Suppose that an object travels from one point in space to anotherm tvb,* q ub6x:dpc,f/. Make a comparison between the displacement and the distance travelu cf/vb6 *:mdp, ,qtxbed.

  When is the average velocity of an object equal to the instantaneous velocitb /xrfm+-y.fx y?

  A new car manufacturer advertises that their car can go "from zero ( hc*z))g ulo/4hgoqv to sixty in 8 s". This is ag hog/loc 4)(vhq* )zu description of

  An object moving in the +x axis experiences an acaaukdmf4d cu-.l tw8rxl76w 7 1p:y4 kceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East nzbbv+lhxb (ovsaql(15t; dwt-i 7t80o3 -mo(+x direction) begins to slow down as it approaches a traffxsttn i( 8b1+ h-wdolba73o5;vb(m vqzl- t 0oic light. Make a statement concerning its acceleration.

  Suppose that a car traveling th h twlr*1nb64o the West (-x direction) begins to slow down as it approaches a traffhh41* rbwln 6tic light. Make a statement concerning its acceleration.

  Suppose that an object is moving wi/s5d 5i) uusr zvpt3:pth a constant velocity. Make a statement con5d:psis/v) 3r zutp 5ucerning its acceleration.

  If the velocity of an object is zero, does it mean that the acceleration is zer8/ qx k ),5(gy5dyvi1q i rdw *(uvi3nwvx7hrto? ridydt7q n83 )*( ( xr1vvhiy,5igvu5 wk/xwqSupport your answer with an example.

  Can an object's velocity change directioo/9ec w47lpvm0 /j mkluu 1s+kn when its acceleration is constant? Support your answer with an examek/muj 91u+lls ovp74ck w /0mple.

  Suppose that an object is moving with constant acceleratiob( tw/xni:wirxqd61ro k2h:. n. Make a statement c1 :hb:kr wr(6dxi2xoqti.n w/oncerning its motion with respect to time.

  Can an object have increasing speed while its acceleration is decreasing? Su7e- xy6.r mie(kv2zblpport youey (xl miv z6r-k.eb27r answer with an example.

  Suppose a can, after an ia-bjqo w0 eym)j 28cy*b q/+zxnitial kick, moves up along a smooth hill of ice. Make am bo bw-ay 8y+*jcjex20 )q/qz statement concerning its acceleration.

  Under what condition is ns6 1goxp-,/sk7aq y,2sjm veaverage velocity equal to the average of the object's initial and finaasjxqeyv6gp/ 7k -,1nsm ,so2 l velocity?

  Objects A and B both start at rest. They botuyu,6n2 csoz bn4.mz)h accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to tsz)u42, 6bun co.m yznhat of object B?

  Objects A and B both start from rest. They both accelerate atrn, jcm)t7-v nlex;o g1n) iv: 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 cv;e1ni,: nx 7ogrj) t-nmvl) of object B?

  When an object is released frouog3n yfi2q*x3liu.94mg 6ii m rest and falls in the absence of friction, which of the following is true concerning its.u4gigni9 u 3qimyfo6i*x23l motion?

  When an object is released from rest and ft+(3 zcck3s/af2z7i(sz htgh alls in the absence of friction, which of thez3g s k hs(+3haic 72cttzf(z/ following is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the : s58xm lxy: t huae.9*qfz;givelocity and tu: gazl5.9;eixsfhq:xy* 8m the acceleration when the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration just before itz*7izs vj l+x(yw 8n3v reaches its hixv v8l(zz +ys7jnw*3ighest point?

  Suppose a ball is thrown straight up,*01;dy atol.w(amhrt reaches a maximum height, then falls to its initial height. Make a statement about the d*0 ;(mhla1aw.o tyrtd irection of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then fallsw fk-s7*pmi7y+r gwx/ to its initial height. Make a statement about tw+7i/y-frkwpx 7* sgmhe direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown dowi 1t+ow1zetjd v5:)khnward in the absence of air resistance. Make a statement concerning ittj+ivtzd 11) kh5oe:ws acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is hz0 yv5kqb ;yyab 7*)5twqhb.uer acceleration when she she reaches terminal velocit;*5yu 7qqat) 5bbvz bk.0ywyhy?

