Suppose that an object travels from one point if;kfa :*0e wtcn space to another. Make a comparison between the displacement and the dist ;:ektf wacf*0ance traveled.

  When is the average velocity of an objectm - baj67ppt1fdzw 2k5 equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "fc ps.y2blb)r (tal5jco7 1p;irom zero to sixty in 8 s". This is a description ob71por)(.jt i 25pllc cb sa;yf

  An object moving in the +x axis experiences an accel h6c8uodi 7doxlewg; 28h- u3r1f,cemeration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to slow dow sstg e2izgy;9euf -*6n as it approaches a traffic light. Make a statement t2;g*z fs-6y uge sei9concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slow down as2j, ic3moezm 8 it approaches a traffic light. Make a statement concerning its a32,e jcomzmi 8cceleration.

  Suppose that an object is moving with a const- x.:xqq c4jhxpg0))ig *zrnkant velocity. Make a statement concerning its accelerahgg 0rqxxn)c4)-: jip zxkq.*tion.

  If the velocity of an object is zq 6g*q xg2vu6lero, does it mean that the acceleration is zero? Support xgvg62qu* 6qlyour answer with an example.

  Can an object's velocity change direction when its accnbhpx: tl ;d(719lp(fhhn 6wyeleration is constant? Support your ans(pyn 9 hbfp tl;ln w(hh6d7:x1wer with an example.

  Suppose that an object is moving with constant acceleration. Make a ql..fixz +(vto6jo6y statement concerning its motion lovq6f+ .zi. ty6(jx owith respect to time.

  Can an object have increasing m /-eeuvtkk2t0l efhh n +9gu/2- ani,speed while its acceleration is decreasing? Suppor kk+-lu2vi/fh math / 9n2,egeunt0e-t your answer with an example.

  Suppose a can, after an initial kickvq ;cyi 7+3zdz, moves up along a smooth hill of ice. Make a sc3i7y +dz;q vztatement concerning its acceleration.

  Under what condition is average velocity equal to the average of th er2:z4b.qx; b0gq qdoc/fool5.xq o0e object's initial and finaleqo2qoqx;0blc5 0:xg4rq bof/.d. z o velocity?

  Objects A and B both start at rest. They both accefa )oyvw0mi78 lerate at the same rate. However, object A accelerates for twice the time aso 8v07)iyw fma object B. What is the final speed of object A compared to that of object B?

  Objects A and B both start from rest. They both accelerate at th;9sm1j/xvvzwjbj ( ne c-;h8 ae same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A compared to that of objectc 8;vj xw(s1e;h-ab/ zjjv m9n B?

  When an object is released from rest and falls in the absence of friction, whicg+ r-t3qqdz2ph o32- tqr zpqdg+f the following is true concerning its motion?

  When an object is released from rest and falls in tisa:l (s0m4vw he absence of friction, which of the following is true cosl0:4w(a sm vincerning its motion?

  Suppose a ball is throwh3hnsxt) xo07w/k6m (ru5j, ub4t iycn straight up. Make a statement about the velocity and the acceleration when the 7(syhikt tu6xbhnmu rxc)5 oj/,034wball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration just before it r9 a/jrtz8ivxjw* ..cp eaches its highest .v8 wp .9t*xjijra/czpoint?

  Suppose a ball is thrown straight up, reaches a maximum heighty g eu7-yp3- zketx(b*, then falls to its in7g kye zu3y(*txp -eb-itial height. Make a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, . e vx6p;qjko;dsom 4c nowsp24v*24wreaches a maximum height, then falls to its initial heicv;x24 jo 4kpo2.e m vopw4dqs6s n*w;ght. Make a statement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown saod-s gr, c ybf,- 6ap3sw0b5qqi1z0 downward in the absence of air resistance. Make a statement concerning its accelerob0-b0sy ,f3w 1-zrg6iqqp sc,s5d a aation.

  Suppose a skydiver jumps from ci/ 1v43eejvs a high-flying plane. What is her acceleration when she she r1s3ev/ jec4iveaches terminal velocity?

  A ball is thrown vertically 8kz *wf0u g.adupward with a speed v. An identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum heigg*8 zufw .a0kdht 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. Oneaul/4httr/at b, (qu( second later, ball B is dropped from the same buildiuqta((r4ha/ t b,u /tlng. As time progresses, the distance between them

  Ball A is dropped from,3zk*d 2. omyk d a2w9+rauxse the top of a building. One second later, ball B is dropped from the same building. As time progresses z*oka2s+, a 2x kywurd3me.d9, the difference in their speeds

