Suppose that an object travels from one point in space to another. Make a compz7 o*okl2v2vlarison between the displacementok22oz vlv*7l and the distance traveled.

  When is the average velocity of an object equal to the insth;o0 e4qt tk*z 7ojie2antaneous velocity?

  A new car manufactur 8njnrru2uj -+er advertises that their car can go "from zero to sixty in 8 s". This is+u j-2nurj8rn a description of

  An object moving in the +x axis experiences an acceleratxig2k;v n oc17ion of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) bebgg5 ;dyb cf23 3emdl5gins to slow down as it approaches a traffic light. Make a statement concerning its accelerationlgf y2e ; 5dbm3d5cg3b.

  Suppose that a car tr8t7 p0bgsfdab2j:v ; paveling to the West (-x direction) begins to slow down as it a:asdg8vbt7p2;b f j0p pproaches a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant veloo u,,m2/fzqu (a4t jej5uacz6city. Make a statement concerning its acceleratiotzzc au(jeujo,/,6fm2q u4 5a n.

  If the velocity of an object is zero, does it mean that the acceleratioe;:sr 3p o/mx1es jp d3u7at,vn is zero? Support your answer with an exard e;xu3a7s/s,pm e1j3t:pov mple.

  Can an object's velocity change direction when its au /c;citru g6bzhp l 8vo)nmha47928 lcceleration is constant? Supporo9u 78av2;zcr mp g4 8l)ctb uhin6h/lt your answer with an example.

  Suppose that an object is moving with constant acceleration. Make a str1-pvw c- w,fhj+ez1 batement concerning its motion phj- 1 +ww,-revb1zfcwith respect to time.

  Can an object have increasing speed while it mi6 fyyx2*dl g-+-phis acceleration is decreasing? Support your answer with an example- ipm h-6x+gfliydy2*.

  Suppose a can, after an initq57( q:bj zsx wk04imvz+t r3eial kick, moves up along a smooth hill of ice. Make a stat5x ( tzbqzm :+es0rvw4j37kiqement concerning its acceleration.

  Under what condition is average ve4 )h.buxwd4a4 ,krwex-ki, bplocity equal to the average of the object's initial and k)u .4,pdxwhiar web4-,b4kx final velocity?

  Objects A and B both start at rest. They both accelerate 4ysde*7uo3fa*f(vce at the same rate. However,offysu3 d7 cvaee*4(* object A accelerates for twice the time as object B. What is the final speed of object A compared to that of object B?

  Objects A and B both start from /mb we5 ; hdya,zvj:y-rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance travel myjahd5b-/:e yw;zv,ed by object A compared to that of object B?

  When an object is released from rest and falls int e 0-nxav16dphs 11hr4syi o- the absence of friction, which of the following is true concerning it y nxstehpro4d10 ha-6-1iv 1ss motion?

  When an object is released frod7qaobg9 qx0t/ ht( 2um rest and falls in the absence of friction, which of the following is true concerning its mot h 7uxtoda9q 2g(tb/0qion?

  Suppose a ball is thrown straight up. Make a statement about the velohl 9)x1ncv2s j5ymao:,2qhzm nw-io(city and the acceler nmn-vy2h,: wxa29 jcmz)ol(5hs ioq 1ation when the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its accelu,y8 bo+d,78kcnsh nf pp4xn6eration just before it reaches its highest pointk nx +4,yco7,sp8pdn8hn u6f b?

  Suppose a ball is thrown str3; +fqhbup v8i1 27csi5sohj uaight up, reaches a maximum height, then falls to its initial height. Make +sp7ih;vj 18o2fq5 b 3hcuuisa statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a m2(xc3bequ *ev aximum height, then falls to its initial height. Make a statement about the direction of the velocity and accelev2u xc*(3eb qeration as the ball is coming down.

  Suppose a ball is thrown downward, x d-howrysb,mb,(pmby 8.l 0 in the absence of air resistance. Make a statem,wdm(b8xh, sr0ymob. p ,-ybl ent concerning its acceleration.

  Suppose a skydiver jumps from a tgbml1 8fm g:0high-flying plane. What is her acceleration when she she reaches terminal vmlgb: 1gt 0m8felocity?

  A ball is thrown vertically upward with a speed v. An oi7 o7goh:by1identical 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 the second ball goy7gb71o :hoio than the first ball?)

  Ball A is dropped from the top ob,d*o-f dwro:xz2o4yv(aah6 7h o cv .f a building. One second later, ball B is dropped from the same buil,a:o(*f6o a2xbwvdh . d rhvz4 -oyo7cding. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One second later, ball B is phwq g umwd2d ) .()kg+ ksv7d/.0nuerdropped from thk q m.)epd)udurnw0w+sdk/7ggh2 .( v e same building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a udgt0 uck8oiji )r:4z1 ec0a87t 9cdxtall building. One is thrown up, and the other is thrown down, both with the same initial speed. c8i 9x)u0u t8t7g4dkea01oc czd:rijWhat are their speeds when they hit the street?