  A ball is thrown vertically upward with a qp ) nqp )4kcn)jg+boc7yd2k5speed v. An identical second ball is thrown upward with a speed 2v (twice as fast). What is the rak)k ))cpo j+d ycn4b7 2qp5gnqtio 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. One second later, ball B is d1gu7g+ f b dyk2(cgs dt)a+y0 t/eg8ylropped from the ky8dd7t0ggeb/y )yc( +atu+g fs1l g2 same building. As time progresses, the distance between them

  Ball A is dropped from the top of a building. On) d;pvjn0e ce 1.0o dangv3cf8e second later, ball B is dropped from the same building. As time progresses, the differencen eop d.gdevcfnv3 )0j8a1;c0 in their speeds

  Two objects are thrown from the top of ;w9gl2(5 tdgowi s8l l4hh kj2a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when theykw9h2igl2llh(d4;5ws gojt8 hit the street?

  A brick is dropped from thtk 9cm;jq tbp1cc *eu)n(mo)/ e 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 the accelerations ot tu;o/c9 nb)mjc(c1p mq* ke)f the two bricks.

  An object is moving with constant non-zero velocity in the +x niww.c6g fje96: 8pdyaxis. The position v c698:giewf6pjy.nwd ersus time graph of this object is

  An object is moving with constant non-zero acceleration in the o2jg( hhc gr7vwg4;,v+x axis. The posit7cg,;hvj(hg 4w2 g ovrion versus time graph of this object is

  An object is moving with constam0w0u y+avz a2nt non-zero velocity in the +x axis. The velocity versus time graph of this objectu a0+vzy 02amw is

  An object is moving with constant non-zero acceleration .,m5oz j 51a-ytwhyp lin the +x axis. The velocity versus time grapola-tw. 5j,y5zy1 hmp h of this object is

  The slope of a position versus ti: xd)hr ;k6n;pgbjus1me graph gives

  The slope of a velocity versus timed zq;7lw; 8(j4x:psjt mky;qt graph gives

  The area under a curve in an acceleraa0u*zn eq 4(emgmuo .4tion versus time graph gives

  The area under a curve in a velocity versus time graph gl/d q76lamlsi 62bdtss .l* 3eives

  If the position versus time graph of an object is a horizontal linm:6 tw s*6y pbp9fshw*e, the object i *s*w6bt s:yf m6wpph9s

  If the position versus time graph of an objecltsr-rg,v+6 o t is a vertical line, the object is,t+- lsvg6ror

  If the velocity versus time graph of an object is a horyinugoeo/ *th) l8 9.zizontal line, the object tn*yuzl hgoo .i89 )e/is

  If the velocity versus time graph of ax6:hw7xyl9 k+vzb5g vn object is a straight line making an angle of 30 degrees with the t l:x9+ v75h6gkwzbxvy ime axis, the object is

  An object moves 15.0 m north and then 11.0 m south. F:l61:ul.l7ae bj ) grka- aqbpind both the distance traveled and the magnitude of the displacement vecto. bjal:pl -e6a 1q bkr)a7:uglr.

  A boat can move at 30 km/h in still water. How long will iga2otj :q//ldt take to move 12 km upstream in a river flowing 6. t d:g/2ajlqo/0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609 n5 rim/mdzf-0m)

  What must be your average speed in order to tri . pny,mauuf4jr- c-7avel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) ire ,1/k*taqnj1 r-k evn 2 hours and 57 min. What is the aver/ j-r1n,t* erkqkve 1aage speed of the runner in m/s?

  A car travels 90 km/h. How long does it.9 u5 eqtujt pl6ndf(,-fhr clt5 tf20 take for it to travel 400 km?

  A ly (light year) is the distance that light travels in one3shop64dczf 8* 5jaeqy r6w 2uto 0dr6 year. The speed of lif628owz5r0d46atos j *ec6dqr3 yh upght 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 al)cvg;o* j ) b;uaam..,xwzuwiong a straight road and you look to the side for 4.0 s, how far do youuj w;czwa))mxi.v ;, .bao gu* travel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, yob nbqx9u)l/0wz4 7b1mu jt2vaa1jci*o t +) uvur averagejt4 wbz1a vmbo qj9 c/)xv2)tiuu*0ua+b17nl velocity is

  A polar bear starts at the North Po sb+nfz,:zf* s zq0mw:ezrs4-le. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to itw+-0 e fnfbz,::q szzr4 *mszss starting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts um) rej0gxlb.,tuk ,1 at 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 .tgjulm 1ukx,b0, e)r velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 mile/2gx.tre, /s njqir8 ks. It then starts to snow and you slow to 3gj i2nx.kse,t //8 rqr5 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 kmdu ac4v7x+:d0ghx gu.m j; 9ca/h and 160 km at 100 km/h. What is the average speed of the motorist f+axax7g.;gd:v0mc4 c hu9ud jor this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What,cq;uqvb:7rpl 0f9zm is her average speed for the lmq ,0:c7bf; p9zru qvtrip?

