Suppose that an object travels from one point in space to another.y6v b0ha b4kx- Make a comparison between the displacement and the distanc-46ayv 0kbbhx e traveled.

  When is the average velocity of an object equal to the instantaneous velocity:0ofs(w iqs2**g jr91vjztql ?

  A new car manufacturer advertises that theixl)xw( qv:mz iyjpr+ ;8/po/ar car can go "from zero to sixty in 8 s". T qxiwmzp(rl y/v8 ;p+xj/a )o:his is a description of

  An object moving in the 2bkp9wstui.y. heg*( +x axis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the Eap: lc6pxyh c4(xx7ei 4st (+x direction) begins to slow down as it approaches a traffic light. Make a statement co :h7(c6l 4yxx4xpcepincerning its acceleration.

  Suppose that a car traveling to ql2d3.d.ruk43 gt4dc t7weg i the West (-x direction) begins to slow down as it approaches a traffic light. 3c .dtr74g3d qikd2welu g.4tMake a statement concerning its acceleration.

  Suppose that an object is moving wi48dmrg wegho6)7 ju5ith a constant velocity. Make a statement concerning its acceleratio5r4ju6)wo h gd8mie7gn.

  If the velocity of an object is zero, does it mean that the accele0v6xg qwo ot.t8 17oxtration is zero? Support your answer with an examplo60qo8g7otx tvw .xt 1e.

  Can an object's velocity chv u* li;mn moild:5m 5pd;lbb(36npp5ange direction when its acceleration is constant? Support your answer with an example.l;li*n6m5b mp umnl b;p5 (i d:5dp3ov

  Suppose that an object wm rfeah 6)s9:is moving with constant acceleration. Make a statement concerning its motion with rew)fh9r:a6 m sespect to time.

  Can an object have increabsre. my.q a f;sid86z 9-ap7esing speed while its acceleration is decreasing? Support your answer wit yir6;qpe.ab s fe.amd97 -8zsh an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice. bcc w kb,3h:tf /xgud:ob*1;b Make a statement cog;*whdt:, b:bkcxf o/u3c bb1 ncerning its acceleration.

  Under what condition is average ehl( vxv 7zf.-velocity equal to the average of the object's initial and -7l vv ze.(fhxfinal velocity?

  Objects A and B both start at 9:sw,w,z v1qad m,wno-h2jnxrest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the finalhnd:, j-vo ,,xnw mw12wsqza9 speed of object A compared to that of object B?

  Objects A and B both start from rest. They both accelerate at the same ra dxw6rvvu+oc 6 wf n v)3yrr941*x6uyete. However, object A accelerates for twice the time asu*x6nvd) 1 9y 46errwov+6 rw cf3yvxu 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 anxo c+4bk*iu07ljx b-wp) s8 zbsence of friction, which of th+ uxwzix8b4pso*-nkc07 l)j be following is true concerning its motion?

  When an object is released from rest and falls in the absence of friction6 r3lq.q0gp ev, which of the following is true concerning3q r.lve6pgq 0 its motion?

  Suppose a ball is thrown straight up. Make a statemehx3qz 4haj1, + muk3txnt about the velocity and the acceleration when the ball reach,mjh3zu+4 xkx ta31hq es the highest point.

  Suppose a ball is thrown straight up. Whxvkcm6.wt,7zk v 2g m2at is its acceleration just before it reaches its highest po,.2z6c7g2 kvtxmwvm kint?

  Suppose a ball is thrown straight up, reaches a maxim.k,thnosuz8q(yf .h . um height, then falls to its initial height. Make a sh.syz8qkh(, ut.fon.tatement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown str 1yz1 v nhaa 8vpyf+zn1.k5.dbaight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and accelerationvn yyn.f8+h z1kz11da.vab p5 as the ball is coming down.

  Suppose a ball is thrown downward ptg c,+1p wpazplo6o8*7fev3et /8m oin the absence of air resistance. Make a statement concerning its accot1e pz8 vg/lp* o67ftpp3mc eaw,o+ 8eleration.

  Suppose a skydiver jumpn/d zbkth,9k 7s from a high-flying plane. What is her acceleration whe/nkzdkb7 th, 9n she she reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. Anmx*-i 6 dmtvt6sdu)3s identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of thst6du6x - v*mt )dim3se 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 l tg2ljx9*7 b(3udz hp/b2pqn top of a building. One second later, ball B is dropped from the sgq 23 nbp92 pxhl7dlb(*j/ ztuame building. As time progresses, the distance between them

  Ball A is dropped from th y9)f-w5qgcc2z s yve4e top of a building. One second later, ball B is dropped from the same building. As time progresses, the difc)s2y5y c-f 9gzqw v4eference in their speeds

  Two objects are thrown from the top of a tall building 6gtv+r)gy4c n. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit the strtyv)cg4 6 nr+geet?