  A brick is dropped from the top of a buildinn3d-4bbmw 1r.kj gy5 lg. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the.l41yw-3r mbbj gknd5 accelerations of the two bricks.

  An object is moving with consta-dz(qp eh s6bf*lzv js9*,r a(nt non-zero velocity in the +x axis. The position versus time graph of this ofqer(bl6a (, pzv**ss j9zhd-bject is

  An object is moving with con6z0kh f b;pvm+0rs r0nstant non-zero acceleration in the +x axis. The position versus time graph of this o0n00; frs+r mzk6phvb bject is

  An object is moving with khw7,pfc4 j)gconstant non-zero velocity in the +x axis. The velocity versus t fc gh,kw)74pjime graph of this object is

  An object is moving witfo26och):lkmd-m-b kw, ;p s zh constant non-zero acceleration in the +x axis. The velocity po:lkosdzkf 6c bm2wm,-h;-) versus time graph of this object is

  The slope of a position versus time ro*1e vnc2+4jokpb; g;v, otkgraph gives

  The slope of a velocity versus tpd1;ejt*kxbdx(67sjj8h; k time graph gives

  The area under a curve in/xe .bb*0j 9seekrex8 4am.tk an acceleration versus time graph gives

  The area under a curve in a velocity versus time graph fo,k5mpr50kc9 wlmg( gives

  If the position versus time graph of an object is a horizontal line, the sw6wk w5f; u.;u t8ba.jph 1llobject is5bw hsu;u8..l6;f1 l ktwjw pa

  If the position versus time graph of an objecm1 t*896)1t q+h75ep hzka q kkmzekeht is a vertical line, the object ish5h1 zk1t*6kq)pk zt+h eq7e me89mka

  If the velocity versus time graph of an objec6/yqo6 shc m3jt is a horizontal line, the object ishjocms/ qy663

  If the velocity versus time graph of an objec+- el8f3l4 pzfc liap,qo7c-nt is a straight line making an angle of 30ql, z-cei3 pfl4+p n7fo8-a cl degrees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the distance ; buh tt*kxjq/oyo6;1 rg4i) utraveled and the jx *hq ui4 t/rg)o;;ko1ybt6u magnitude of the displacement vector.

  A boat can move at 30 km/h in stingjkrn)o50p y 8wb85yll water. How long will it take to move 12 km upstream in a river flowing 6.0 km/rg88 wbnnpk5)0oj yy5h?

  55 mi/h is how many m/;0g*nf nuy w ka:6i*jts? (1 mi = 1609 m)

  What must be your average speed in order to travehj jq or*(,avze,:af4l 350 km in 5.15 h?

  A runner ran the mar0fs-8w+ pc )vzxvrj3uuba2u +,a /ux uathon (approximately 42.0 km) in 2 hours and 57 min. What isuc2vvxbuafz3 w+pj,8xuus +a /0-ru ) the average speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for tcd8aga/fm3; it to travel 400 km?

  A ly (light year) is the distance tdh :1rma9m i yr03a/yqhat light travels in one year. The speed of lightr/m93aidh ya r0 qy1:m 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 along a sl ku/m(ka:ti .hbi8w8traight road and you look to the side for 4.0 s, how far do you travel during thiuwmbl k 8/(ia:.kh8its inattentive period?

  If you run a complete loop around an outdoor trarjuy 0gj6;b8r ck (400 m), in 100 s, your averag jg8 60j;ryubre velocity is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 kmc l4* z:l.orucg3n n6qv5), /lyeu lx66wslrj east, then 1.0 km north, then 1.0 km west to rec /lr .q6u5u66xsly4zrj lvg nn*l:3,wl)oceturn to its starting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at t yzj42iou 9wl6zgt/nxx648f zhe North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This tzo/ izxfunly 266984 tzjxg4w rip takes 45 min. What was the bear's average velocity?

  You are driving home on a weeken ba rtj2xhe,* (*l3nloag o)d6d from school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/o*oeb2l,h*)rdj(aa6gntlx 3 h. You arrive 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 avd,f:xvru 4a*jrq6l3 xerage,j 3* 6xxudfvrl:aq4r speed of the motorist for this trip?

  A motorist travels for 3uhb)lq ( y4g587jyg55w nuhro .0 h at 80 km/h and 2.0 h at 100 km/h. What is her average speedro(n yg8) ljbhy 55 g74uquh5w for the trip?

