Suppose that an objectt* yt ;g1:6 whk sp8swhic2.dh travels from one point in space to another. Make a comparison between th t6ihs*; dg2s.8yw: cw1ktphhe displacement and the distance traveled.

  When is the average velocity of an object equal to the instantaneous velocity?/0 t9z3faaq(auc/x kr

  A new car manufacturer advertises that their car can go "from-nr/(1ib xpkk d/dm7h-0ptbm zero to sixty in 8 s". This is a description o(/d /bpxin0kmp1mbd-k- 7rht f

  An object moving in the +x axis experie 755sg;m x1fs:8cffk6m omwht nces an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to kk7cql01;cq p slow down as it approaches a tracq1kl ;qk70p cffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling tog7p* -diu0nlpsxwfm5s36h o 3 the West (-x direction) begins to slow down as it approaches a traffi *dfiul3s n657 mpx3pog0shw-c light. Make a statement concerning its acceleration.

  Suppose that an object is movm(2o1udpp vy0ing with a constant velocity. Make a statement concerp 0 d12muvp(oyning its acceleration.

  If the velocity of an objqj z3cl*+)h *zpekv3p*zt m4b ect is zero, does it mean that the acceleration is zero? Suppor*mqc v)blh4pjetz 33pzk **z+t your answer with an example.

  Can an object's velocity chang)h.dh or6wf 3ge direction when its acceleration is constant? Support your answer whfg d.3 6rh)owith an example.

  Suppose that an object is moving with constant acceleration. Make yf2*cwh .ata+a statement concerning its*a2+a .tfyhc w motion with respect to time.

  Can an object have increasing speed while its acceleration is decreasing? Supppa-ou)plj3*fu,k 4 x jort your answerl*ajpoj34,f u-u) x kp with an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice. Mac 5.qq+o 9 p2vjuuja4yke a statemenqj o+pq4jv.ucy 952 aut concerning its acceleration.

  Under what condition is average velocity equal to the 6ffn442cxxjo average of the object's initial and finxoxnfc 4fj462 al velocity?

  Objects A and B both start at rest. They both accelerate at the same ml:5s mes cxqm3gm*05azrv46 rate. However, object A accelerates for twice the time as object B. What is the fin 355mcmvelm4*m :rga s0qzs 6xal speed of object A compared to that of object B?

  Objects A and B both startxis*l ;ufl/ e- from rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A compared ef -l;u /*lxsito that of object B?

  When an object is releasedaczr) dd8 p8wr8,8dux from rest and falls in the absence of friction, which of the following is true conced)c 8xua pdz8 ,8dr8wrrning its motion?

  When an object is released from res,1zfti6s mpq 14l9zqsq)6df rt and falls in the absence of friction, which of the following is true concessqi9zdzfp1l mq4,q6) 6 t fr1rning its motion?

  Suppose a ball is thrown straightrg9j4+xyl2hd go5v -woqjloi2 *2 /e f up. Make a statement about the velocity and the acceleration when the ball reachesyo9 42-dj2v2golw gj5 o i+eqf /rhx*l the highest point.

  Suppose a ball is thrown straight up. What is its ac, 6cykzud3 slz8 mv g+e,eam+1celeration just before it reac,, ucvgm l+e1zs6ade +3y8z kmhes its highest point?

  Suppose a ball is thrown straight up, reaches a max: gsa18uc 4tfsno0vam,j2l,i kg10 poimum height, then falls to its initial height.n0t0 so p2,4icg,lo8ksva1 u:mf1 jg a Make a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls to its initia7la:e- zrldx )l height. Make a statement about the direction of the velocity and acceleration as the ball is coming down7e-: zx)llra d.

  Suppose a ball is thrown downward in the absence of air resistance. Make a stateou udl 8v1rkh6nnkek.q79)2 rment concerning its acceleraq1kehk. nunrvdul 8 )o276r9ktion.

  Suppose a skydiver jumps from a high-flying plane. Whhddb:.y1c 9x dat is her acceleration when she s 1 ydx9cdbd:.hhe reaches terminal velocity?

  A ball is thrown vertic9, yvm; psgf-nally upward with a speed v. An identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratv,gyn-f p;9 msio 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?)

  Ball A is dropped from the top of a building. One second later, +0x.+1 oebawt y j+nzups45*vj:q wiv ball B is dropped from the same building. As time progresses, the dap+vzywsto15 +vwi*jqbxe.j:+un 40 istance between them

  Ball A is dropped from the top of a building. One seco1e i)8sevyku1 k .n+uw4wx qy9nd later, ball B is dropped from the same building. As tie vk4kus1wy+yi8. e9u1q n)wxme progresses, the difference in their speeds

  Two objects are thrown from thz9jp60cg9 nh4r8r6qm ;mv bmv e top of a tall building. One is thrown up, and the other is thrown down, both with the same initial spej rrb p ;hg 0v4q669mzv9mnc8med. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick i99pg rczhw -7ds thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of 9r gdwhz9 -c7pthe two bricks.

