Suppose that an object travels from one point in space oguemng . t f*l4aiqu.+cgot 29c6 z, 4rv*a4rto another. Make a comparison betqv4a g t ag,eu*c2rg4uim.4 rt6nlf+o.cz*o9 ween the displacement and the distance traveled.

  When is the average velocity of an object equal to the instantaneous vel 7il8i 0np:w)mlwmg9pocity?

  A new car manufacturer adv;lof*,hd*90jh fk n kaertises that their car can go "from zero to sixty in 8 s". This is a dhf kdj na 9;f0hlok,**escription of

  An object moving in the +x axij *e0 6rdfb8oes experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x di *d.n bbpvbs69 )2unoouf7/ dwrection) begins to slow down as it approaches a traffic light. Make a statement concerning its accduv.dn76b2ou * / 9wfs pbo)nbeleration.

  Suppose that a car traveling to the West (-x direc 3qo,1uwvxd 28ny8wlwtion) begins to slow down as it appru n,1xw38l8v2 d wwqoyoaches a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make a statem e 3;.gvh0ernxent con xe.;hgev n03rcerning its acceleration.

  If the velocity of an objec/ vtjq u )shk::6s.nnwt is zero, does it mean that the acceleration is zero?w:tjnsv). ku:sq6/h n Support your answer with an example.

  Can an object's velocity change direction when its ac1r.cmqw+-e qzceleration is constant? Support your answer with aewm-qc. rqz1+ n example.

  Suppose that an object is4x ix,zq5ah3 p moving with constant acceleration. Make a statement concerning its motioqhxa3,px4 5izn with respect to time.

  Can an object have increasing speed while its acceleration is dec h8z wpr +;syg)pzg,2k.c-x kareasing? Support your answer with an example.a) p 2kzghy.rxsw;-+ kc,pg8z

  Suppose a can, after an initial kick, moves up along a smoocgdg61ne/)v yosm1( ksdh5 ru 8 bd*m8th hill of ice. Make a sty16 krmg8o1(sdsh85vu ec mg/ dd*)bnatement concerning its acceleration.

  Under what condition is average velocity equal to the average offw n)rva3oo bft +2/l2 the object's initial and final wr2t3)/+o fanvl ofb2 velocity?

  Objects A and B both start at rest. They both accelerate at u)/+hq-zxuf q4u )opgy a6 4qathe same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to that ofgyf4 u+pa-)ha6q uq4qux/z ) o object B?

  Objects A and B both start from rest. ws(w ;h8xdaks e;;3 iuThey both accelerate at the same rate. However, object A accelerates for twice the time(ks3 xad8u ;ewhswi; ; 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 ofv:7 y* 0avft;az3+x sp1neanh friction, which of the following is true concern nv3za ;p+*n ve:afx7h1y0sa ting its motion?

  When an object is released from rest and falls ienx8k- 5l b/ven the absence of friction, which of the following x kb-l 8/5evneis true concerning its motion?

  Suppose a ball is thrown straight up. Make a statemw2 qluu sf/(2ient about the velocity and the acceleration when the ball reaches the highest point /iu fuswq2l(2.

  Suppose a ball is thrown straight jx,9sbuia6v3 up. What is its acceleration just before it reaches its hi,xs u a6jb3iv9ghest point?

  Suppose a ball is thwc6p g6m6- k-,cdlq0qwa ur;q3 vezj .rown straight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and j lkp6,dm-wcu60w ;3eq6g rz-.acvqq acceleration as the ball is going up.

  A ball is thrown str /95kps k2v5fp ,uqnopaight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball ipk5/pqvkfso,92 pn5 us coming down.

  Suppose a ball is thrown downwje 8hejpvar/wr d).7 6ard in the absence of air resistance. Make a statemenehe )p6rr a8wjvd/7. jt concerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her acceler e8q:ds dos2e(nqwpvk, ne 8+qman5,/vgx3+kation when she s exeen(knsv2 dm/8 s+qk 3gpnvw: qq8,,o5a+ dhe reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. 1qzjpy5/c d 3 +8 goycr5r5:zbks.u duAn identical second ball is thrown upward with a speed 2v (twq5d/b3j8z:+ c51 gduy p5ozrs. yurck ice 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 go than the first ball?)

  Ball A is dropped from the top of a building. O+jy,anyt45 -ejxuy1 v-:hy gl ne second later, ball B is dropped from the same buil:+5 jt,h4xy yv-jgaul-1 n eyyding. As time progresses, the distance between them

  Ball A is dropped from.98*m yb,ht22noec3 w zwjlb c the top of a building. One second later, ball B is dropped from the same building. cn9wy2jw*m, hb o bze8lt.2c 3As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is thrown up, and.qoc.,o s iu,k1hb m9o the other is thrown down, both with the same initial speed. What are their speeds whooi .q9,c1mo uhkb,. sen they hit the street?

