Suppose that an object travels from one point in spac3hq9k m u.:i6+os nsmbe to another. Make a comparison between the displacement and thbmim3qou s+.9s:6 k nhe distance traveled.

  When is the average velocity of an object equal to thtmx-po 02*dmff0yv s :e instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero g ofvuu3w./6v to sixty in 8 s". This is 3 ugvow/u vf6.a description of

  An object moving in the +x axis experiences an acceleration -ugu.m)-idjuc op z2,of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) be9hpzw9 ib .+n p;rg 0tifnqw-2gins to slow down as it approaches a traffic light. Make a statement concerning its acceleratib i9rwipz 0.nt +9-qpw 2hfng;on.

  Suppose that a car traveling to the West (-x direction) 1ma3c2xb sb r 18lu*kzbegins to slow down as it approaches a traffic light. Make a statem zl2axb1* rs81mbu3 ckent concerning its acceleration.

  Suppose that an object is moving with a constant /2x6;6w ruky*1dfghg-c*x syn2d cd bvelocity. Make a statement concerning in2 gryxh2gu wd y1cxb/6;*dd6 s- k*cfts acceleration.

  If the velocity of an object is zero, does it mean that the accr;e nrnu otom7 gg64s) /vjn(7lmg2/peleration is zeroprgg7nno;v4n6t7mm)2 u/goe(r/s jl? Support your answer with an example.

  Can an object's velocity change direction when its acceleq1. n8,nkd0wk. r*u iul)h ywjration is constant? Support your answer with an exampleq8u nyjdw ,i )0.wkhrl1*n.uk.

  Suppose that an object is moving with constant acce w. 9eh zlrt37rr8zeuc yn 8gbdr85i+d(ol4 2pleration. Make a statement cg d8r4zb.t5doz8w8rrpuir2l e7c+nl y eh ( 93oncerning its motion with respect to time.

  Can an object have increasing kxjc.1b iq5pza 3l4:x.nnt* k speed while its acceleration is decreasing? Support your cnk 4x 5.z x*i1 :tbnkj.lap3qanswer with an example.

  Suppose a can, after an initial kiyq6rh0 t7 gm,wck, moves up along a smooth hill of ice. Make a statm0 7r t6hwgyq,ement concerning its acceleration.

  Under what condition is average velocity equal to thek8zhf 3o3(bnv u8 lh8h average of the object's initial andzvhhnu 8 8hl3ko8 b(3f final velocity?

  Objects A and B both start at rest. They o+j.f ec w-8 .1uphxozboth accelerate at the same rate. However, object A accelerates for twice the time as object po.j.f8+ o ehu-1 cwzxB. What is the final speed of object A compared to that of object B?

  Objects A and B both start from rest. say(j01r;zsmp /+c .jsb 3lnn They both accelerate at the same rate. However, object A accelerates sl ycns 1/nj0p 3bz.ma (s+rj;for twice the time as object B. What is the distance traveled by object A compared to that of object B?

  When an object is released from restuftf8l 5mbydg7 w +8f; and falls in the absence of friction, which of the following is true concernd5fg bm+u8 y87ftw;f ling its motion?

  When an object is released from rest and falls in thq1vp9y dn vig37 gzm3:c eyev1z()r(k 8gh;uoe absence of friction, which of the following is true co)(:7zg1(hvn dev 9r8zp3qy g g3ukvyemi 1;concerning its motion?

  Suppose a ball is thrown straight up. Make a statemew 4+ metj( z kqt8 so5.qowkn(tx32,hnnt about the velocity and the acc2tn 8w.qnmeqhowj5xs 34k( ,o t(t+zkeleration when the ball reaches the highest point.

  Suppose a ball is thrownuln.ws0,m4lfd j :3le)whl :z straight up. What is its acceleration just before it reaches its z:e4j, mwuwlh:3s ldlnlf ).0highest point?

  Suppose a ball is thrown straight up j7-jovv0f ty0, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity andjo7f-t0j0yv v acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximu rq a,uo:pg xx1tn.-qo8psn88h)l a)om height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball itg18, qsp up)qn8a)ox.r-x l8aho: n os coming down.

  Suppose a ball is thrown downward in the absence of air res osjq/cnzy -oi 1(0ub)istance. Make a statement concerning its ac cznq0o i1(-u/)ojbys celeration.

