Suppose that an object travels from one point in space to 0r 5o/m2 ,yskt+2rkuth r-z 4liv ebm7another. Make a comparison between the displacement and the ,r4y v kt/+ts52 om7b- 0zuih2krmlerdistance traveled.

  When is the average velocity of an object equal to the i0r(i dg7vswy ocbn) ,/6olikqul -+ 7lnstantaneous velocity?

  A new car manufacturer advertises that their car can go vx.cxbvy( r kj72kc 05od-f :w"from zero to sixty in 8 s". This is a desc w02ccdbrx f yk7o-x5v v:.jk(ription of

  An object moving in the +x axis experiences an a 4c5fknw,th 8bcceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x lgn2tl ,s +zon/0h)h cdirection) begins to slow down as it approaches a traffic light. Man +shhlg/z2l0c )on t,ke a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) be.i .e;o kpv shcfap20;kh z.f)gins to slow down as it approaches a traffic light. Make a statement concerning its)a..; k 2offkp i.zpvsh;0hce acceleration.

  Suppose that an object is moving with a constant velocity. Make a statement con4,26yq hsr56w zvlmxvcerning its ac6r45hq,6mls2w vy zvxceleration.

  If the velocity of an object is zero, does it mean rdbu6jhbe/4a9d-5ca)ek q6 z that the acceleration is zero? Support youkba4razd/ud5 c-6e9) b jhq6er answer with an example.

  Can an object's velocity change direction when its acceleration is conqh /am v(6;wo+3wnh51fqyemm-j xow 8stant? Support your answer with an exampleo-h5j + am wmowevm6f8hwqn 1yx3(; q/.

  Suppose that an object is moving with constant acceleration. Make a stateme)isvaue .,p0 p9oc:hhqwvk7 )nt concerning its motion with respect k7s)oahi) .puv9 ,hc 0:epq vwto time.

  Can an object have increasing speed while its ad oue2 g0(9sykdj2;p0 fag( egcceleration is decreasing? Support your answer with an example.fp d29(o;0e2yeg0gaugd( skj

  Suppose a can, after an initial kick, moves up0qmjxdqh(e at.yt, 08 along a smooth hill of ice. Make a statement concerning its a a0 t yj(mqte.qx0dh8,cceleration.

  Under what condition is average velocity equal to the average ofg*m77b yu0gbj3wxw a 0 the object's initial abu7 7mb0gw3yx gwa j0*nd final velocity?

  Objects A and B both start at rest. They both accelerate at the same r2lln/(z-w maaate. However, object A accelerates for twice the time as object B. What is the final speed of object A compan lla-2/m(waz red to that of object B?

  Objects A and B both start from rest. They both accelerate at the same rate. q mfj)o/:/mwo However, object A accelerates for twice the time as object B. What i: /o)wjfm/q mos the distance traveled by object A compared to that of object B?

  When an object is relea a/*-dz.d r-o kpx6egfsed from rest and falls in the absence of friction, which of the follow x -6*az./pgdd-k froeing is true concerning its motion?

  When an object is released from rest and falls in the absence of fricti)bzl(i p swj0 (u/ls;ton, which l(b t lu)s 0/wp;sz(jiof the following is true concerning its motion?

  Suppose a ball is thrown straight up. Make a a4tbb5n/ b0t z9ny2lzh 3: hd/dbq)jez k)r-jstatement about the velocity and the accelerati35y kdbahjld2/bn9:bzjhrqt0)4 ze t/ -nz) bon when the ball reaches the highest point.

  Suppose a ball is thrown straight up. Whdi*e00julpe urdhk i 299j,2 kat is its acceleration just before it reaches its highest poin 20h2ie urp*, e0kl9j ikd9udjt?

  Suppose a ball is thrown straight up, reaches a maximu.0gle oc,uw+4alq,p(w7aza bm height, then falls to its initial height. Make a statement about the direction ae,ag+,(zb4 0 .llqc7aopuw wof the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches tg nzdlx5e l7g8zlo( e4/7 eaem+;y2g a maximum height, then falls to its initial height. Make a statement about the direction of the d xell2;egm8/toyzln g4+ ag7(e 7ze5velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward0t zj0 a: yzxnua+eeg.qi005n in the absence of air resistance. Make a statement concerning tqg xizz0nyu n.j0e+aa 5:e 00its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her ,ze3d y*pta x0t3 y-hitc(q.aacceleration when she sheq teht0-ayiy 3cpx,*t(a z .d3 reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical seco+v2nqg)w3:ekmn/i* eqc p l+ond ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maxi 3*knqg2+oqlpe vi/nemw c:)+mum 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, ball B is2/xc1ra4 zn elmz:3)a2kp yli dropped from the same building. As time progresses, the distance between thera x/2zk ecl)n il4:p1a3m z2ym