  An airplane travels at 300 mi/h s-rt.mh wqn p+5lli8)gq1 tye/ outh for 2.00 h and then at 250 mi/h north for 750 miles. What is the average speed for th)wrtieqn/1yt- m+ ll8qpgh.5 e trip?

  In a 400-m relay race the anchorman (the person who runs the last 100 m) fojzkg0qb,uuu bk * /80br 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 orderb ukqbjuk bg/ 00u8,*z that the team A runner not lose the race?

  A car decelerates uniformly and come:6 nd1ljqqw*w7pvwz9 pk- gi ,s to a stop after 12 s. The car's average velocity during deceleration was 48 km/h. What was the carq,w nw vgi- 69wlpp 7kq*1:jdz's deceleration while slowing down?

  An airplane increases 672ww kfbzc /ucn ym2gl2b4 -wits speed from 100 m/s to 160 m/s, at the average rate of 2 yuw-2 27 lcn/b4kwb fgm6cwz$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rayn)r+lq-8aae bf0 q 2jte 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 at cmefun1. w:d3$4.0 \; m/s^2$ 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 *f 07ix2wg4yg s-k ooxs. It then speeds up with a constant acceleration-so0 gigwx2f 4o7* yxk of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity6,+r0ldg fc9tvpjju ) c-8xpu of 2.4 m/s experiences a constant acceleration o-, jv6rg)9ppl+x u d jtfuc08cf $3.8 \; m/s^2$. What is the cart's displacement during the first 8.3 s of its motion?

  A bullet moving horizontally to the righm6is-mjoe b, 4t (+x direction) with a speed of 326 m/s strikes a sandbag and penetrates a distance of 55.16 cm. What is the averag m-m4b6joesi,e acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapu9t.i(azk*z zilt 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 (* zzti9zk.iathe acceleration is constant, what is the length of the catapult?

  A car starting from rest movesor umhr,38w 4k with constant 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 200 m. What is its average a1xqlj t0..prr ccelerat1xlrqr0p.jt .ion?

  An object starts from rest and undergoes unify;w3(n*jsg g qi7 p m4txf,en8orm acceleration. During the first second inq iw(3n4pygjf 7t,xm8g;e*st travels 9.9 m. How far will it travel during the third second?

  An object is moving in a straight line with constant akgsb p9lp(h0spj 2( l.urj29gcceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling atp klgjjl 9s psb0r. ((292pghu 10 m/s. How far does it move during this time?

  A car starts from rest and acceleratesi/ nsay 7dw( .pf9gwk y+)iu(g 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 decelerate at abozx0 0g-; jyx w9s*oukklebg )1fk0-hhut $5.0 \; m/s^2$ 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 xyjs e,2 zu(u. ,;oqwscar that has been waiting at the intersection s.uqs2 (je,yo;,zx uws tarts 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 wx18*gr0jdmbyqhr :8zq k 9;s upward with a speed of 12 m/s on the surface of planet X where the acceleration due to gravity isyw ;qdmb91q: *h zrk0xgr8s 8j $1.5 \; m/s^2$. 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 b38)zwj bog9twhere the acceleration due to gravityj) tgwzb9o83 b is $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

  An object is thrown upwa5uh48 hd2w86cg3*bn yai xgrjkd6) k nrd with a speed of 15 m/s on the surface of planet X where the acceleration due to gravity in85kgh6g2* y ba3 6ridxd jw u8)4cnhks $2.5 \; m/s^2$. 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 l1ezbs4 :jm0(fuq8qp m/s on the surface of planet X where the acceleration due toseu :l1mq(8q4 bpf0zj 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 frj nk4 awp,,u)liend holds a ruler between your fingers and releases it without warning, how far can you na lu)wkpj,,4expect the ruler to fall before you catch it?

  A ball is thrown upward at 0 6i:r ;io eyk-n+junja velocity of 19.6 m/s. What is its velocity after 3.00n:0jy- k;o6ne+iriju s?

  A bullet shot straight vum7z, 3/ l xh0 kok6ehci;7jhup returns to its starting point in 14 s. What is the initial speed of the bujuocm6k/7v hk7l,; h3 hz0 eixllet?

  A ball is thrown straight up with a speed of 36.0 m/s. a f uf-2fdm 3/6(dattxHow long does it take to return to its startinu 2md- f6tdffaxat(/3 g point?

  A ball is thrown downward from the top of a building with ang (vwz7d08pta udu1u- g)+umh initial speed of 13 m/s. It str7 vg)wdu-p1uzgdaum8u(t h 0+ ikes the ground after 2.7 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in num (sr83-lq5dc8riy uvmerical value in the bls q885- irml3dvu y(rcanks)
(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 stz 6ay7 z),em oadye,ek41nr+t7o-b q jraight up into the air with a speed of 41.8 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 7 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 7.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t 3zloe;z2c 9 cb+og. *ebudm-z= 1.0 s?

