Suppose that an object travels from one poi25 xnptur f)t7*a7mhhnt in space to another. Make a comparison between the displ2r 7m hp7x*)a5hutntfacement and the distance traveled.

  When is the average veloci3fpw3 gknt - ;.v;znytty of an object equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to ao b40lomfqd-6 y tdv *us:m(9sixty in 8 s". This is a dedf9l *m(q- mv u0bao:t6sd4yo scription of

  An object moving in wkq7(o7 )yo9g 1nzgyothe +x axis experiences 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 slow dcvao(1z g ahv0*n w*j+own as it approaches a traffic light. Make a statemena+ o cgva*(wzn0h vj1*t concerning its acceleration.

  Suppose that a car traveling to the We2n a;fhk+qov3ddi. v *st (-x direction) begins to slow down as it a2vfa+. d *kq3diovnh;pproaches a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make a statem(dh 8s w08wfq8n9gr oment concerning its acceleratignr 0of8(whmq 98 ds8won.

  If the velocity of an object is aalt yr;. +amvw-:d4 izero, does it mean that the acceleration is zero? Support your answer id-+a a:;.ramlvw4y t with an example.

  Can an object's velocity change direction when its acck6zmx ewzi) jdqx975, eleration is constant? Support your anskz9 ,z7 qmdeixjwx56) wer with an example.

  Suppose that an object is moving with constant accelerati0(dl h w+9v4;fzs hobcon. Make a statement concerning its motion with respec+0 (dclb9ozh wh sf4;vt to time.

  Can an object have increasing speed while its acceleration is de3.8 5bjk,4nyli k 0lyjuoqs w.q3 (jvpcreasing? Support your answer with an exam kbi3,jl5qon8j4up.. yqlv0jw(sy k 3 ple.

  Suppose a can, after an initial kick, moves up along a smooth hill op .jrqg z+mra. 2oc7j/f ice. Make a statement concerning ia/r2.qc +gj rmp j7o.zts acceleration.

  Under what condition is average velocity equal t/ ,ftgp x.4*sm:l sytjo the average of the object's insg4ftp .,/j tx:ys ml*itial and final velocity?

  Objects A and B both start at rest. They both accelerate at thej c:xj o63w 3ynks0,dl same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compar y3j,c6x :sjdkl3 ow0ned to that of object B?

  Objects A and B both start from rest. They both accepera/ glgx/ uu3tx5 zn. ,-8cz, u/nhxlerate at the 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 object5r/ uc -zxp, x/./ng geahz8nxt,uu l3 B?

  When an object is released from rest and falls in the absence : )e2spx 7g8*i.+7raipeew/euwwcun of friction, which of the fo g27i7euecnr uwpw 8)./si pxea+*e:wllowing is true concerning its motion?

  When an object is released from rest and falls in the absence of friction, whic6 ljadq q45i-d1crd3 jh of the following is true concerning its mo lj31dqr dja-5d6iq4ction?

  Suppose a ball is thrv/n-3)mx hw)u9 ubn vlown straight up. Make a statement about the velocity and the acceleration when the ball reaches th)u)3 -n vnmv/hxbw u9le highest point.

  Suppose a ball is thrown straight up. Wha ra.efeb.tqvv c( n-ve)6b;31gds od .t is its acceleration just before it reach3nsb)vedq ;b g1vvrc6oea.-ed.. t f(es its highest point?

  Suppose a ball is thut4e px7om u3+rown straight up, reaches a maximum height, then falls to its initial height. +tu4m o3p7xu eMake 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 fab4sp 7;v3ve)mv1cd mw lls to its initial height. Make a statement about the direction of the velocity )bp e47vsmm v ;dv1c3wand acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the t:t qqyco4kn2 40du.6of7nam absence of air resistance. Make a statement concerning its accelerati2ok7u 4q ttoaf4 n:dn6 ym0c.qon.

  Suppose a skydiver jumps from a high-flying plane. What is her acceleration whel9kpp :c3yj3; w tnrlp/su) l*n she ss3jt)pp / *lpuw;ky9l:rlc 3nhe reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical second bmq 2*b0nd ; a2hu hbx9-.nnujlzi 09lpall is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the second bbm nh20*nu.lizb 0ld9 jxqan-u92;ph all 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.ah.5u gqi6z42mk qve-d; tgt top of a building. One second later, ball B is dropped from the same buildingtqk6-.udg eqzi ;.a52v gth4m. As time progresses, the distance between them

  Ball A is dropped from thersbg( tph 0o:)5 2 ivj9)gjuek top of a building. One second later, ball B is dropped frovhk(g5 0)jgr)2pij :tus eb 9om the same building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall bu0.bwi n tqs vz-.v;9pqilding. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit the stre9.n; .q bvpistw -zq0vet?