  Ball A is dropped from the top of a building. One second lateruc.9xhxh 6m5ad:a ak+, ball B is dropped from the same building. As time progra+ .:m9 a5chuxa d6hkxesses, the difference in their speeds

  Two objects are thrown from the7ur cktw:w ttkzm06a./ hu84n)n+hb o top of a tall building. One is thrown up, and the other is thrown down, bu0tw)8tum/zh.7kk no rahb:n 6ct 4+woth with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a buuo* cg wfj6.p+p1 jrg0ilding. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Crwuf1j p+c*gop.jg 06 ompare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. The positqv19mb+ v2 pei;rl. nf/q,vhbion versus time graph ohqbfv emb; ,lnq 9vir/1v+p.2f this object is

  An object is moving wi ;; ,v;etdrnwbth constant non-zero acceleration in the +x axis. The position versus time graph of this objebd ;r,;vnwe;tct is

  An object is moving with co rrdxe (v-03 a+-pgtymnstant non-zero velocity in the +x axis. The velocity versus time graph of thisdtrrm ygp3v 0-aex(+- object is

  An object is moving with constaq4* dpayl1we;kd4du x)h5m0bd-y oe 2nt non-zero acceleration in the +x axis. The velocity versus time graph edqdl0od y my15-4a2k;4u)*hx ebwpdof this object is

  The slope of a position hs77 (6d82 fhlkq gjufversus time graph gives

  The slope of a velocity vw vo/ti 2hnu.7g-(0dot6af cl cz8g,rersus time graph gives

  The area under a curve in an acceleration versus time 6w1cq/z )zrwk graph gives

  The area under a curve in a velocity very.(qip 8exuh/ ;fnex9sus time graph gives

  If the position versus time graph of an object no801v84(vrlo w okzqis a horizontal line, the object (ko8wl1v z on0v4o8qris

  If the position versus time graph of an object is a vertica+l/ccu +c s-mul line, the object is su/ml+u-cc+c

  If the velocity versus time gr+e :p;s2 4n+6 n-eos i khi7dddje5nphaph of an object is a horizontal line, the object isdk 4n6ph iesp n od ;5-ehj27:snde++i

  If the velocity versus time graph of an object is a straight line makinfq7 dn87rxm2s g an angle of 30 degrees with the time axis, the on7s xd8r7qfm 2bject is

  An object moves 15.0 m north and then 11.0 m soutwnxen4u*4agj ./c w8bh. Find both the distance traveled and the magnitude of the diw c x.j84unb ag*/w4nesplacement vector.

  A boat can move at 30 km/h in still water. How long will it take j mwi0lu)bf:fq;wo 2 cbe82)k to move 12 km upstream in a river fk;jwu ):)ce0l8o2bf b wqif2mlowing 6.0 km/h?

  55 mi/h is how many m/s? (1 r)zz e 0po6dd7;hxn9q mi = 1609 m)

  What must be your average speed in order to.b ptoe+cnhj 47h *zm3 travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours anrl5 986l(ica w v4 dlqado:q7xd 57 min. What is the average speed of the run: c(l5aq8r9 ov4d qawl7i 6dlxner in m/s?

  A car travels 90 km/h. How loja)s /2mro7 vhv c5m/xxg-*jd ng does it take for it to travel 400 km?

  A ly (light year) is the distance that light travcx2 zp.c/ tqj;n nbxskzjwok0,10 31eels in one year. The speed of light1.bw x csn0k t1zxne,cqzjk2/pj 3;0o 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 straight road and you look to the3(g*o )d. g 4qjig :plrga4hrm side for 4.0 s, how far do you travel during this ig q(r:ihl o3ag.g) 4*rd4gmjpnattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 sa;:;t :/u a2yqu upuaa, your average velocity is:yuu;u2/ autaa q a:;p

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 63smeh 1ncwh2km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the1es36nc2 hm hw bear's average speed?

  A polar bear starts at the North Polgp,g5)ktnnl m n*m0p+pe: x7le. It travels 1.0 km south, then 1.0 km east, then 1.0 km5k +gxtp ),m* n: plgpnn0l7me 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 2c3xsqfn hq845hqukb ) jih3.school 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 fa qxnu 234jhc 8bsf.hi3q h5k)qr is your hometown from school?

  A motorist travels 18 ar:goh,bu, hyw9y+w60 km at 80 km/h and 160 km at 100 km/h. What is the average speed of the motorist for thioyubha,,8g9r: + wwy hs trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her :w/2dk-fkla+ gekk0e average speed for the tgk f2/d-: 0+kkeeaw klrip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/ qyx , -na,r,jn;ua+mrh north for 750 miles. Whatau,a mnyqrjn +x- ;,r, is the average speed for the trip?