  An object is moving with constanc(e 6ae dh2*wit non-zero velocity in the +x axis. The position versus time grapec6 hwi*ae 2(dh of this object is

  An object is moving with constant non-zero acceleration in the +x adzss* yle v n.28z) b368yndfoxis. The position versus time grsd.y8one )lvfnsd * b3yz6 z28aph of this object is

  An object is moving with constant non-zero velocity in the +x axis.0p r;l..d9xl orlj8 2 w3czucr The velocity versus time graph of this obj lp.rrz;.xc98l03lojdu2 wcrect is

  An object is moving with constant non-zero acceleration in the +x ax f clq.zilu7qa9hk 49b-*;hgk sli 5q4is. The velocity versus time gll9q .5c9-h iq4qahf*kbilk7s gu;z4 raph of this object is

  The slope of a position versus time graph jm q 0o lzv.9t2o)z(r,cng9pf hlks)q*i,9bhgives

  The slope of a velocx(o*pfbe /ude+s .4dp su8l 8nity versus time graph gives

  The area under a curve in an acceleration versh6;+b ba lvd8fus time graph gives

  The area under a curve in a velocityyb .)k:a/9u2ph otopo versus time graph gives

  If the position versus time graph of an object is a horizontal line, the object nuq7-rwn . uc,7nc un,q- ur.wis

  If the position versus time graph of am*i l+iih4 r4an object is a vertical line, the object is44*rii mia+h l

  If the velocity versus tl .1e4nq ou(u*opbh; y7vl z9ub0 egk3ime graph of an object is a horizontal line, the object i(boq y104ekb;h vzuugl eup o.9n3l *7s

  If the velocity versus time graph of an object is a straight linyfhvp8 sl95,f(y 1 ibwji e)cd,,ixg-e making an angle of 30 degrees with tysefi fv1yi,x8w,c jp9h(dg)-i5l ,bhe time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the distact7: )y1pfzyx i)sk 6jnce traveled )js fy y7x6z tckp1)i:and the magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long will it take to move 1 mzmff+mi(g 4 ss8.nl32 km i43.nfz( lm8mm +fgs supstream in a river flowing 6.0 km/h?

  55 mi/h is how many m/s?eoh jp+)mb9*7y-f8 z3ejf n kg (1 mi = 1609 m)

  What must be your average speed in order to it. e(bp9c88j dp0yyntravel 350 km in 5.15 h?

  A runner ran the marathon (a0uvmt65s wi+p 3zj2dgff92mopproximately 42.0 km) in 2 hours and 57 min. What is the averaff6m9 03m2t5p2uiszg jvd +wo ge speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to travel 400 kuq 4t5 ngpe /v+h14iahm?

  A ly (light year) is the distance that light travels in one year. The spe :wg :i:suwcx*ed of light xu si::g:w*wcis $3.00 \times 10^8 \; m/s$. 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 straight rb ;w iuf.2mf38 db+mfpoad and you look to the side for 4.0 s, how far 8.du wf;pmbm2 +fi3fb do you travel during this inattentive period?

  If you run a complete loop around an qn*+xl7q/i.6gpyl 2 w(mk krsoutdoor track (400 m), in 100 s, your average pki(nms.gq lx6+ / rw2yq*k7lvelocity is

  A polar bear starts at the North Pole. It travels 1.0 f8f/yeluql7,j x hs8ipj,:z : li+1eykm 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 ae1hz: ,j +lq,lsypuf:8/ij fylixe87verage speed?

  A polar bear starts at the North Pole. h7 tvm2.ipu8b It travels 1.0 km south, then 1.0 km east, then 1.0 vb7umt2 i ph8.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?

  You are driving home on a weekend from sc9qqnwkf )ck,it1q34 ehool at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How qkce9wt )3ifq4n,1 qk far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 kmsi8 umceh5 5mc:97 iwr/h. What is the average speed of the motorih 7em 5wi:sumc5c8 ri9st for this trip?

  A motorist travels for(8k.-ia .ksyrsg .ugc 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her average speed for tsgu c.aki (.gs-.yk r8he trip?

  An airplane travels at 300 mi/h south for 2.00 h and then atjea,2hgo8* )mma/llt p)0rd l 250 mi/h north for 750 miles. What is the average j)0 atpld* /a2 rl,elmg)h 8mospeed for the trip?

  In a 400-m relay race the anchorman (the person whn iu4y0s4njge z jey9y:n9.;ao 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. Wha4; y 9in4 jjya.n:09eeynzs gut 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?