  A brick is dropped from the top of a buirwp;) k5l p nv r,n1t6ezr9.n fwcg(5ylding. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the two .) cnw;(n,tr5r n fzp9l 1ywkgrvp5e6 bricks.

  An object is moving with constant non-zero velocity in the +x ax4ei/vns d zy24is. The position ve2ye4v zsd4i/ nrsus time graph of this object is

  An object is moving with constant non-zero acceleration in the +x axis. The pos ).gg 2 x-b qitk5gv8lk+/jokoition versus8q k5+.kk g lix2g-tjgbov) /o time graph of this object is

  An object is moving with constant non-zero velocity in46fl uy*jwi7 l the +x axis. The velocity vers *7jwuif6lly 4us time graph of this object is

  An object is moving with constant non-zero acceleration in the +x axis. The:f0n: v-ai3a2k4o he5m yml2zff;o az velocity versus time - f;a vfonl5afam:eo4:232k yzhimz0 graph of this object is

  The slope of a position versus time o4 xa5( gu gv:xg6mcm47mhen wc.g7d *graph gives

  The slope of a velocity versus time graph gz hurp6y 9;nc;ives

  The area under a curve in an acc./sf6cvp t1 bnnuk6 q*eleration versus time graph gives

  The area under a curve in a velocity versus time graph givesqb l 3g j;oav*e:9;dmd

  If the position versus time grail3gd9(hn.r66bmbri. xd 7ye yil 38rph of an object is a horizontal line, the object is 3d9ide7.m g(6yili bbryrr8h3n. xl 6

  If the position versus time graph of an object is a vertic6 iij-rfk;. 8kwaams,al line, the object iswi f.a ija,6k-k rs8m;

  If the velocity versus time graph of an objectm jg 2 ,w.*t9-iytqs lk:yyz 84hefvv9 is a horizontal line, the object ht,z2ve*l 9 j :yim8s 9yg.-fwv qk4tyis

  If the velocity versus time graph of an object is a straight li rjlrr,e37)m se8r. y*czh1d- wv6o jine making an angle of 30 degrees j71jrh r*36moic8yre,.zr)ws de- v l with the time axis, the object is

  An object moves 15.0 m north andogz( bslqcz.:b3 ou ;x/n,vi 4 then 11.0 m south. Find both the distance traveled and the magnitude : sq vc4b,3blzuo.i(gnz;/xo of the displacement vector.

  A boat can move at 30 km/h in sti i oz0/;ecl+eill water. How long will it take to move 12 km upstream in a river flowing 6.0 o;e lz0 ic+i/ekm/h?

  55 mi/h is how many m/s? (p ,bxhbwv/(v 21 mi = 1609 m)

  What must be your average speed inq q,wpfp *-he7f g1g.n order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 h 1m(+m+tg brvgours and 57 min. What is the average speed of the b+rmm+1(gtg v runner in m/s?

  A car travels 90 km/h. How l1w o azv40,efg l0xzy7ong does it take for it to travel 400 km?

  A ly (light year) is the distance that l /b)e4q bdhiyr. ,+pvnight travels in one year. The speed of light ip+/i,r bhvne 4bqd .)ys $3.00 \times 10^8 \; m/s$. 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 loms dw4ls p3zxs)z/-(nufr u)( ok to the side for 4.0 s, how far do you travel during n s/ zd)uwz3fmx-rl)4(s (supthis inattentive period?

  If you run a complete loop around an outdoor track (4003 ka:f7omo f5xsn1k/g ;9rkjb m), in 100 s, your average veloc9o:/fk kg3bm k57f1x s;jr anoity is

  A polar bear starts at the North Poler r1le39 kptknh+u/ab()v :vk. 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 trip takes 45 min. What was the bear's average ku (l3)b1vv/ta+kek9r :nhrpspeed?

  A polar bear starts wx+5s u4oo 1kwx 1:gdxat the 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 trip takes 45 min. What was the bear's average velocity?x1s 4:u5wwkxo+xdgo 1

  You are driving home on a weekend from school at 55 mi/h for 110 mi s26jrge) hzd5les. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your homhde2rjg z)6s 5etown from school?

  A motorist travels 160 w58o vn w qsa;,)3(olir(grn0om bu,pkm at 80 km/h and 160 km at 100 km/h. What is the average speed of the motoriua nn sg3ww,(lv5bo8;r pi )(oqo0,mrst for this trip?