  A brick is dropped friev6nub 6n59q.kj v 7iom the top of a building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare t i v.7n5 n9kie66qbujvhe accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the y n*i6cv)uqt :+x axis. The position versyt:*viuq)c6n us time graph of this object is

  An object is moving witqa(3 z5,6lwep pw9ih2gd uj1zul77fvh constant non-zero acceleration in the +x axis. The position versug2vau (hi691,fzuz lp5plw d37 jew q7s time graph of this object is

  An object is moving with constant non-zero velocnv kqj x0*eb: ;pqcz,f60oa(bity in the +x axis. The velocity ve (bcqva:zk0 b0jxep f,6q o*;nrsus time graph of this object is

  An object is moving with constant non-3u*7-3 :bm rhr qpynljzero acceleration in the +x axis. The velocity versus time gr rjp *hbqm7 nlru33-y:aph of this object is

  The slope of a position versus time graph gives20pu(*btt cqb wtbq,6p; *8lrfrd*qd+hp at :

  The slope of a velocity versus time grihks)/p tc.6faph gives

  The area under a curve in p 9h am -duyz./ qit-*mz83wcvan acceleration versus time graph gives

  The area under a curve in a velocity versus timesspwp2 ibo. .d *.at)cjtk40h graph gives

  If the position versus time grv dp ;5zxk0ha;aph of an object is a horizontal line, the object za;0x;v pd5khis

  If the position versus time grvkepo1z, k5ximdx20) aph of an object is a vertical line, the object is1pi20ze5m xd vk k,)xo

  If the velocity versus time graph of an ob80vew;o mqncpnk he1 o3 11w :ux)2wshject is a horizontal line, the object iskn2e 0p :qxo)mhuw1 ;hw1wovs1e c8 n3

  If the velocity versus time graph of af 3 pwlh/ t0en9d0rm0jn object is a straight line making an angle of 30 degrees with the time axis, j 0wdlt3 pneh/fm9r00 the object is

  An object moves 15.0 m north and then 11.0 hso e iyd bx36.)umz4 ,vixs/2m south. Find both the distance traveled and the magnitude of the displacement vector 6vhox,ied b3u2 s.s4) /yzxim.

  A boat can move at 30 km/h in still water.zj5ib9t,er q(s6i poe3 ,c7c c How long will it take to move 12 km upstream in a river flowing 6.0 kei qr,tjcbo3zc 5,s6c(i7p9em/h?

  55 mi/h is how many m/s? (1 utf/638 rygocmi = 1609 m)

  What must be your average speed in order to travel 350 kmkv242 xoiph8f-p scz( in 5.15 h?

  A runner ran the marathon (approximately j;sak58l .dpch-tl h)42.0 km) in 2 hours and 57 min. What is the average speed of the runner in m/spkdl;h- lh.58) csjat?

  A car travels 90 km/h. How long does it take for it to travel 400 usf 3p8vvr+szp347 .ulg yi.bkm?

  A ly (light year) is the distance that light:grpps.de i 8/ travels in one year. The speed of light ig/dp8:serip .s $3.00 \times 10^8 \; m/s$. 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 yoej,y34:h hw)qaiv dd hr(numg2o(( s:u look to the side for 4.0 s, how far do you travel during this inattentive pe ruhm2hs(:,(g 3a w)yhq(:jed4nv ido riod?

  If you run a complete loop around an outdoor track (400 m), in 100 )ri1l3 jr c-b)yrp;ym s, your average vpr )ib;1rj-)y3lmy crelocity is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 2: x-fddomx+mxmh89 bkm east, t xm xodmd-x9m +8b2h:fhen 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 speed?

  A polar bear starts at the North Pole. It travels 1.0 km southd)cl.5t t7dvj ;ny4gc:8 bpbf, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This v: bp. ydlc )4tdg7 cbtnjf5;8trip takes 45 min. What was the bear's average velocity?

  You are driving home onbql 4 1gsosl2mrl/nrm- * q1n8 a weekend from 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.s r/lnsl41om8rnbqg q2 *1m-l How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 16bizg/y x/j8xf xqn. 440 km at 100 km/h. What is the average speed of the motorist forxx8/g4 z/biy4n f.j xq this trip?

  A motorist travels for 3.0 ciqxa;c4 4 bwm;5 h-hnh at 80 km/h and 2.0 h at 100 km/h. What is her average speed fo5xh hi4;4wm ;na-bccqr the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 25aij5xs *.n7ii 0 mi/h north for 750 miles. What is the ai jnax5i.i7*sverage speed for the trip?