  In a 400-m relay race the anchorman (the pers/ vm6/duyag*s on 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 cayu*mv/dg a /s6n 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 uniformlyy)i6 v+a v ple*laso qnm7/+i- and comes to a stop after 13 s. The car's average velocity during deceleration was 72 km/h. What was the car's decm*-v 7ily +saop+6/av lqine )eleration while slowing down?

  An airplane increases its speed from 100 m/s6td,4qg: zrd le har9 c qtcx*n6mo)pr+4l.6t to 160 m/s, at the average rate of . rlxrzt6p acd64t q4h)9n*dg tl+co:eqr,6m $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 kmpeqpj*4 h0r;e qle v:+:nm(sr/h accelerates 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 accelerates atptwg/ :f 3glothux 8bb7j-g4, $4.0 \; m/s^2$ 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 f cu.jl,p+yj6qjba7 x3or 10 s. It then speeds up with a constant acceleratiobju yj.3cxal pj,+q7 6n 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 of 5.5 npt,qp,yg 29r1(kexf *d8hws m/s experiences a constant acceleration of,es q*pnfxwhr8py2 kd,g91t( $3.8 \; m/s^2$. What is the cart's displacement during the first 4.9 s of its motion?

  A bullet moving horizontally to the right (+x directiony+ e.y25tzr+/ in9clcmrxq0 a kl+0*x/cvmn v ) with a speed of 262 m/s strikes a sandbag and penetrates a distact vy+r0 nql/9 mven2.m0/xrx5y *+ +i czlkcance of 18.32 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircra3sg z x* atbp,sis .5bot8q:,jft carrier. It reaches a , ti *sg58ob p3z.jsxq:s,ta bspeed 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 acceleration ozc7+a 0twl;mwf $2.0 \; m/s^2$ 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 e(* st*fvku7pto 80 m/s in a distance of 200 m. What is its average ac7tuf* s(kvep *celeration?

  An object starts from rest and undergotestsko5mne q2;u); -es uniform acceleration. During the first second it travels 5.1 m. How far will it travel d)tmst5 u kenqeso -;2;uring the third second?

  An object is moving in a straight line with constant acc6c, lpyj9puij7*qb9 neleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s.j*6unc yb qi7 ppl9j,9 How far does it move during this time?

  A car starts from rest and accel/yexd5523oq3 svlx waerates 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 decelehg8. yku3iw f6rate 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 tuvmd.cos2ye( 7rns green, a car that has been waiting at the intersection starts ahs m(dv2coy 7.eead 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 spb-f7nm0 vla*a eed of 12 m/s on the surface of planet X where the acceleratio *lab 7fmna-v0n due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upwardl5z x;3uvmo 0lesl1 vw3wh-,l with a speed of 12 m/s on the surface of planet X where the acceleration due tols1,53wev; w xu vm3-ozll hl0 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 surfacmn1t i1wvyv4: e of planet X where the w11ni t4vvym:acceleration 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/s on the surface of planin f5q/cc2v8 h78 f;otd,rjig et X where the accelerati hicon/idc f 85;,7vfqgt 82rjon 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 rulem.+s-bu3v05c gxd eja r between your fingers and releases it without.5xm3uj0ae+-bvdc gs warning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a t i htw)b d8w9ez924qvc )uu(wvelocity of 19.6 m/s. What is its velocity after 3.00 wub uv2 i t984ww(ehd))tz c9qs?

  A bullet shot straight up returnwc*fm2j6lxim , ds17hs to its starting point in 13 s. What is the inithf1,76xilm s2m cj*dwial speed of the bullet?

  A ball is thrown straight up wij1 k-mx2unm 8y c3:ybxth a speed of 36.0 m/s. How long does it take to return to its starting point?x3b8-ymk 1cjx:nuy m 2

  A ball is thrown downward from the top of a building with an initial speed of m-i8j3g olw+kr5pl8g 8 m/s. It strikes the ground after 6.5 s. How h 8jilpwlkgo8 g -+35mrigh is the building?

  A ball is thrown strd.l *al cnem y 302z:b*lzu m3nzxs66yaight up with a speed of 30 m/s. (only fill in numerical value in the bla36mus3*b nnlcal6ymy x2d0el. zz: z* nks)
(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 ofzt fq-d jg;)o0 45.9 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 3 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 vesg.pc6dd 1s .qe34a1csb 2hialocity at t = 1.0 s?

  In Fig. below, what is the velocity g;r+jbe 0gjo8f8:,)pq qo9tyx shs/gat t = 2.5 s?