  A brick is dropped from the top of a building. A sehe5c0cjz j f-/cond brick is thrown straight dowcjj/f0-ezc5 hn from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving witw.kfa,ivvn9 - m1:eech constant non-zero velocity in the +x axis. The position versus time graph1 v. na9emiwkf e,:cv- of this object is

  An object is moving with constant non-zero acceleration in the +xr.)2 z 00gs ugzybye tyk:c;g5*um 5be axis. The position v z5 gycy.5tz2kgy; beu 0se) :mug0b*rersus time graph of this object is

  An object is moving with constant non-zero velocit0/xh0quq, (lxv2 z)l.javi jw y in the +x axis. The velocity versus time graph o ,w0v0lh(x)jx. /q2aqju lvizf this object is

  An object is moving with constanm3wj 6kgg(*gz 0w+cf nex 7kx4t non-zero acceleration in the +x axis. The velocity versus time graph of this objeck0gnz( x6gf mew+k *3wxcj4g 7t is

  The slope of a position versus time graph gy n(lulzuy ich12m/ 4yf:gw2ps.f 6o)ives

  The slope of a velocity versus time grbh5 pr(iwaih38 - zbg9aph gives

  The area under a curve in an acceleratio:oq7n3s fq- bdfn 9;ocn versus time graph gives

  The area under a curve is yb2p my/ii0m07 hdb9,vwr+qkb1q m 3n a velocity versus time graph gives

  If the position versus time graph of an object is a horizontal line, thf v+5.kul(z(k frb (ire object kiub(.(+ff( zv 5rlr kis

  If the position versus time graph of an object is a vertical line, theh mi pwdxg28.qk)v334 udlox7eb ;n)o object isn8olq4 73u2 3)h.)omvkp gwbxxdi;de

  If the velocity versus time graph ox: jxpo 0ggwp0d z0s63f an object is a horizontal line, the object sg06pw00xjxd z3go:pis

  If the velocity versus t+ (1lzd lf zuih5 ytskoj0i6/,ime graph of an object is a straight line making an angle of 30 d/o d+tlhizjy sf6k 0zl,(51iu egrees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the distance trp2x mhm/b8u , n(u.vdbaveledudm/(xv8bpun2., hm b and the magnitude of the displacement vector.

  A boat can move at 30 km/h s vq.4. ibm0s8 ebmaxx5.pv7zin still water. How long will it take to move 12 km upstream 4qmx 58ass.b.0vmp7 v .x beziin a river flowing 6.0 km/h?

  55 mi/h is how many mcjbky4x2y2 5d /s? (1 mi = 1609 m)

  What must be your average speed in owz(j 9f0(u: :gwu6agg olyb18+petbe rder to travel 350 km in 5.15 h?

  A runner ran the marhne u1i o5/d(yathon (approximately 42.0 km) in 2 hours and 57 min. What is hni51 od/ (yeuthe average speed of the runner in m/s?

  A car travels 90 km/h. How long does it tabi4p8la q;f ) *xguc9ga 4or5mke for it to travel 400 km?

  A ly (light year) is the distci7p(x u:24ibqxhk9z-f c jv5ance that light travels in one year. The speed of liuxbc x f :j5cik7vi-h2q(z49pght 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 t.fje9nz x+lvks;ebl tp 8775r.6k c7ero.t h km/h along a straight road and you look to the side for 4.0 s, how far do you travel during thisvh..t +;tcexolkpbsrr9eef5 z nk7l j7.t 68 7 inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100m6y t2a(c hp9k s, your average v 6ptk9 mh2cay(elocity is

  A polar bear starts at the North Pole. It travw*vgl ns0s2z+.a5zt pels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting pn 2 tz+azswlp5.s v0*goint. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It travels 1.0 km south,q d:k:.qfy7 )k9/e qzoxnn )vv 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. 7 n :nvke/o9vkqdq.)y:q z)fxWhat was the bear's average velocity?

  You are driving home on a weekend froviqk ad7 8lr( t9sp4*fm school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. r48i qp7*9kd(ats fvl 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 th u:oqu8z +9 *.awt zz0urcz2,fzb;fcpe average speed of the motorist for z0 z2put. fwzzf8o,zc +*:q u;rb ac9uthis trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. Whadmlh/b 8 550o.l:m5nnwkvmtwt is her average speed for the t 5nm/llb . om85vwt: wmdk5h0nrip?

  An airplane travels atjn( zu95nkxi :pau*5a 300 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. What is :za*u x9pnnu ( 5aik5jthe average speed for the trip?