  In a 400-m relay racdlz7;:q3ls 5 n)aimvq e 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 runqq5 3zi)s mv:n;l7d alner starts the final leg of the race, in order that the team A runner not lose the race?

  A car decelerates uniformly anf0w 2nxvr z6ur3nrbwt:s9/ g:d comes to a stop after 12 s. The car's average velocity during deceleration was 30 km/h. What was the car's deceleration while slowib ::un93w/ rsxvzgt r2r60f nwng down?

  An airplane increases its speed from 100 m/s to u2bsty9).r:z ttps1a160 m/s, at the average rate of stp 1tz)a 2brs9 ty.u:$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rate of 6(/x3pmx /1 pwvxa zwe$2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from rest andzxqifq7+o f b)+* 6kap 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. It then speeds up with a constant accew2wy9hcafl p*;y: ag0 leration oflpy: awfwa c*yg 09h2; $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 7.4 m/s experivxsog grhrq5j4 1q0bc8 / lq3-1 ohi/gences a constant acceleration ofo 3j-0g/qvgbh1r q/ql4 xr5 gcoh1 si8 $1.0 \; m/s^2$. What is the cart's displacement during the first 9.5 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed os2nqh-tvq4 (k f 469 m/s strikes a sandbag and penetrates a distance of 68.97 cm. What is the ah- 4qkvtn( qs2verage acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a cata59zm i b(4vvc3pmyxfu. ohn8*s+ wdi ,pult 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 acceleration is constant, what is the lenmvfb+n,sz i9. mu(i 83yvp och4xwd*5gth of the catapult?

  A car starting from rest moves with constant accel+2ofh c9pu-t4mog/ l,+ jug byeration 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 is its avw31vy ohetwwli. q 5v:3kp.x9 erage accel1 :o.y.twe9wx hql5p 3iwkv3veration?

  An object starts from rest and undergoes uniform acceleration. During the firs,hyh jdx)7 a2/+vfbs tt second it travels 3.8 m. How far will it travel duri,7+ txbj)2 av/hyfdhsng the third second?

  An object is moving in a straight line with constant acceleration. Initiallyezz h2vyln510 wj n0m/ it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does y5n 1lje h0mw/nz2z0v it move during this time?

  A car starts from rest and accelerates uniformly z,p a,g mq ,yvxk8 )(nwr/l+yuat $3.0 \; m/s^2$. 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 ohic85txaaim+ i 49l/(o8kx5ln9m jkat 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 qkb:jr)gt .2hhas been waiting at the intersection starts ahead with a constakr)gt2q .jbh: nt 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 planet X whe8hdux 3jt8qe;mq(5f b9 *uaed re the acce j b8qxeuh;u5*q3dtf(adm89 eleration due to 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 ont +17r)6 inwuv1yz dlx the surface of planet X where the acceleration due to grtz61nvli )u71 dwr+ yxavity 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 k3q-zdr6 vh2v fmc8zeky( 8n5speed of 15 m/s on the surface of planet X where 5e- 3mq8(h 2dzc8nfzykvv 6 krthe 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 plaj;p ;qw)kbd0gn axt;7net X where the acceleration due to gravity x0p; kj;bwt7 qdgna;) 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. eructvf8k fx p-p ao 6*5d*2-c If your friend holds a ruler between your fingers and releases if *k856vfxa-r-pt*c 2epcodut without warning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward ayfazrf .b e/i96i3l d+t a velocity of 19.6 m/s. What is its velocity after 3.fbl/ 6y i a3+frzei.d900 s?

  A bullet shot straight up returns to its starting point in 7 s. What is th82z0rc5qum o ae initial speed of t02ro5 8ucqamzhe bullet?

  A ball is thrown straight up with a speed of 36.0 (q3 pjxxtx d2 ki7qz-(m/s. How long does it take to return to j2ptqkd3 - 7xzixq((xits starting point?

  A ball is thrown downward from zjw9g9r5i(5ayfcn sk 6qb.h6 the top of a building with an initial speed of 14 m/s. It strikes the . (rbk5jzfn wsg 9aq69 5i6ychground after 5.3 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s.71u158o p9deg 3tuxkgtf zhk 2nf5fn6 (only fill in numerical value in the blan9nfxef81t5t57 2ku oz3 pfhknd 6gg1u ks)
(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 u phx wh;qg1vc72sqp, e+ c v3rdo5*+pair with a speed of 31.9 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 5 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 5.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the veloc,gqk :ddf1n35:p )inq c-p mrg:qpaw(ity at t = 1.0 s?