  Two objects are thrown from the top of a tall b 6tu z2mv,1drjlxv.)a .p9*itij y:wa ,,qd ayuilding. One is thrown up, and the other is thrown down, both with ttyl1m tii vx,)jqz*6 p ,:yaa d.u9rj,w.2advhe same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a builpul79.d3nb*k 9ttym5 - t d n*/t77 biyuaqqnnding. A second brick is thrown straight down from the same bt-79p kunuq y*lm*nnb.d7yit/ qt57t da39nbuilding. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. gizq4ow) yomydc 6 oe/f9g8 90f+3kplThe position vg43ff9 8o/cilk)gzd9oe+m6o qp yy w0ersus time graph of this object is

  An object is moving with constant nmau/u( 5vrjxc v+) uc oesv065on-zero acceleration in the +x axis. The position versus time graph of a5evcu jx 0 or+v5/u s6)(cmvuthis object is

  An object is moving with )q/lc9ulfi 7x constant non-zero velocity in the +x axis. The velocity versus tl)ufqx 97ilc /ime graph of this object is

  An object is moving with constant non-zzh*u-ehwa * r/ero acceleration in the +x axis. The velocity versus time graph of this objec*/ r*zeuhhw- at is

  The slope of a positiot12 veu-f(cxu n versus time graph gives

  The slope of a velocity versus ar1)i0- ax1 bqyn)amico;y-u time graph gives

  The area under a curve in an acceleration versus time graph y1fh y 9)tvao1gives

  The area under a curve in a8 - ug;2yjsqz l9i5lpq velocity versus time graph gives

  If the position versus time graph of an object is a horizontal line t ioxqs ,2ntc9(gopm3s3-t;o , the object it i;pn 2, q-tt(o3o3oscs xgm9s

  If the position versus time graph sbs.dcgdi0r-a3tw+c 6pd2b8of an object is a vertical line, the object isga2sb6 bi 3r d.tdp8cs-0w+cd

  If the velocity versus time graph of an object is a 1q(oxj9)5 uxoucurda*g6d6a ;:xg sz horizontal line, the object 9x u6(ao o5;6xsr 1xug cdud):zqajg* is

  If the velocity versus time graph of an object is a straight line making ana 9b1ryhl *hxn/3k6lmll18 id angle of 30 degrees with the time axi9/1*m khi8hr3nl6 ylxll 1b ads, the object is

  An object moves 15.0 m north and then 11.0 m south. Fi3mc 2;t7snmg ncs.*bsnd both the distance traveled and the mcs3s gcm n;n2*sbmt.7agnitude of the displacement vector.

  A boat can move at 30 km/hhmptj 3g /ht14pf rt 6sq6y(t/8yfke0 in still water. How long will it take to move 12 km upstream in 6h(tfghy6 fkt13tr t 8eps4p/ /m0y qja river flowing 6.0 km/h?

  55 mi/h is how many m/3b c1zhs.gyo4 s? (1 mi = 1609 m)

  What must be your average speed in ord -wi( lsy3tbgo0s 5:uber to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42nqq/ rv)dhthbi 2cmx5+0 ,m p9.0 km) in 2 hours and 57 min. What is the average speed of therpxm h59q+t )dm b0/hn q,vi2c runner in m/s?

  A car travels 90 km/h. How long does it take for it to travel 400 km +qfn :u9lr/gi(j9 n- h+xcttb?

  A ly (light year) is the distance that lighl ros7okz9x4tmu-n q 5(0 pr/it travels in one year. The speed of light rlusi o( rk/9q75t-xm0zop 4nis $3.00 \times 10^8 \; m/s$. 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 road and you look to th : ak wcdvp6c1 ey.8i1dcw)8ope side for 4.0 s, how far do you travel duringw6od: 8acpy kw 1pi.1c)cdv8e this inattentive period?

  If you run a completenmxwcm)5ilukh4v0apx+xlw, 47n 7 n: loop around an outdoor track (400 m), in 100 s, your averag 0nxuw,5 :i 7mxh)vanwmknlx4plc47+ e velocity is

  A polar bear starts at the North Pole. It travels 1.0 km south, -on*mv0/dyu lthen 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 wud0ml*n/ ov- yas the bear's average speed?

  A polar bear starts at e aq q25chs.l9wqht16the North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km nortchh qwqst1.2aeq5 l9 6h, 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 school at 55 mi/h fozj1m*a: o.rgw r 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minut:g.o*w1r zj ames. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 1a gd*ncg d7 0:;2 q-2xbnhvgnj60 km at 100 km/h. What is the average speed of the motorist for this trid7:h *g canv g20x;-bndj2gnqp?

  A motorist travels for 3.0 h at 80 km/h yy+l:9in *g xjand 2.0 h at 100 km/h. What is her average speed foryn*x9ly:ig+ j the trip?

  An airplane travels k- ackx*j9v* tat 300 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. What is the ac9jak*x-t k* vverage speed for the trip?