  A motorist travels for 3.0 z5e+s*csw v+hv r .o0bh at 80 km/h and 2.0 h at 100 km/h. What is her average speed for thh+or+ b*vsz.s0c v5ewe trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 2 z40 ag/rsbnkn9yq6.f50 mi/h north for 750 miles. Wh b 6ykgnfr4szqan.9 0/at is the average speed for the trip?

  In a 400-m relay race the anchorman (theh2 enkg* l j13jb-.7k ervid7o 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 the final leg of the race, in order that the tg7j* jk7e h v k123nb-ei.rodleam A runner not lose the race?

  A car decelerates unifoeh , yc4 (e etq+z4ok0isv*8yzrmly and comes to a stop after 9 s. The car's average velocity during deceleration was 67 km/h. What was the car's decelerati + e *h04t4e iq,oevy(8kzczyson while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, zg h)gjw,. e8ych qc:x-;1 s5yqru)ynat the average rate of c q8h;) jug-1yxe.c )zq,5ws:nyyr gh $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the ra2)f vu 4.j yuuwyj-ir*te 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 accv8pg8 iqvo5s 3elerates 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 wbmtxlw4i8 9l f(-c601to: fz me8zks up with a constant acceleratio l-kt8 9bzwsi0(mf1ex6 tfwm: lc4o8zn 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 4.1 m/s experiencer)mp)x7 - ypmds a constant acceleration ofpx- 7ydrpm)m) $4.5 \; m/s^2$. What is the cart's displacement during the first 6.9 s of its motion?

  A bullet moving horizontalp5llzm 05n; k;e uiiuk)v;+q pugm/9 gly to the right (+x direction) with a speed of 499 m/s strikes a sandbag and penetrates a distance of 66.91 cm. What is the averagem;9uk/;g5kep lzmil;5i) guqn pu0+ v acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraflv7mn 1j4wn+3 nhfnv fm)*cd1t carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acce1 mn n3w1vd 7n+c mvl*j4)nhffleration is constant, what is the length of the catapult?

  A car starting from rest moves with constant acce):rllci bxt d,0de g7.+wtgm(leration 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 inssjubdhrv(hj, ( ,q.7 a distance of 200 m. What is its average accb,s( hvu7shj,qr.( djeleration?

  An object starts from res lm/xtu: bw.rcq 6d-0sx vwk28t and undergoes uniform acceleration. During the first second it travels 9.7 m. mt2x br q. lwku8x/svd-c:60w How far will it travel during the third second?

  An object is moving in a straight lin6 iyhc ;ntnk)5vrd,mle(t s;/e with constant acceleration. Initially it is ttsnhmr ); ,;cvynl(6t5ke id/raveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates hj dil,0uy kjaful w9w (r-757uniformly 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 abowrvb:4q-b- g ui w) o-xk2fen3-ft3 exut $5.0 \; m/s^2$ 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 bn 0h2dju 6g,rvu(t oocq,ji8 t)y)jj5een waiting at the intersection starts ahead with a constant acceleratiguj 5ujotyhiv(q 0t 6 nc))8rdj,oj2,on 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 on the surface o*jovamra5ji y-c/ 1e,f planet X where the acceleration due to gravity c,m-*ri1 5jjveao ya/ 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:lyv3 g( xt:sg/s on the surface of planet X where the acceleration duglgv x3t:ys:(e 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 planet X why/9 pw.kal9aqere the acceleration du9lw9akya . qp/e 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 o:rd7u 3tzt+ r stz:;hjn the surface of planet X where the acceleration due to grat3:tus jz ;+ td7zhrr:vity 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 houhcn:g;s i8(t kehj/,lds a ruler between y c8/u:egs,ihh;t( knjour 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 velo+z r(bx jf(/csj zvy.3city of 19.6 m/s. What is its velocity after 3r+vzj c/.xzsf(3 jb y(.00 s?

  A bullet shot straight up returns to its starting point in 9 s. s8ca 8bdbeg4h )*9husiril2 ) What is the initialagb4ers d9csu b)i)h2l 8h8 i* speed of the bullet?

  A ball is thrown straight up with a spee17eyf e ipsjj(5z(pb7 d of 36.0 m/s. How long does it take to return to its stb(eijps5e( 77fj 1y zparting point?

  A ball is thrown downward from the top of a building with an ini7:1,9d/k: drvkpd(y yf qljm ztial speed of 28 m/s. It strikes the ground after 3.2 s. How high 9dpj:klq7/1dzdv:r,y y(m fk is the building?

  A ball is thrown straight up with a speed of 30 m/s. (on ,qcw iio/ -rwilh-g6:ly fill in numerical value in the bla-/wli :i -i,w ohgq6rcnks)
(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 igkc y cz (szha2f/86q47rvj( speed of 42.7 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 1 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 the velocity at t = 1.0 s?ubq;lh*ri 4h0 ,uiar6

  In Fig. below, what is the velocity at t = 2.x1l(w: di 2 o2krzfc0j/gu( vi5 s?