  A car decelerates uniformly and ci qrwpb6-1sod+ s,t:h 4vcv 8o 8i(monomes to a stop after 14 s. The car's average velocity during deceleration was 30 km/h.ovp:o + mh6sqd81t-n 4c,(rw io8vi sb What was the car's deceleration while slowing down?

  An airplane increases)) u dpgzwlyi-4(s; ft its speed from 100 m/s to 160 m/s, at the average rate of y fp;(t4g)u-swldzi)$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelera7j :7ataf:9noy3lze-w *neat tes 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?

  A cart starts from rest and accelerate:b q8mz,clwf 0)ih vy6b3y rtxrf(3i).e9efh 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 z /emy l50qnie;wtx df68: wa*10 s. It then speeds up with a constant acceleration o0 :wm 8iftal*56xwnz/eq; deyf $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velo vyq (fo4wg+)ab-i;kqcity of 3.1 m/s experiences a constant acceleration ofwbv -a;gi4yq kof()+ q $2.9 \; m/s^2$. What is the cart's displacement during the first 4.6 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a s.4dl sq3p- lmlpeed of 313 m/s strikes a sandbag and penetrates a distance of 52.13 cm. What is the average acceleration, is4dlmp 3lq.l -n $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapultskx25jsw *s gwwm36; -) elo0oizj-uf on an aircraft carrier. It reaches a speed of 42 m/s at zjo;e-lsi s6* mk -sg2uwxw)o0w 3fj 5the 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 constao 1 37r+ 8lnbnobh4yncnt 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 m/s in a distance of 200 m. What jgsud/y ,dor ; i2,qsbey )*n5 inn+o)is its average accelerat ,q)s5dnrn)n*bg2; o iy+uosed/ j,iy ion?

  An object starts from rest and undergoes uniform acceleration. n4jrd+snh; b7 :q 0onc During the first second it travels 6.9 m. How far will it travel :hs 7 d non0q+rcn;4jbduring the third second?

  An object is moving in jpynn cyk*(ou69yph0lsk: *2a straight line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m( ncyjy6n*op*y 2kl s: 9hpu0k/s. How far does it move during this time?

  A car starts from rest and accelerates uniforml-7 ha w.yrivh gy*1ekqk/v-t/ y 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 /uh+ucsa,,,)jtcq2 *qllh yf xgyd 445 ajiv 9decelerate 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 that has been jx. +a1ul/ujs- wmcu-waiting at the interx.juu u sc+j-1ml/- awsection 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 upwapb3id 08ddf:h2 ,iayn rd with a speed of 12 m/s on the surface of planet X where the acceleration due to ai:3p id8fb2,nhy0d dgravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with q7.dp(kbuoiumbk8 3 +e6k.dc a speed of 12 m/s on the surface of planet X where the acceleration due to gravkqe.7mku6i8cudp (kbbd3 . +oity 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 planet X whekmf-, f /v6n)plp0y q07z kawxre the acceleration due to azx 7y/0lqv kf0)6 mwf-,pnpkgravity 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 surface of planet X whe5xzf+uq/2owqxdhi.z 3p03n y w igb1 (re the acceleration due to graviqw3b+z upxd/ .iz(0 y23x 1qnwigf o5hty is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually great ,xy kf5cxky122c z j9sez1oh)er than 0.10 s. If your friend holds a ruler between1 yks2) zcx1jc5 ,9yk2feoxhz your 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 velocity of 19.6 ( jptpy-tm u5+m/s. What is its velocity after 3.00 s-ypttuj+5 (p m?

  A bullet shot straight up returns to its/))h ( l yneh9(g7u+zr(vdyo q rcr0sb starting point in 10 s. What is the initial speed of the buqzl (br7nu d)g0 y(r eor hs/c9+h)vy(llet?

  A ball is thrown straight up with a speed of 36.0 m/s.l(+ t4s/ +tpi74 emdsdo4 zonv How long does it take to return to its startin s(/+toveo4 +it4s7mn 4dlzpdg point?

  A ball is thrown downward from0hww)y+qk7ep0 da 8xnwx* qz; the top of a building with an initial speed of 23 m/s. 8q700 nhd k awq+)wx;wy *xepzIt strikes the ground after 6.7 s. How high is the building?

  A ball is thrown strax+;en i*ib-n16:ec 6oedpl rddr jy.4 ight up with a speed of 30 m/s. (only fill in numerical value inyn cd xbi+:64pe * oinde1-6.er;j drl 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?    $m/s$

  A foul ball is hit straight up into the air with a speed w:;4z wnhe3j6 f to,cwof 30.7 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 12 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 12.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is theoh2v n 5koj)dy r +/tdjk:rp): velocity at t = 1.0 s?

  In Fig. below, what is the velocity aj/4v*gf9 2ds0wdt 6ukxu qo( 7xknvo( t t = 2.5 s?