  In a 400-m relay racecz2bs18l,+-p o uh +fn+i 0vgco kx3a.mx w1pg the anchorman (the person who runs the last 100 m) for team A can run 100 m in 9.8 s. His rival, the anchorman for team B, can cover 100 m in 10.1 s. What is the largest lead the team B runner can have when the team A runner starts thxsu+,c8 3pok-cph2ogzm g+v.ba+i 0 f1nlw 1xe final leg of the race, in order that the team A runner not lose the race?

  A car decelerates uniformly and comea jtog- hf-55ns to a stop after 10 s. The car's average velocity during deceleration was 73 km/h. What was tha n-jhgo5-5 tfe car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at thexa nxw ;ipwji mc 6ys5/v ;gd50uh-/7y average rate of g/;py jwwh;dcy0 /5n7u x-m6x iva 5si$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rate h2n (alidy3 9fof $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from rest and acrzzqb: *0)vvmm7d9 f ncelerates 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 )ss2;g1bx*wk ty msz, up with a constant accelerationbgym)zt*s1k2s x,ws ; of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial vu qr9/fh+xw p0elocity of 4.0 m/s experiences a constant acceleration oh9qxr/0 f+wupf $1.0 \; m/s^2$. What is the cart's displacement during the first 7.6 s of its motion?

  A bullet moving horiza)w na/ dctd0ci+g7, iontally to the right (+x direction) with a speed of 476 m/s strikes a sandbag and penetrates a distance of 52.11 cm. What is the awia/cgt 0caddn7 i),+verage acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is8g40uupa z7sy ni: cwtwax* +: launched from a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the accelerwspz4+w8 :g* t0:c yaanixu7uation is constant, what is the length of the catapult?

  A car starting from rest moves with constant naje.;3l+r9*1l guy5zwb v t oacceleration 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 de/r b6*r:qplv k0cw)yit2.6k sg s8m m/s in a distance of 200 m. What is its average acceler)sr/d tk:26 m.lic eg0ypb k*q6 r8swvation?

  An object starts from rest and undergoes uniform accelerati 4r0p h nou30rsyn2g5pon. During the first second hppr 04r3n 5ns2ugoy0 it travels 1.2 m. How far will it travel during the third second?

  An object is moving in a straight line w 3mar)j2:af zsith constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How farazs)a j 23:fmr does it move during this time?

  A car starts from rest and accelerates unifog aym+*u7fs 2-cshk wnq sjao)4j4;* irmly 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 ro,nvdjewl1qa 8 - a-w2egk6q 2qad 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 h3oylyuj:e0* wy:ui/7 b kx9icar that has been waiting at the intersection starts ahead with a constant acceleration oki0be o9*lu x/ui:3y :jyy7hwf $2.00 \; m/s^2$. 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 on the surface of planet X wh2;bbq/9okv 2vt4jvsv-cz d+uu qf, 8rere the acceleration due to gravit;9s2b-j k vfdvb,rc4u8/uqtv+2 zoq vy 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 k : xtz8nfmh y( 3,8xn+vi.thcthe surface of planet X where the acceleration due to gravity is t8x8f.kh (z, v+ xh nnmiytc:3$1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

  An object is thrown uiuf;4s:dir7g 54 7 vd ey5k xd.dpz5jepward with a speed of 15 m/s on the surface of planet X where the acceleration due k 5iddddfuz e. j vip;r4g4se: 7557yxto 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 surface of.y towlgqkbro +6mf :d/ qb hwr,;7(m3 planet X where /rkgly.whqbq b(;tof7 3d wmrm,+o:6 the acceleration due to gravity 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 s. If your friend holds a rulewl r4xvf*k +q8/z5o4wswz)ugr between your fingers and releases it without warning, how far can you expect the ruler to fall before you catch i4 fuowwxrwl z *5z)/8vs4k +qgt?

  A ball is thrown upward at a velocity of 19.6 m/s. What is its velocinn1 7(kbjgga x78u jc)oao3k )ty after 3.00 s?7)j( xcaj17)ugbo 3an o kgnk8

  A bullet shot straightf ma h,o-;dk.d up returns to its starting point in 13 s. What is the initial sp-omd ;fa,dkh. eed of the bullet?

  A ball is thrown straight up with a speed ofb14nydbenqg;*gl 0 / f 36.0 m/s. How long does it take to return to it0b1;gq f4nb* le ndy/gs starting point?

  A ball is thrown downw54lksxs8j *gl ard from the top of a building with an initial speed of 6 m/s. It strikes the ground ks*jl48l5 xsgafter 2.6 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fil cmj3xc::l5hpvl v3f) l in numerical value in the blanks)h3x:jv m:p) flvccl 53
(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 wiy c :3 gzkj5haj6lcc (.j.po6oth a speed of 38.9 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 1 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 13 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 13.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocitmo;bp u0;h dij:lgu :8:gfzpji 2ymk85b8s. ly at t = 1.0 s?