  In Fig. below, what is the velocity at t = 2.5da wy;es:7fe-.o7luvja 0er-4 a / pqd s?

  In Fig. below, what is the velocity at t = 4.0 vrwke:lc3x)2 s?

  In Fig. below, what *h gglg2w0ui xsd 30u6is the velocity at t = 5.5 s?

  In Fig. below, what is the averagec+ 6kr8*gvy9( jrzne g ynn645d9qoes velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocitdl /o4lp6(2 atal rav1y from 0 to 6.0 s?

  In Fig. below, what is the acceleratq6ntllb f/9njfe(5e a 6fcrje02/-u q ion at 1.0 s?

  In Fig. below, what is the acceleratio vfi0qsnfz()qr em-0 :n at 3.0 s?

  In Fig. below, what is the average accislf9ksn. /x i8fw. *heleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration fz,yco1blpj40 d-f7t f rom 0 to 8.0 s?

  In Fig. below, what is the displacement fromrfzx.k4 uors5x9 z)m* 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|veloo,(fy*oi7 t3n+iun eycity}

  An object can have a varying speed iib,bc/qjr* ( af its velocity is constant.

  The velocity of an object can be negative when its accelerao w/o7 aq9me h +yrr* /uc3f-pztx.qo+tion is positive.

  If one object has a greater speed than a se,b.l*m( 1h+cugtc 9pnby 8oiocond object, the first must have a greater accelertb*8 +yclcmgb.n o 1p (9uioh,ation.

  Two cars emerge side by side from a tunnel. ;u9imf6lqq2 q 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 a4 y utcq)wt0(as its acceleration decreases.

  A baseball player hits a foul ball strai mrj1-x9 kf.zxght up into the air. It leaves the bat with a spe.x m1 x-frjzk9ed 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 accelerationp 8fuq)o6(o2nz ixj2)mlhmn 82zs)qn, how does it change if nos)f2()h2 zx8n8iml 6 up mjz)q2qonair friction is ignored?

  As a freely falling object speeds up, what is happe/ermd5uym l16o 9mzx :ning to its acceleration, how does it change m/ rlzme9y:5 x1omu6dif air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its o.+r/5oph zzcqriginal position with thpzc.oh+r5 q/ze same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity andfym* .xye3k di -f)vl/ nonzero acceleration at the same time.

  An object can have nonzero velocity and zeroa 7o4tx;7y;k fbwyp2 h,v yz8k acceleration at the same time.

  An elevator moving from the second floor to the fifth floor ma ro-3u:ee 9/i-p0jwrhoe-kz eking no stops along the way has zero acceleration aijou/koh9w0re:-rep3z e- e -ll the time.

  A rolling ball moves froxz8kq6wm0wn (o 3( yfrm $x_1=1.8 \mathrm{~cm}$ to $x_2=-7.4 \mathrm{~cm}$ during the time from $t_1=3.0 \mathrm{~s}$ to $t_2=6.0 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.5 \mathrm{~s}$ is at $x_1=2.0 \mathrm{~cm}$ and at $t_2=3.8 \mathrm{~s}$ is at $x_2=7.5 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around ap1ql+rkk44 f1 o uo;-5qczzjk quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 11.9 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 stra w sp7uw)n-bz dzx/w:+ight line, moving 113 m away in 13.2 s. It then turns abrup7 dwx+n:/zswu ) -bzwptly and gallops halfway back in 4.8 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 ,.w91bg0xigprm 3kfi z* dkb4$12 \; m/s$ to $25 \; m/s$ 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 from ;dzcwvu2 i8,ig /5 fcl$17 \; m/s$ to rest in a distance of 76 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a spe*fyx: j1d/pmv2j qi:n ed of $30 \; m/s$ 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 out of the blocks t4 16aq9lffnxrc9 qgo 0o essentially top speed abouaogqn1x l09rffq6c 49t $11.3 \; m/s$ in the first 13.7 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 speena8 3yda +f1lvd of $15 \; m/s$ to rest in 4.90 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 m9wn2 pt *g,fjmionf06zio0 s7 long on the highway. Assuming a deceleratio79zw0fnj2ts ii 0mof*6 gpn, on of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goa* t;gp m9rm)d.cx3uc ing $25 \; m/s$ 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 less than 30.0 min. After exai(*2r5lrb vw4 bj:tm actly 27.0 min, there arlj r5mv2:(bi brwat*4e still 1100 m to go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$