  Suppose a skydiver jumps from a high-flying ps +;po4wy ow2ulane. What is her acceleration when she she reaches 24uw w+opy;os terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical secoxng ycl6j ljb.k.k*) 7nd ball is thrown upward with a speed 2v (twice as fast). Whlxg ln67ck.) jbk*yj.at 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. One second l)3 *gr mg*u8m jw.j 5qcjmgj-pater, ball B is dropped from the mw-rj 8u)m5c .gg3**jmjp jqgsame building. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One second later, ball B i -6t+.2tp-enuzj7.5sth np hj*chixc s dropped from the same building. As time progresses, jenhj ui-pz*xc 65-.2tn7+ptt hsch .the difference in their speeds

  Two objects are thrown from the top of a tall csz1( wop9ju5 building. One is thrown up, and the other is thrown down, both wi(5 sw 1pucjo9zth the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top o;mw20dsco tl2 f a building. A second brick is thrown straight down from the same building. ;0tw2s l modc2They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with cj. .fm lv;bcs0r- fzpd5m(e:nonstant non-zero velocity in the +x axis. The position versus time graph of thjc dpf;sz-b0rme5l. (:. v fnmis object is

  An object is moving with constant non6mpyy p i-2;ev:n-.3nhpy wet -zero acceleration in the +x axis. The position ve;piy3.:w y-hv p2 nny6 mtee-prsus time graph of this object is

  An object is moving with constant non-zero velocity in the +x axis. p5hzks0empm.iwj :h9 07fb,b The velocity versus :bj.0 ipm975,zm fhewk0 hspb time graph of this object is

  An object is moving with constant non-zero azzq8 6s+ z(pbxcceleration in the +x axis. The velocity 6zbzzs x(+q8 pversus time graph of this object is

  The slope of a positionp- .zw 9;cz.*+e5tobqudua xp:he l*f versus time graph gives

  The slope of a velocity versus time grapxwz ehj3(3zfu bx .;)77 cqkuby42kufh gives

  The area under a curve in an +,s u:wdcxka2 yt+b g;acceleration versus time graph gives

  The area under a curve in a velocity versus time grmj::zp sv (*-5ggz):l t0j dtaz;jbxxaph gives

  If the position versus time graph of an object is a h1 ccrd7p 6*hip.ljmh* hs8e1forizontal line, the object icp81.j1lh*6m*s pid7hr fhecs

  If the position versus time graph of an object is a vertical line, the ob-v,2r puzbw -jw49m kkject iskvw-u4 , kzb9wpr2-mj

  If the velocity versus time graph of an object is a hzf9kut,)8ibt - 9kwodorizontal line, the object -dki)t 9u f9tozbk8 ,wis

  If the velocity versus time grasobfubl94w9 : wni; i11ui) klph of an object is a straight line making an angle o i9wkbs:o lu9bwn11;f4l )uiif 30 degrees with the time axis, the object is

  An object moves 15.0 m north and th a4)n-6 fy nei2/ddjgben 11.0 m south. Find both the distance traveled and the magnitude of the displacemen 46da)-dji/fngynb e2 t vector.

  A boat can move at 30 km/h in still water. How long will it take to ,qz))ty2t7e:gc wig;w nn9n qmove 12 km upstream in a river ywg cnntg)e7 )92 twi:n q,qz;flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mmwij;pi os80 lgec1x4hh;2k 6i = 1609 m)

  What must be your average speed in order tik +qyctz 0m54o travel 350 km in 5.15 h?

  A runner ran the marathon (approximatelcghv +bqu+-2 t3cdst ;y 42.0 km) in 2 hours and 57 min. What is the average speed of tt +d-qg23t sc;vhu+cbhe runner in m/s?

  A car travels 90 km/h. How long does it take f,f9 s39*i u9egywafn4bl3aw ior it to travel 400 km?

  A ly (light year) is the distance that light trav odo3a8 4bp6edyz1q 9.gvmo8 gels in one year. The speed of l qomgd3z6y4e o 8b18.pv 9aogdight 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 strt)e05 1 csy(lczi:n-mt homv5aight road and you look to the side for 4.0 s, how far do you travel during this inattentive periodco(5yhi :ctv 1 s-tmme)05znl?

  If you run a complete loop around an outdoor track (400 m), in 100 s, your av oh2 tdvs;3d y2ked(2xerage velocity id22yk3s tovdx ;( ed2hs

  A polar bear starts at the North Pole. It travels bu3 q; (tbi/x k0bbww11.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to returnwbq3k(0tbx1ub /w ;ib 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 south, then 1q /gtl2m7c j2c.0 km east, then 1.0 km north, then 1.0 km west to return to its starting potjgl2c/mq2c 7 int. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weege m/m o3ypb629x-/e/uotcrlkend from school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home afterepyg/um/ob/ c 3melr6x9t-o2 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 the a,nds0xjew.- 2b+v bcy,k 5kjb 1u,d jlverage speed of the b1d kc.-jdx , +lkn,0v2jub,5esjwbymotorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. w 0 o fbjt8a(qw6o 28oo0chbht n680bgWhat is her average speqf28cbo6b0 wbotw t0o68(n ho0g j a8hed for the trip?