  In Fig. below, what is thd bks 77 nun*77rmjsz*e velocity at t = 2.5 s?

  In Fig. below, what is the velocity at 396n-urkw y09 yhm rvat = 4.0 s?

  In Fig. below, what is the rv ()og/3lug n:18ve5kbmwk7h z wu.avelocity at t = 5.5 s?

  In Fig. below, what is the average veloh9i9 aeil2f; a 9ugvo-o sz8t1city from 0 to 4.0 s?

  In Fig. below, what i6 hbtb(9jhu ejj(m/54.xzxnr s the average velocity from 0 to 6.0 s?

  In Fig. below, what is the accel**ooba vlr q:u+ )s6fperation at 1.0 s?

  In Fig. below, what is the acceleration at 3.0 s? 97p,qovq5yns t/q9 mz

  In Fig. below, what is the average acceler 2lop fwsr)3 1qb,8zkaation from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 to 7 oyt.h (zp4llrsqjlo//f-5f5uy u7h8.0 s?

  In Fig. below, what is the displacement from ih6lr y6l.ks*;c) fprnj+ )ou0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|velocitn2fo8+w5ar-v2 r6wbmah zrb3 fg 7i(sy}

  An object can have a va /8o ubvn)(.1h+ gs:raejb7h uldt/vaa/ xew,rying speed if its velocity is constant.

  The velocity of an object can be negative when its ah gcg;d7zy8 td*0adz ,cceleration is positive.

  If one object has a greater speed thpn+d;hy+hmz mfxrw/+z;;ftq .9 - ghxan a second object, the first must have a greater a .gyqnh+f+9xt;;wm; x-dzrm /h+z h pfcceleration.

  Two cars emerge side by side from a tunnel. Car A is traveling with a r9eqfj-z9n sd); bf;k 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 acceleration decr1rsq d -w1)9ygxl.lq* i7b;l7mh uz 7qdg5lhseases.

  A baseball player hits a *xxepdsvh 405m jit 96foul ball straight up into the air. It leaves the bat with sj45etdxx 9v*imh0p6 a 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, what is happening to its /a5kzxgz 5-g7kdccu 8 acceleration, how does it change if air frictik8zcz5gk7gad/5 xu-con is ignored?

  As a freely falling object speeds up, what is happeninb 9y7ou;fh*hygvx* 7dg to its acceleration, how does it change if air frictiodh;7yhxobv9* y f*7gun CAN NOT be ignored?

  An object that is thrown vertically upward will return to its original positio2(zpjw.5ezq+2 y4gt pz k1kl e2i8bax n with the same speed a exk2i8. 2e25k(bzw14 zpjpy+g qtlzas it had initially if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero veloc9jp (lnex t wckbv8 vzw1cb9m8.q05k-ity and nonzero acceleration at the same time.

  An object can have nonzero v aw6 4bwg2umvd094b)w upz ;yrelocity and zero acceleration at the same time.

  An elevator moving from the second floor to the fifth floor making n;jy1x i+ctscill *:q6 o stops along the way has zero acceleration;*6lyq+cc sxli1i jt: all the time.

  A rolling ball moves 0(epv))qjdudcy*/1 d /5vng zyh dkah 861eewfrom $x_1=2.7 \mathrm{~cm}$ to $x_2=-8.7 \mathrm{~cm}$ during the time from $t_1=1.8 \mathrm{~s}$ to $t_2=5.6 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.3 \mathrm{~s}$ is at $x_1=2.1 \mathrm{~cm}$ and at $t_2=4.0 \mathrm{~s}$ is at $x_2=7.9 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps aroun2js/ pg i ,ib9hq paq b.t6c,3bcf85bud a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 9.6 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from itsw9h;gajfxnrzf tyy/pl/d7/353 vqn : trainer in a straight line, moving 93 m away in 11.4 s. It then turns abruptly and gallops halfway back in 4.8 s. Calculate (a) its arq9 /g :jvy3ft;/w yf zn5la3n/xpd7hverage 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 q.r1yt*psq6u2i nah ig+:dm -$11 \; m/s$ to $23 \; m/s$ in 4.6 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 from ,gym7 vvpa x2f38tki( p/0nsx$18 \; m/s$ to rest in a distance of 62 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach/iq+m6d lmck3udknol )np29 h+ h5 q7u a speed of $29 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.8 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks twg9r- pv yp1-bo essentially top speed about wvp-p1b gyr-9$10.9 \; m/s$ in the first 12.1 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 speed of xc:y3 /z4 ywus$18 \; m/s$ to rest in 4.36 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.kogr lg +tb,xh0 *q2gpu89 hr. Assuming hql guh ptk9r8b*0,o+xgrg 2.a deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck gznwk. nme+p:u * 1fl2ia 9:fvvoing $25 \; m/s$ 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).    $m$