  In Fig. below, what is the velocity at t = 4. x,x((0bywjrk42 crf j0 s?

  In Fig. below, what is the gke a-7g/jt: gvelocity at t = 5.5 s?

  In Fig. below, what is the b5 yiy12l u;s7/3jo2cfyc loc average velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity frofze8n7zsy1hh(2 bwg (9ob pt8m 0 to 6.0 s?

  In Fig. below, what is thcnchy/zs em 3y;(,t59 huyw y9e acceleration at 1.0 s?

  In Fig. below, what is ty rlj7) 8fiss1he acceleration at 3.0 s?

  In Fig. below, what is the average acceleration from 0 to 5.0 s?m+neo0 za3us9y6bay.-7eyle

  In Fig. below, what is the average acceleration from 0x.y -m a4v7ekpnah:j : to 8.0 s?

  In Fig. below, what is the displacekl1ix7:-0r tqbmuh a-fzy:)dment from 0 to 8.0 s?

Does a car speedometer measure speed,;/kz 0a9crzoa velocity? {speed|velocity}

  An object can have a varying speed if its:k -e-99 5fp;x vdre14 ymuxhzfq-sfi velocity is constant.

  The velocity of an object can be negative when its acceleration is 8mpofi/u 41*9k lvgr6s q)bis positive.

  If one object has a greater speed than a second object, the first mb.g v ) lpm3mnjqkt-./ust have a greater .pm3vk/ .gqb)nt jlm-acceleration.

  Two cars emerge side by side from a 625cr.yk*gz+dm 7jei ecsq ,v 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 incrb.hbkh3gzq+ue) msb79 7 bqj)easing in speed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It leaves the b6/fn07maep1lwcjaxmp t 0t8mqg /-b;at with a speed ofbc -we1pjf qg80mp7 6mt0a;tmx// lna $120 \; km/h$. 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 obj 12nhr;d.txq1k;alet c ssll;(z v8m3 ect speeds up, what is happening to its acceleration, how does it change if air friction is ignoredql n83 rxl;11a(2d;se ctvl.k;zts mh?

  As a freely falling object speeds up, what is happening tor 3u*qlpf4j.0 lsox6kw2j, sn its acceleration, how dxok20us wrs l,n.q jl46fp *3joes it change if air friction CAN NOT be ignored?

  An object that is throwe 4*d6r ktv;: j+tihugn 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 appreciable, how will+r*h 4dgitk tv:uj; 6e this result be altered?

  An object can have zero velocity and nonzero acceleratiz b50 sgx7xj exq;;tinz mm,02on at the same time.

  An object can have nonzero velocity ank bnpmgvbhlj):byh5k :u(r2 oa.9 r9:d zero acceleration at the same time.

  An elevator moving from the second floor to the fifth floor making no st swt.ov gkw8usl7tmd :z*ok75 /5 ybjwt6,)ooops along the way has zed7,twy s oko:kbg.tjl5 o wz) umt57wso6*8 /vro acceleration all the time.

  A rolling ball moves fro+ 7a;a1ejvm mpm $x_1=3.0 \mathrm{~cm}$ to $x_2=-6.1 \mathrm{~cm}$ during the time from $t_1=1.9 \mathrm{~s}$ 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 $t_1=-2.9 \mathrm{~s}$ is at $x_1=2.6 \mathrm{~cm}$ and at $t_2=3.5 \mathrm{~s}$ is at $x_2=8.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight cd;f6,07uusg v0hyd hn omplete laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 6.9 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its trainer i.;qaxv nl3dh g 7z:f3an a straight line, moving 104 m away in 11.0 s. It then turns abruptly and gallops halfway back in 4.8 s. Calculatg.v;3 d hnlq:z37a xfae (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 froex wgc0wd4 iv15;it8dln70j f m $10 \; m/s$ to $23 \; m/s$ in 5.9 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 /*7 x;v5vprf v;lbhxv $18 \; m/s$ to rest in a distance of 73 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed kpd0p2 ry6 ki0mvwv+3 of $26 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.2 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the;gtc)+*x: o wh-i ns id6o,gte blocks to essentially top speed about in -+i*6;c:wxg eo),dgtost h $11.0 \; m/s$ in the first 14.1 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 fr)qk62;tw1-lk g;h o 6ysy(gdqbj m(gvom a speed of $21 \; m/s$ to rest in 4.55 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car lekmu: uxu7i i x0in3,c kh.1b1daves skid marks 92 m long on the highway. Assuming a deceleration ouxm0 iii1 ukh71nk b.cud3:,xf $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truc dv6sqa(tf5j 7k 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).    $m$