  An airplane travels at 300 m8cgkq85kz kj0 i/h south for 2.00 h and then at 250 mi/h north for 750 miles.k8c05 kzk 8gqj What is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 100 m) for tea 7betw2vw 6muz2pz pq)+y+2xt m 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 largesp+wzem2up v6)ybz2 +tx72qt wt lead the team B runner can 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 uniformly a;c ro:19nn;v v- *fqrtty+jk haeq1+lnd comes to a stop after 13 s. The car's average velocity during deceleration was 56 km/h. What w1t+akfjv+cy9lrq ; :e- *qnt vor1hn;as the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the average r jc5tjp,hb04w/c 1osrate of ,0hb5 1j/w4pjrc o sct$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the ,5 n7c -q0ctxms+eaztrate 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 ao24)e0; vr1bw cf5mc to( iuobt $4.0 \; m/s^2$ 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 qpif e4v*cjbp,z ,m //acceleration of,zc *,i/vmjb ep q4pf/ $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 7.7 m/s experiences a constant accecg5.cyjae; yv fl9 n*h ,ms:l;leration of * fhlj. 5cyc9yglnm ;,:a; ves$4.2 \; m/s^2$. What is the cart's displacement during the first 5.5 s of its motion?

  A bullet moving horizontally to the gi8pjbhpy,hc.4 .r) z right (+x direction) with a speed of 418 m/s strikes a sandbag and penetrates a distance of 26.88 cm. What iz4,jg8r iph.pych ) b.s the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult ;evz0e/ u+jf kon 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 lekf/u0 vz+ je;ength of the catapult?

  A car starting from rest moves with aba; a(hong5xiu q-(4 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 80ym.a22mdm y)dp fhl1 * m/s in a distance of 200 m. What is its average accelerym2mp1 hym .fdl)d2a*ation?

  An object starts from rest and undergoes uniform acnm+ -:ey7r0lkj+1kq w-ptfz f celeration. During the first second it travels 1.2 m. How far will it tfek: - p w7fy0km trjlqz+n+1-ravel during the third second?

  An object is moving in a straight line with constant acceleration. v( ff1 bugg +ks2o.u*c Initially it is traveling at 16 m/s.+ub*ggo1ks(.f f2 u cv 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 uniformly 8g5e q 9q6njf9ren w0 lh;ki.pat $3.0 \; m/s^2$. 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 a7(.bkjl.rauhd/ 1.zx fk t 0gp l3bz1nbout $5.0 \; m/s^2$ 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 been waitingxk2g*w a t9 fido+d ;-ini6)ov at the intersection staxo+if*o wig96-idt a;nkv)2d rts 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 sobqw2 5m;- d rfg-ayu,urface of planet X where the acceleration due to gravruag5m2 f- ow;yq, db-ity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with.7yjuu6ymw5n a speed of 12 m/s on the surface of planet X where the acceleration du6y j7mu5n. ywue 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 utrz(r35 ioxy 7pward with a speed of 15 m/s on the surface of planet X where tr z53(xioyt7rhe 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 o*k6wo67ewjsfj (c *crf 14 m/s on the surface of planet X where the acceleration due to gra*6*6(sf cekr c owwj7jvity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is jd1z3 1b/db 0hkxf2bnusually greater than 0.10 s. If your friend holds a ruler between your fingers and releases it withoudb2nzbfb1k/10 h3 j xdt warning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. What is its veloc+uv r/bri* f)uity after 3.00 ur/fbv ) iu+r*s?

  A bullet shot straight up returns to its startys8/: hzwvz+wm 44k a+vlzx 6iing point in 19 s. What is the init4awiz 8+kwhm/vz yx:zv +4s 6lial speed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. Ho* h m,78r2uhn *r)uoi. ovvbgrw long does it take to return to its starting pb7h*umn 2.,*rgr io )ouhv vr8oint?

  A ball is thrown downward from the top of a building t. * phqw;eu,/idqa(zwith an initial speed of 15 m/s. It strikes the ground after 6.6 s. How high(ew,q h; ta*idz./pqu is the building?

  A ball is thrown straight up with a speed of 30 m/s. (otz ni6y8euz5 bg4z*ch6eza57nly fill in numerical value in thebiu55cgy *n6zh8t 4e zzaze7 6 blanks)
(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 sm *-cfwm)b8 w(x(g opt c)b+tntraight up into the air with a speed of 23.4 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 8 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 8.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is tf/ 8-g;q)ua4yva sjlv he velocity at t = 1.0 s?

  In Fig. below, what is the velocityz (ss6zbn:wpn .pb+nlh10-t i at t = 2.5 s?