  In Fig. below, what is the vel;hxuxu8g zv7yxa 7v-(ocity at t = 4.0 s?

  In Fig. below, what is the velo) oiex ,+l( lavu /jzoi85mvj0fld1.j city at t = 5.5 s?

  In Fig. below, what is the average velocity from 0 to 4.0 s?yxsj. jp 6v5x a2vb+j8

  In Fig. below, what is the av-,l;- vpca:v/p*t xqdoj (st berage velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration a.b,f,*gx 7ufu m v*oeit 1.0 s?

  In Fig. below, what is the(p8 yez1t;ewhozk 7 8s82 cpfi acceleration at 3.0 s?

  In Fig. below, what is 5 yrqv.l;6//yvw 7.nmg jfhazthe average acceleration from 0 to 5.0 s?

  In Fig. below, what is the average a9cl)h.c z k 5oy*ng(hmcceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 t ksipayjbw 9xmq+47+7 5zdna9 o 8.0 s?

Does a car speedometer measure speed, velo0g+5otrqateli+ 1q.pcity? {speed|velocity}

  An object can have a varying spee .29rq 2(h r8jdfwq dtduh:d+kd if its velocity is constant.

  The velocity of an object can be negativabf +l;*po ;nfe when its acceleration is positive.

  If one object has a greater speed than a second object, the7i4jt;+yx3 b r8 i8o8 msdigxkx1v+qt first must have a greater 188+td+3 i syimjxq78vkob 4xxg i ;tracceleration.

  Two cars emerge side by side from a tunnel. Car A is travelinhq(+:kbme.-igy p+i; siw 4u hg 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 increasing in speed a8bd2gom(srcc81ce* cs its acceleration decreases.

  A baseball player hits a foul ball straight up int-no d1uprh8e: w qkn,:o the air. It leaves the bat with a speed of qoh : 1r8,ednk:pn- wu$120 \; km/h$. 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, what is happening to its accelz.(/w wrwtob,+ugjr .*uz(6 tp +sb1rkv 8l azeration, how does it change if air fricta *p wr..v1(lusbjbtz+kow6 /8rutw+ ( g r,zzion is ignored?

  As a freely falling object speeds up, what is happening to its acceler4oi*pj;ba t 08qizx y.ation, how does it change if air friction CAN NOT be ijz*tb0 x qio py.8i;4agnored?

  An object that is thrown vertically upward will return to its original pos,s9b6/ zjbr w;vyl;y:dh s3m qition with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this resulwqb:l ;,6js/ ;hz d3 y9svrymbt be altered?

  An object can have zero veloc- l.lsh4vt fo-ity and nonzero acceleration at the same time.

  An object can have nonzerge gvm,-b).1bbf r6 z6ptj)ht /y)gwy o velocity and zero acceleration at the same time.

  An elevator moving from the second floor to the fifth floor making no stops al(wabhgm +xcq ;tgb/ 59ong the way has zero acceleration all the time.x9+;agb q5gbwh mc(t /

  A rolling ball movesh9s g-4m wd13 juzpwq7 from $x_1=2.5 \mathrm{~cm}$ to $x_2=-8.1 \mathrm{~cm}$ during the time from $t_1=2.9 \mathrm{~s}$ to $t_2=6.1 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.7 \mathrm{~s}$ is at $x_1=3.4 \mathrm{~cm}$ and at $t_2=3.6 \mathrm{~s}$ is at $x_2=7.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complela9w3s ;hohb,yo(/jnodj w ;)8omuf ,te laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 12.1 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its tfg+ vq4dj (tralvc-,4h-h ao 9rainer in a straight line, moving 92 m away in 13.8 s. It then turns abruptly and gallops halfway back in 4.7 s. C -dcvfta,lh9q+44 vrag-(hjo alculate (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 fr.41o9w pqtm+t cvr8s oom $11 \; m/s$ to $22 \; m/s$ in 4.7 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 fro5b74puwab9m q m $18 \; m/s$ to rest in a distance of 62 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a,r+a t t4xjoak)o.3:edo4 bdjx uvz+ 9 speed of $29 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.0 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the bpkcds8zm- e 415i )bzalocks to essentially top speed about d pikz5 ac)em s-zb184$11.3 \; m/s$ in the first 12.6 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 fokj- /9nig;k5)wwh icrom a speed of $17 \; m/s$ to rest in 4.77 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 highgk8)j+ 30on 3 n1vn.gyx c- +sstdnigcway. Assuming a d. nsi )n0x-3ds+o+gctgyjv k31ng8 nc eceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truc(e zi rufq09b,k 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 0z hj80gkg;a fgj5,vk c/z2llless than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. ;clg5lj j,a k2/ghgv f00z8zkThe runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$