  In Fig. below, what is the velocity at t = 4.0 s6+otz uhd 0yd cv+y7 bb8qzuo:4v2i0s ?

  In Fig. below, what is 5 wz (ekmk)i(bthe velocity at t = 5.5 s?

  In Fig. below, what is the average velocity from 0 to 4.02f -r;dh1pu gb:rgs 9ufzmi.0 s?

  In Fig. below, what is s-hu:lk /a*k9cqiw6*eab58yr el6j w the average velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration at 1.0 fqhhqd-8;+ vfs?

  In Fig. below, what is tj+g:k;+n / k7wavsgd jhe acceleration at 3.0 s?

  In Fig. below, what is the 6--y prqb7b opaverage acceleration from 0 to 5.0 s?

  In Fig. below, what is t4v,rf9wblgi 0 g+m. owhe average acceleration from 0 to 8.0 s?

  In Fig. below, what is t*kq+ia.215dilzy lz n5yfuv8he displacement from 0 to 8.0 s?

Does a car speedometer measure speed, velo: .g8l1ygr3 ok;rm rohcity? {speed|velocity}

  An object can have a varyi*bqvgz+(jh (6z+0qm, /qhumsm8ue dkng speed if its velocity is constant.

  The velocity of an object can b afte )n1 y;si67c osguh5kls099srn (e negative when its acceleration is positive.

  If one object has a greater speed than a second object:ycf x 0pc46ql, the first must have a greater a0c:y4 6 cfpxqlcceleration.

  Two cars emerge side by side from a tunnel. Car A is traveling with a speed of aw 1ye4yw8 41 o+ijyuj$60 \; km/h$ 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 iawoqtj)cd 4;i5( hu*rl18 k cubw2p8ets acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It l 0(dhixacv , 5czead fee1t.hcx48p/8eaves the bat with a speed ofec i8 a(zv/1htc.e d504p8haefx,x cd $120 \; km/h$. 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 acceleration, howz)aj9tc,g f,s does it change if air friction i afsg)j,ztc9, s ignored?

  As a freely falling object speed3o oz/,4d xe-.urtug-zdny3bs up, what is happening to its acceleration, how does it change if4 /ubox-un3dz,ogy-te. rd z3 air friction CAN NOT be ignored?

  An object that is tha ij z2s,zi /qv98h z8ahv0l7qrown vertically upward will return to its original position with the same speed as it had initially if air resistance is negligible. If air resistance is avaqvahizz,h z0 8j 27sli9 8q/ppreciable, how will this result be altered?

  An object can have zero velocityyk19 +akd2q wn and nonzero acceleration at the same time.

  An object can have nonzero velocity and zerwo/k,mop5z 4uo acceleration at the same time.

  An elevator moving from the second floor to the fifth floor making no stops al-dqufl183(g 7tyb 43pfhxmih.e/ og hong the way has zero acceleration all the time.3x4e3hh8do/q i7hgp-f(t gl .y 1bmfu

  A rolling ball moves x/n -3y0ukgm3.3ia8ya9u kbbs1eg c1 y+c thgfrom $x_1=3.2 \mathrm{~cm}$ to $x_2=-6.5 \mathrm{~cm}$ during the time from $t_1=2.6 \mathrm{~s}$ to $t_2=5.0 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.9 \mathrm{~s}$ is at $x_1=2.4 \mathrm{~cm}$ and at $t_2=4.2 \mathrm{~s}$ is at $x_2=8.1 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quapzysj8esms-+2 llq 54rter-mile ($1 \; mile = 1609 \; m$) track in a total time of 7.0 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from it thin2dtv ;lb:;p*,pw,hbo; w s trainer in a straight line, moving 104 m away in 13.0 s. Iw: dip2 ;tb;pnw*v; oth,b lh,t then turns abruptly and gallops halfway back in 4.5 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 fre v /6g koq0zeke;im+6-kp1gjom $12 \; m/s$ to $23 \; m/s$ in 4.3 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 fro a hv *lqh/zly y16q.q;1uz2qiqh*r pqo+h9a .m $15 \; m/s$ to rest in a distance of 59 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed ofyjxc 5edt4w/j) ht k4d((dj8i $25 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.6 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst ouk0ml4*key dptj9z/ 0v6x amzns0 +,vbt of the blocks to essentially top speed about, ka + 0n6tsj l0kd9vmzvpz0mb/eyx4* $11.3 \; m/s$ in the first 13.4 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 splz56k - 2cx /6rcxawiieed of $18 \; m/s$ to rest in 4.52 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 t( bqo,x:a .npzmjy+(ihe highway. Assuming m.op(nzaq +(x,bi jy:a deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truckdv7g),osp9 id 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 lessdy2m pn. h*4tr than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner m4p mry ndth.2*ust then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$