  An airplane travels at 300 mi/h south for 2.00 j( 2j z9-(cohtziv)ij h and then at 250 mi/h north for 79c)jj2oij ( -hz(v itz50 miles. What is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 100 m)z p( o*ydju5(i (jd1zb 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 race,* (z(oiu15pdb jzyj( d in order that the team A runner not lose the race?

  A car decelerates uniformly and comes to a stop after 12 sgwlzw.q:x39*d 1hk)mt5cv e x. The car's average velocity during decelerkcw5dt:lq wv3) mex zh*.19xgation was 32 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed id 4;q 91hqza .xkpzm.from 100 m/s to 160 m/s, at the average rate of .h mz id1zq.kpx 94a;q$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rahi*c(am 4v1b5y:ro dgte 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 acceleef1,uair+w5pnvkp+ e0w5rn / rates 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 constant6-igq9m nv+pw 8un1xts i +fs(ez :ht. acceleratio:v.t( tgie1fq8-+xhpsunn zws6m i9 +n of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity q.7 za4n+i5bbmyadbzix8k- ,yt -2 doe s;/l kof 5.7 m/s experiences a constant acceleration ofs ie48;t/kl7x-,bq dzakaboy +n2d b i-z 5y.m $2.2 \; m/s^2$. What is the cart's displacement during the first 8.4 s of its motion?

  A bullet moving horizontally ;::ben* vfolyto the right (+x direction) with a speed of 257 m/s strikes a sandbag b vn :loyf;e*:and penetrates a distance of 31.89 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched xaq .z j;+hwh -o)7 d3nqapep4from a catapult on an aircraft carrier. It reaches a spe. h3)dzq-e a+noj; w7xa4hpq ped of 42 m/s at the end of 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 with constant accelerat0dchf o65 vtbazgjx8ok hm z4gs-(7vl(/ 6 8bnion 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 m/s in a distance of 200 m. Wflxt0;cr /0( qsex( brhat is its average acceleration?tq (cf(/xr b;rxle0s0

  An object starts from rest and undergoes uniform acceleration. During the fir8:fnf xv5ca ak/gnu mwl j;.7-st second it tra;xn v jwmn-.a fkau5f8clg7:/vels 5.9 m. How far will it travel during the third second?

  An object is moving in a straight line with conp9kvyp 4e;*ou9vqww (stant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. Howu(9wk v4 q*evp oy;9pw far does it move during this time?

  A car starts from rest and acceleras hpwr9)ewep05 yk nu82pls3g+5 k/hates 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 mx94s5 i.:6 u fu:av2sk+ fjhr,wzwkqdry 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?    $s$ (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 tu4 07pqmg;v4uno :g*m6gsoskh9r5o0qs6m kd hat has been waiting at the interse os 5k67ugmnqm0m:rs spg;h*96u 4qg do4vko 0ction 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.    $s$ (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 spth4vmyq dc/,;ph fc) e2s 4bd)u e/9ykeed of 12 m/s on the surface of planet X where the accelerativmyc4 ce 2 /4 )y,h9d;shpk fb)/teudqon due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a speed of 12 m/s on the surface of planet ,.1. n(s4nsypyvaodt X where tn1 yv4.apon (t,d.y sshe acceleration due to gravity 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 + k 8uu)t2lymzplanet X where the accelt mu2 yl)+8ukzeration due to 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/d:8*vxvr czw.v bt:+1g ctk 1m)/jwwas on the surface of planet X where the acceleration due to gravity is .bd t:wj+ 8v)a 11/xz cvc:w*kmgtwvr$3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time i z0w ojq 2a0aj7 mk,cd fya-27e6jzx,ps usually greater than 0.10 s. If your friend holds a ruler between yjjpc 72ym7, 0o,60zqax ek fj2adaw-zour fingers and releases it without warning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a veloci/ h;t.vqc mwims7yui e-( *we.ty of 19.6 m/s. What is its velocity after 3.00 / u7.eyiv(*-wm;mqsw te . chis?

  A bullet shot straight up returns to 1gav-f f ll2o5its starting point in 19 s. What is the initial speed f-vl gl2f 51aoof the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it take)o-byaaus3o otdyj b5 5sy6x252 xh n;;o.xzn to return to itx;on.65 5ynoboz j xau3)o5sash;ydy2xb -t2s starting point?

  A ball is thrown downward fr50s8ifpsh vjmxr6(x 6om the top of a building with an initial speed of 18 m/s. j 5(r0sih s8v66xpm xfIt strikes the ground after 1.4 s. How high is the building?

  A ball is thrown straight up with a/(1bssofz 0hn1ff)ah speed of 30 m/s. (only fill in numerical value in the blanks)zs hhs0 )(fba/ 11ofnf
(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 spe;,qgfp:. as(g.x ; s vhxebry9ed of 40.7 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 11 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 11.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t = l ht)+gdf; fidblpn4-t )u)r+rg 9ej 21.0 s?