  In a 400-m relay racm 2f blu:j:w z:/.k+db;r ju akcv7ph4e 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 tea+: kvur2jfw 4up b /.z::;kb7mjldcahm A runner starts the final leg of the race, in order that the team A runner not lose the race?

  A car decelerates uniformly an.h*g5f(pfc shu:zz g; d comes to a stop after 13 s. The car's average velocity during deceleration was 69 km/h. What wazgf h* :.5;( uszfgcphs the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s tty*tza:74;6mx h3 wac 2*e,qioa*r /o c fqnpmo 160 m/s, at the average rate of 4r:oo*cwt ;,xphe atiam/ 3* 6qq f2 m*7azcyn$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rate of s mz u64 x/.imtlu1zw+$2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from rest and m )4v+ xrzyfp2ig th+ui/5f yk9pyp8; accelerates 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. Iw(3c+sb zi 0 ev7p1odot then speeds up with a constant accelerationd+ico o7be (1wsvp0z3 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 1(g6qb 6x24ktrz22 e5 zmexsgm.9 m/s experiences a constant acceleration o 26 eegx6t24(xz mszkmbr q25gf $3.3 \; m/s^2$. What is the cart's displacement during the first 4.9 s of its motion?

  A bullet moving horizontally to the rightn+ jxe yglbr(cx 2fq4e)):p7a (+x direction) with a speed of 303 m/s strikes a sandbex 7l )gyeaxb) 4q: (2pjf+crnag and penetrates a distance of 94.48 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapujg// yo fugf pt*8t5v2lt on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuminf5/v *2 gfu8pogyt/tj g the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with constant wqhz3mocw 6v5t5c: .tn 3zfon,* km/h 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 200ye i-ny3t) )jj m. What is its average accele3y )yi jn)-tejration?

  An object starts from rest and undergoes uniform acceleration. During the fiet 8ayto-zhs: r/ ,ue1rst second it traveloety:z uat 1,seh8r/-s 1.5 m. How far will it travel during the third second?

  An object is moving in a straight line with constant acceleratio5o883um nwux1g(d vnyn. Initially it is traveling at 16 m/s. (n dxu3n8vwm5u 8go1 yThree seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates ux;9p07 vtrqa9lj dos- niformly 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 bxs2 +g phdy/1bs , * pp5;lkw6 ykf42r0ehlolabout $5.0 \; m/s^2$ 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, ,q iupzbb618qa car that has been waiting at the intersecti,zqq86bui 1bpon 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 speed of 12 m/s on the surface of plw7( ,wu8ola;g zs pe 2 l(mmko-rlc;z7anet X where the acceleration due ts zm; c (wpu-wl(kerg2m8la, 7oo7l z;o 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 X wh8dr +5y.c ybj(+lp+ xtnzye,qere the acceleration due to gravit+jy+xt.,q yypcb5 rn8(e z d+ly 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 3jas:pc :w7famdqz i-: n/ c1xspeed of 15 m/s on the surface of planet X where the acceleration dm- dc i n13c:fwa7s qp/j:z:xaue 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 afy d4(r7hgad4 4uh)qa speed of 14 m/s on the surface of planet X where the acceleration du h)q u d4y44fdaha(7rge to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usuall2rddp+xw/f0lk( 5myk y greater than 0.10 s. If your friend holds a ruler between your finge xrk(d0kmd y+5pwlf/ 2rs and releases it without warning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upw/-7/axvh(m s jvlzl o-ard at a velocity of 19.6 m/s. What is its velocity after 3.00 (/-xamol-/7hz ljvsv s?

  A bullet shot straight up returns to its starting point in 8 s. snq .tq3q* p(cWhat is the initial speed of tqt c3qp.(n qs*he bullet?

  A ball is thrown straight up wit2ja;0ird ylue f/99)u fiwo 28nnb j;th a speed of 36.0 m/s. How long does it take to return to its star90en8fywt b;/)9u lujf d; 2i 2ionarjting point?

  A ball is thrown downward from the top of a building wvjk(4l (n2kd f,ls 2ygith an initial speed of 19 m/s. Ity(sln ,4 kfk(d2lgvj 2 strikes the ground after 3.7 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. yuuj0gat( g0,ur )z/tka4hm 0(only fill in numerical value in the blanks)g0 u()4/00krygjazaum hu tt,
(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 thewvug :)l ,w-pz pwgsen /zdsxc3d688, air with a speed of 26.0 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 = 1,g )bk nx;x p.ejs*cv2.0 s?

  In Fig. below, what is the velocity at t =n,(z ,gm6rrltgoo9di 1 8k7xws0l( pl 2.5 s?

