd gupms- s+e i-bhmnm72z6)o2*c0 ywed than a second object, the first must have a greater accelerationp-2us 7bo-h )zw si0deq m+6 mgc2*ynm.

  Two cars emerge side 0clag.b8n x ueh0+c3k by side from a tunnel. Car A is traveling with a speed of $60 \; km/h$ and has an acceleration of $40 \; km/h/min$ Car B has a speed of $40 \; km/h$ and has an acceleration of $60 \; km/h/min$ . Can A will pass car B at the instant they come out of the tunnel.

  An object can be increasin3e )*c milz:a1picnm m 71rjv p2id,b5g in speed as its acceleration decreases.

  A baseball player hits a foul ball straight up inton83i*xws rju:uc2q,h.q2d ph the air. It leaves the bat with a spehuuq h232rx8 cq:s.jw ndp*,ied of $120 \; km/h$. In the absence of air resistance, how fast will the ball be traveling when the catcher catches it?    $km/h$ (please only fill in numerical value in the blank)

  As a freely falling objecteh;r9v m: 3zbx speeds up, what is happening to its acceleration, how does it change if air frievx :b3rm;h z9ction is ignored?

  As a freely falling object speeds wc(*/xbpoty d 16b*pg up, what is happening to its acceleration, how does it change if air friction CANw( g*b1p*6p coy tdb/x NOT be ignored?

  An object that is thrown vertically upward wiyq bz;pgs,f :slo5.(tll return to its original position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this.z5gf ptq,l:;sb yos ( result be altered?

  An object can have zg1;vt1y3vp0;1 ux imzy ,xmnfjz kw)9ero velocity and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at t2 o+8wpu h: zmgftf4a;he same time.

  An elevator moving from the se o 6tyk yz drf6 fth zr8.kr:(uk8u;cx*cy*42kcond floor to the fifth floor making no stops along the way has zero accu 6ur4f xyztk (cc;koh*tkry*y.f:zrk6 8 8 d2eleration all the time.

  A rolling ball moves fr/9 u8u*.uzxk2 c;pnq7eygfocxbl1f ) om $x_1=2.3 \mathrm{~cm}$ to $x_2=-8.3 \mathrm{~cm}$ during the time from $t_1=2.0 \mathrm{~s}$ to $t_2=5.9 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.7 \mathrm{~s}$ is at $x_1=2.9 \mathrm{~cm}$ and at $t_2=3.3 \mathrm{~s}$ is at $x_2=8.4 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complet3d6i 9fdoj nw5e laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 6.5 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from3nfkrcpfsym a 5d14 meq(pcbg8+)l-7 v o b5w- its trainer in a straight line, moving 114 m away in 10.0 s. It then turns abruptly and 3s5c)vg5 f7kmq -db+8(fbpylwepo4 a- 1rncmgallops halfway back in 4.8 s. Calculate (a) its average speed  (数值)  $m/s$ and (b) its average velocity  (数值)  $m/s$ for the entire trip, using “away from the trainer” as the positive direction.

  A car accelerates from )9sow w ii6sxj)3f)ha$13 \; m/s$ to $24 \; m/s$ in 4.5 s. What was its acceleration?  (数值)  $m/s^2$ How far did it travel in this time?  (数值)  $m$ Assume constant acceleration.

  A car slows down from56gjp ikjh(w-fa +,c2o ne j85pov ws1 $17 \; m/s$ to rest in a distance of 78 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reac0/vtu i u d65xa*oz:fyvbqq /5h a speed of $32 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.1 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks oxr n(:)0fog2ivnh e568cqjvto essentially top speed about vjnf2(o0c nqi8ego )6hr 5x: v$10.6 \; m/s$ in the first 11.2 m of the race. What is the average acceleration of this sprinter?  (数值)  $m/s^2$ and how long does it take her to reach that speed?  (数值)  $s$

  A car slows down uniforml)op kbf/ r,)jxbf- 3 s,p2hwdwy from a speed of $15 \; m/s$ to rest in 5.01 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 m long on the highway. Assuming gt(lqg xx32 y2/(bioba deceleration o xbqyglb(i/g3 (o22t xf $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truc i+tbvxs.+fbo (2ae/nk going $25 \; m/s$ on the highway. The car’s driver looks for an opportunity to pass, guessing that his car can accelerate at $1.0 \; m/s^2$. He gauges that he has to cover the 20-m length of the truck, plus 10 m clear room at the rear of the truck and 10 m more at the front of it. In the oncoming lane, he sees a car approaching, probably also traveling at $25 \; m/s$. What is the closest distance of the approaching car that he can still sately make the attempt to pass the truck? (without hitting the approaching car).    $m$

  A runner hopes to complete the 10,000-m run in less thandgk7 hz*di;u : 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner must then accelerate d:gzui*k7 h d;at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$