  In Fig. below, what is thescl*8- h0wjke velocity at t = 2.5 s?

  In Fig. below, what is k9 tt1zhpbzbpmc03-7the velocity at t = 4.0 s?

  In Fig. below, what is the veloc xj+*kfkg1h i)ity at t = 5.5 s?

  In Fig. below, what is the average velocity from 0 to4+ ru fp..dccp 4.0 s?

  In Fig. below, what is the average vx5uj v*ts(jzob q .4+or5g6icelocity from 0 to 6.0 s?

  In Fig. below, what is the accelerun ya5/5 - ,mstmmxft-ation at 1.0 s?

  In Fig. below, what is the acceleration at u-8y3tjo)tk: xq/j2 ozuzu*r 3.0 s?

  In Fig. below, what is the aazd-b;jnmc7o j1m f8xq64 z6dverage acceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration f,7fkt *i4icph rom 0 to 8.0 s?

  In Fig. below, what is the disp+1q 8t/dphuz++z lq wplacement from 0 to 8.0 s?

Does a car speedometer measure speed,zb0yehdmt e;*p,z 5i2 velocity? {speed|velocity}

  An object can have a varying speev 4fo1r/sopm- d if its velocity is constant.

  The velocity of an object can be negative when its acceleration is posmq 7p74i kpydyg9 oj2;5m tc(mitive.

  If one object has a grcvu40tfb*w x b( axl(;f3,xpo eater speed than a second object, the first must have a greatep *blb(;fuxa0f tv(cx4 , 3xwor acceleration.

  Two cars emerge side by side from a tunnel. Car A is traveling w;5uxjy./ qilg ith 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 incre ij 2ux1tcvht*l;06x8e nhwh;asing in speed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the air. i )hx)4k/zey8hjm5(lyodys) u2j tvl r,ak*0 It leaves the bat with )lyd(v rt4si02a,8h)u h*5 meljok yjyzk)/x 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 l()rt/ j z 8mxqnrml/f3 95teyits acceleration, how does it change if air fric/8j txmtln r9fmr(e/l5 z)q3 ytion is ignored?

  As a freely falling objx9t(;d p0 ufr0tjq5hhect speeds up, what is happening to its acceleration, how does it change if air friction CA9fuh t xt0pq r(0j;hd5N NOT be ignored?

  An object that is thrown vertically upward will return to it 4+b p+lskc2sks original position with the same speed as it had initially if air resistance is+4 lcs2+kpkbs negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration at the same5cxtszcx*5lht 7 j xcp3c kur78n7 /e( time.

  An object can have nonzero velocity and zero acceleration at the sayi thwslsu:w(4c 9 t 4wk3igl8bi4 e6)me time.

  An elevator moving from the 3dsc8 vx(b7 ky /23mid 7ctl4of yt4aosecond floor to the fifth floor making no stops along the way has zero acceleration all th7ydbc4m d3 8ovy3 (xttl2c7ifso4ak/e time.

  A rolling ball movesf t wxffz5/.y* from $x_1=3.2 \mathrm{~cm}$ to $x_2=-7.0 \mathrm{~cm}$ during the time from $t_1=2.0 \mathrm{~s}$ 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 $t_1=-2.8 \mathrm{~s}$ is at $x_1=2.4 \mathrm{~cm}$ and at $t_2=4.2 \mathrm{~s}$ is at $x_2=7.4 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a qua7/ u dikks8 jtnfa:5ubi.7 b/frter-mile ($1 \; mile = 1609 \; m$) track in a total time of 6.5 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 line, moving 10p9.y qgjfp,n e, *g6cd7 m away in 10.2 s. It then turns abruptly and gallops halfway back in 4.8 s. Calculate (a) its average sp.e g9 g6jcppn,* fdy,qeed  (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 fro h0.wsw6 ki;vm)smp s8m $13 \; m/s$ to $23 \; m/s$ 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 6+bw a/pch ,gn$20 \; m/s$ to rest in a distance of 63 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speednpvx6yggw(5t0. 4*jc g( dsa d of $32 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.9 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially top sp+ p74yf. (4drac/:nrjk pig kqeed about/q4 +pc7 f4pn( :rirgdykjk .a $11.2 \; m/s$ in the first 11.2 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 /rktt rut0tfl3- z0k.speed of $18 \; m/s$ to rest in 4.69 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid mwlwx +b 8iy q/wan ;tutx:g9 g;qcg/+)arks 92 m long on the highway. Assuming a + cyal) /;9t8:bgqug+/qw gn ixx;wwt deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck going ekp+ ss-m*/qvci:5 pf$25 \; m/s$ 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).    $m$