  In Fig. below, what is the velocity at xwbm-4f1ki x5 t = 4.0 s?

  In Fig. below, what is thev0vkl3bv*0n mae nq(d q,+)ht velocity at t = 5.5 s?

  In Fig. below, what is the av.bqig yj*ewr54aokx 0j 5p8- qo8e z4derage velocity from 0 to 4.0 s?

  In Fig. below, what iwluj 19 )nx-fm s7yfosf 8 3nck2wyxb 95m2/pzs the average velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleratl (frevr xid67ov *,xghr0 r06ion at 1.0 s?

  In Fig. below, what is the acceleration at 3. is/6evzg;1 8wqqi ;e/+/un ye;iwfjk0 s?

  In Fig. below, what is the average accely vt;3bbq*+ouv dj);i eration from 0 to 5.0 s?

  In Fig. below, what is the w66mj.u q k/bdaverage acceleration from 0 to 8.0 s?

  In Fig. below, what is the dwl s lj/(zz.l8: fvgf6isplacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {spe,haff7 afg t s1 qwnv:x)5yr7r b5a*y0ed|velocity}

  An object can have a varying speed if itf3q 4s1w1*gx znj1(4ispic zln 6spo4s velocity is constant.

  The velocity of an old vbyt-i::k0 nfv m0+bject can be negative when its acceleration is positive.

  If one object has a greater speed than a second object2wien5ebx h)ea;v()e , the first must have a greate )n(;x 52eiheabeve)wr acceleration.

  Two cars emerge side by side from a tunnel.-8*fv g z :.w.ficobf3ln;hw c 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 increasing in speed as its acceleratio/. u r0aqsvf;hrui:i0 p y*g6y*.wcwvn decreases.

  A baseball player hitfa )f *aa-f;of-x8wcmqd :.p cs a foul ball straight up into the air. It leaves the bat with ada. c8;*f-faa:cmffpxq w o)- 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 qyw+ kw )mfg59happening to its acceleration, how does it change if air friction is ignoy+w) qk9 fgwm5red?

  As a freely falling object speeds up, what is happea):e/daj2v)m5kbpk g.7syqa a4lb,qning to its acceleration, how does it change if air friction CAN p /lb dakaevmq,jba2a7.))syg54 q :kNOT be ignored?

  An object that is thrown vertically upward will rn +/6 mezq5urb b.hwb5eturn to its original position with the same speed as it had initially if air resistance is negligible. If air resistance iubhewn6 .b5z5mq/ br +s appreciable, how will this result be altered?

  An object can have zero velocity and nonzero rk ep m/z4y+2bacceleration at the same time.

  An object can have nonzero velocity and zero acceleration u6 6rx vml4by1l-am f7at the same time.

  An elevator moving from the second flz +w+*2:oo hj/h caddtzd aq7*dy7:m moor to the fifth floor making no stops along the way has ze:/oazd*qod* 7+m hd:yz mt acw72hj d+ro acceleration all the time.

  A rolling ball moves f3k0zi* 0lidfjrom $x_1=1.8 \mathrm{~cm}$ to $x_2=-8.3 \mathrm{~cm}$ during the time from $t_1=1.9 \mathrm{~s}$ to $t_2=5.2 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.0 \mathrm{~s}$ is at $x_1=2.1 \mathrm{~cm}$ and at $t_2=3.1 \mathrm{~s}$ is at $x_2=7.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around aft5m-; y(ybozr 0rze- quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 7.9 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its trainer in a straight liggv jp. u6.x;fne, moving 97 m away in 9.2 s. It then turns a xg.;j.6fug pvbruptly and gallops halfway back in 4.6 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 from ;q0zphrhn (9h 4m 10sja+wzce $12 \; m/s$ to $22 \; m/s$ in 4.4 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 a:5g+eurxem ho5+mjt7 v(c8o kdv ,c8 $22 \; m/s$ to rest in a distance of 85 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reaf)8kozfk9q+blc6isn :jh1 m3ch a speed of $27 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $3.0 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentosj7fjix(oy *7 e8199xrn r pqially top speed about(jq7 y *rxx1s p7n8jori 9e9of $11.3 \; m/s$ in the first 13.1 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 ofoh /sv tcm 2akl.2:x6v $19 \; m/s$ to rest in 4.26 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 s 7b,lbf-vexqzoxu m1 b3 9;g0-ne2 xb6jb4 yethe highway. Assuming ab,x n o - ;e9-xqx607bzsmulv4bfy2bj e13geb deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goin;vimcf.y.wd oas c,4z5n5(q3o-qy z eg $25 \; m/s$ 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).    $m$