  In Fig. below, what is the velocitbbiy3eytg+;bo6z p 0+ y at t = 2.5 s?

  In Fig. below, what is the vzoa irgu:gfp.fo6 *6+elocity at t = 4.0 s?

  In Fig. below, what is ;) k;twt,me -ufut fk*the velocity at t = 5.5 s?

  In Fig. below, what is the average v8fivy0(;az cb 6mm (ugelocity from 0 to 4.0 s?

  In Fig. below, what is the average v0id :z7iyqbo9 elocity from 0 to 6.0 s?

  In Fig. below, what is the accelera 5oq ph14:0mursypata3s5 q1etion at 1.0 s?

  In Fig. below, what is the accelerat.m qbc,d x)wr4f;et-bion at 3.0 s?

  In Fig. below, what is the average accsm*(2ajra6quy6 / nbt eleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration (hwag9m l3bqw g.1/s sfrom 0 to 8.0 s?

  In Fig. below, what is ,cjtin::;zjt the displacement from 0 to 8.0 s?

Does a car speedometer meae1 xosv fbdydb*.t-;z)a a. f4sure speed, velocity? {speed|velocity}

  An object can have a varying speed if its velocity iz,qub +2 x)zzis constant.

  The velocity of an object can be negative when its aca+7pk 921, mhhsbmvmcceleration is positive.

  If one object has a greater speed than a s fb- 4;roz .v,4)t .v:p krypcn:zubbcecond object, the first must have a greater y.),uc4 ntzbrppkv. c bo;z f-4b ::rvacceleration.

  Two cars emerge side by side from a tunnel. Car A is traveling wicm rnw.ec+ y75gp1w 5fth 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 increasing in speed as its ac-t6h,q.j wrh 2qc fjy8celeration decreases.

  A baseball player hits a foul ball straight up into the air. It leaves tnf 10lhz5.g9 ifg xn)phe bat with agzl0 1.pifn5 f)gxnh9 speed 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 object speeds up, whatk en 41rkbnf 1og* +5mgwx8fk0 is happening to its acceleration, how does it change if air friction is ib8egfw*4x1knkf 1ko+0gmn r5gnored?

  As a freely falling object speeds up, what is lcn:7c;9abi+ jslzsj i+ kt21happening to its acceleration, how doeat+79ni2j1 bilcjs :l;sk c+z s it change if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to it)p:wx(5fo hc- q slfikd53:rgy i6nw8s original position with the same speed as it had initially if airo355y xq:cprgsf 6hifw )i d k8(n-l:w resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration x5j rw/lm)s9*smhv x 4at the same time.

  An object can have nonzero velocity and zero accebtu;if bz8p):0hyb)g iin2d4leration at the same time.

  An elevator moving from the secon t8 8xq-f 1u(dquul:gcd floor to the fifth floor making no stops along the way has u8ulq t18 (:fcx-ugqd zero acceleration all the time.

  A rolling ball moves frdq* qlds1n(. h(zrp9q om $x_1=3.0 \mathrm{~cm}$ to $x_2=-5.1 \mathrm{~cm}$ during the time from $t_1=1.4 \mathrm{~s}$ to $t_2=5.8 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.1 \mathrm{~s}$ is at $x_1=3.0 \mathrm{~cm}$ and at $t_2=3.5 \mathrm{~s}$ is at $x_2=7.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps4b/8,qu typtmf kr10as6 gnt; around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.9 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its trainerlzv m;w4pm-hg) 0ab )d in a straight line, moving 108 m away in 13.2 s. It then turns abruptly and gallops halfway back in 4.6 s. Calculate (a) its average speed 4wzb)0hd- l)avm; m gp (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 fro qi2a ap k 91:hpwc4lkck294bnm $12 \; m/s$ to $25 \; m/s$ in 5.0 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 from2jzxb ukl.tukp.831 w $17 \; m/s$ to rest in a distance of 77 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a s5 5h s8w2i*je ::x(j bydqrfkipeed 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 to essentiqnte* qut y qki; 9w.8mst4:t2ally top speed about wynuet ;*t tsm8q9i4: .qtqk2$10.3 \; m/s$ in the first 10.6 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 uniformly from a )h*+) bkmd/h 6ylmacespeed of $17 \; m/s$ to rest in 5.67 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skdx u;.hqi+t fhn6aow:s54 d(aid marks 92 m long on the highway. Assuming a fx(h oaads +n 5h:du6q w.ti4;deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck gxh3vu lg(x(2 qoing $25 \; m/s$ 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).    $m$