  In Fig. below, what is th 0z)cr j/xa)vre velocity at t = 4.0 s?

  In Fig. below, what is the velocity q kut,w6gy78iat t = 5.5 s?

  In Fig. below, what is the average ve/g0t s; v gu lglpyi7l6.2v/iclocity from 0 to 4.0 s?

  In Fig. below, what i h4-sfoi)yj /as the average velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration abk *5zy.q (+c;jqry ao*e/4 qno p0igrt 1.0 s?

  In Fig. below, what is the accele6tnh+xq041oa qbyn h;ration at 3.0 s?

  In Fig. below, what is the average acceleration from 0 tmt 13 rz /kv+pqg5qng/o 5.0 s?

  In Fig. below, what is the3+jsbtd /yhfp 7+k6wf average acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 to 8.0 sk).3/t(6mux7bn zyyl4rtluaoz p3 , r?

Does a car speedometer measure speed, velocity? {speed eht76lnl83 qxqz4p d+|velocity}

  An object can have a varb)-tjq6:xw .u+p hbcv zo/ xt1ying speed if its velocity is constant.

  The velocity of an object can be negative when its anlynmng..x* d 6w5h fm-)+spgcceleration is positive.

  If one object has a greater speed th v+*krtbc (6gkan a second object, the first must have a greater accelcb*(v k6k+gr teration.

  Two cars emerge side by side from a tunnr3 mcj9e4-7 sdwh (sdoel. 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 acce,o 88xdu 4ofg8tvarxte .:y*n leration decreases.

  A baseball player hits a foul ::jl mn.f;o h6bmksy*rm:wh2 ball straight up into the air. It leaves the bat with a: 2:bjlkf m*hyo6.n :hmr;wsm 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 orcs5q*vtw9ez tim ,)+bject speeds up, what is happening to its acceleration, how does it change if aiec*mvi wsztt ) 95+,qrr friction is ignored?

  As a freely falling object speeds up, what is happening to its accele4u1ia7 : hf/ykma: card v4vd5ration, how does it change if air fricti: 7vc4va fdkim5 hdur/a4a1y :on CAN NOT be ignored?

  An object that is thrown p sucs5jdahp*o- x: meg ve(k./zj6 n ;c*3:oavertically 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, howz :x3/j g:c(s*m5ea;-p s .vajo6ocdk unh*pe will this result be altered?

  An object can have zero velocity and nonzero acceleration at the same timnv)ms/qe*aj .yo q)h:e.

  An object can have nonzero velocity and zero acceleration as9))l8 ue b vk:+,fw zgez2lm(se0v nmt the same time.

  An elevator moving from the second floor to 0q j0s/d 4hfmxthe fifth floor making no stops along the way has zero acceleration all04/xshq0 djfm the time.

  A rolling ball moves frp xpxq2dso)n :h9;rnjt 915bvom $x_1=2.2 \mathrm{~cm}$ to $x_2=-7.4 \mathrm{~cm}$ during the time from $t_1=1.0 \mathrm{~s}$ to $t_2=5.7 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.7 \mathrm{~s}$ is at $x_1=2.0 \mathrm{~cm}$ and at $t_2=3.4 \mathrm{~s}$ is at $x_2=7.6 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter-milef tk,5fhzjl:5(zsr73:6zq 9 w1xyk7uxrjf x z ($1 \; mile = 1609 \; m$) track in a total time of 7.6 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 95 m away 46f um: s f.mmcy 5)kwnzbez ,v)3d-gozcu2p+in 13.7 s. It then turns abruptly and gallops halfway back in 4.7 s.w4d3.-z zc ze:mk + )op,yg6buf m)vn 5fu2msc 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 cdppx505h(. z set.vy$12 \; m/s$ to $23 \; m/s$ in 4.7 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 dc1ov (i beopp* ep6.u (nd2xcvx/7/f $22 \; m/s$ to rest in a distance of 65 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach h8ylfbjro-; (a speed of $31 \; m/s$ 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 to essentially top+gq84bas lvq: speed about sq +blqg:48va$10.8 \; m/s$ in the first 10.5 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 uniforml)a,p8j3kzcr fo m7noz.9bqa(y from a speed of $17 \; m/s$ to rest in 5.14 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 0ts.9 oskag:0+c0 dwn q;hkc9sxqsw .6dm; lj m long on the highway. Assuming a decelerat0+tw;g 9km9wssk qcd cl.6odh0j0:s. xnq; asion of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a trucdm xd2u0: g:*etifa ;z8l cbh/k 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 less than 30.0 min. Af lqwx etx(hfhnr*k+5) h0zfrj;sw*6; ter exactly 27.0 min, there are still 1100 m to q)6l;f+tj*nfr;hhwkh5wx x(zs0 r*e go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$