Suppose that an object travels from one point in space to another. Make a yolk oqd2rn )8zfrj ;ue;5/c:comparison between t; q/yk):fozdr8 ornjeuc ;l52he displacement and the distance traveled.

  When is the average velocity of an object equal to the instantaneous u(-sa bz7mw5 qvelocity?

  A new car manufacturer advertises that their car can go "j9-n8o;e aqa cfrom zero to sixty in 8 s". Ta9;-8anjo c qehis is a description of

  An object moving in the +x axis experiences an vypn )w7:-iyzacceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) beginsz2csfnw, d -a8 to slow down as it approaches a traffic light. M2d c,fnaws z8-ake a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x p,ji5oh3r( fe direction) begins to slow down as it approaches a traffic light. Make a statement concernin,rjp h 5oie3f(g its acceleration.

  Suppose that an object is movibfah6ny 9543d-y mkgapz,vj fn.d s;.ng with a constant velocity. Make a statement concerning its accelerahg mszaf5j-f6na. dk p;b.yy,9vn d34tion.

  If the velocity of an object is zero, does it mean that .i1 yy.bv3dn hfh7h,*g f3cjcthe acceleration is zero? Support your answerd y*13jh vc hf.7ni,c3f.bygh with an example.

  Can an object's velocity change direction 1y gic 7g.8 wyq.5pyuiwhen its acceleration is constant? Support your answer wit p.cy5i i.qg17y yuwg8h an example.

  Suppose that an object is moving with constant acceleration. Make a statemenmndd0yt+ m- .xt concerning its motion with respect to time.m0xd.-+dm ytn

  Can an object have increasing spe5l:z, mbiuq go 91m/)p k+s-fa;yqy noed while its acceleration is decreasing? Support your answer wit uk 5+9q1zo ,by)isgofnam-;mlp/y :qh an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of hgm+)t9 oo6tc ice. Make a statement co+9 6h)tto ogmcncerning its acceleration.

  Under what condition is average velocity emx)zb7s dt)* 3)woup zqual to the average of the object's initial szd)p x*wbu ot)m 7)z3and final velocity?

  Objects A and B both start at rest. 1qd7vhkv pwhd+b:e t s n2 sg4:mn0.d3 They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compa4eh +:vtdq g0dw37s:.npbm1hnsdk2 v red to that of object B?

  Objects A and B both start from rest. They both accn9i jhgsc3*cvc, u+o 8ryhd/8 elerate at the same rate. However, object A accelerates for twice the time ad, yc8iv8g3sncc hrho*/+9j us object B. What is the distance traveled by object A compared to that of object B?

  When an object is released- qf76kc) )7oq5qpyc+zgm cgf from rest and falls in the absence of friction, which of the following is true concerning its motionk-ffg +pqcyqcg))77z o65mq c?

  When an object is released from rest and falls in the absence of 4mfwr0 y -zp9voztn/j/8yio0 friction, which of thf8r zy0m -t0p9/o4vywi/z no je following is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about t pczy;re8gm3j; d -r-zjjsm01he velocity and the acceleration w8p 3jr;j10dm-gjczz e;m-r yshen the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration just befor7,upk fq2 lsf1e it reachesqlfp27f 1sk,u its highest point?

  Suppose a ball is thrown straight up, reaches a maximum heig-q; o5 v)2ugzr2wzcrzht, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ba-z ) 2o wz;qrr2cvgu5zll is going up.

  A ball is thrown straight up, reaches a maximum height, the b mzydcp :nt7g0wuprp+59-bbz**u l2 n falls to its initial height. Make a statement about the direction of the velocity and acceyu 0ptzg zbd9-blc 27w*upbn *r+5m:p leration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistance. M /a-nvjv-tkt30ra;b( fid cl 2ake a statement concerning its acc-l0in;b2fj(/a vkt vd-ac3 r teleration.

  Suppose a skydiver jumps from rq-d 2 xoi(1z-e(wfn pa high-flying plane. What is her acceleration when she she reaches termi-1-feox(p w in(2dzqrnal velocity?

  A ball is thrown vertically upward withobvi7;z9 759jarti ift*z7 l(w m.toh a speed v. An identical second ball is thrown upward with a speed 2v (twice 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 thbjo7 t t9ii 9zv7 r(lt.;haz o*7ifmw5e second ball go than the first ball?)

  Ball A is dropped fro fkn5b):oxa ( cw:zqv.m the top of a building. One second later, ball B is dropped from the same building. As time progresses, the xqa(o) f w.v5b:kc:n zdistance between them

  Ball A is dropped from the top of a building. Ou1: dow5xnv 2one second later, ball B is dropped from the same building. As time progresses, the difference in xw2ono1vd 5: utheir speeds

  Two objects are thrown from the top of a tall building. One is thrown up, anapjmf ljtk6 :,(6d ;bhd the other is thrown down, both with the same initial speed. What are their speeds when they hit thebh;m:fj(td pa6k j6, l street?

  A brick is dropped from the top of a building. A sejj(crz;f kclf+ :0riz-o*6wh cond brick is thrown straight downj i fflohzr(k-*+ c:r06z;jwc 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 with 4;s ec+ev26j c,eeqom constant non-zero velocity in the +x axis. The position versus time graph of this object i,csv6;24o eqeej+ cme s

  An object is moving with constant non-zero acceleratioik*pg ;/g(za(7ci+j eew v/iyn in the +x axis. The position versus time graph of this 7cze va+j(*yeikiigpg /;/w( object is

  An object is moving with constant non-zero veloc rr19yxqw-gky73p8m-q a9bo p ity in the +x axis. The velocity versus time graph of this object iko1 9pb-g-m qyr 8xarpy3qw97 s

  An object is moving with constant non-zero acceleration in the twz) x.c/kaa1 +x axis. The velocity versus time graph k.a z tw/a)c1xof this object is

  The slope of a position ve nz4vpdaa;):i rsus time graph gives

  The slope of a velocity versus t2(ccqm/l.jtxo5ix jjl9 kiql*3 id/)ime graph gives

  The area under a curve in anvh7t*g xo+mf 0sf;4 sm acceleration versus time graph gives

  The area under a curve in a vd h;h0 ktezdf*1(z*l uelocity versus time graph gives

  If the position versus time graph of an object is lzs, l0v72x pza horizontal line, the object 07lzls z xvp2,is

  If the position versus time graph of an object is a vertical line, h-oefeyb/ q3qvi:af r+ q/ jmtn1a;*7 the object ism 3/b yae+f;:iteaoh j7r-qf1n /qvq*

  If the velocity versus time8, meizieer2v8:w) a /orquq ) graph of an object is a horizontal line, the object i q/mr,euo )a2iq8 z ere8)wv:is

  If the velocity versus time graph of an object is a straig7nq- q(;w)n. 6jbf d mtcgy h.ba6qw6jht line making an angle of 30 degrees with.7wj-h 6q gn66tb;a mwy (j.qn )dqcbf the time axis, the object is

  An object moves 15.0 m north and then 11.0 m sou 8t7oebh(btw.th. Find both the distance traveled and the magnitude of the displacement vectorbeh( .bt7w8to.

  A boat can move at 30 km/h in still water. How long will it take to mks)noyezp4 5 ghd. ilrb/)ym3:hj2 0xove 12 km upstream in a river fjhr): 23o h4 ek/5pbnz0l )yxim.ydgs lowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1h we3-,hm dir7 2zhd(h609 m)

  What must be your average speed in order to travel 306ut/kha7)o sl ec mcf 2e+mwt ;yj,j750 km in 5.15 h?

  A runner ran the marathon (approximgjelqkca s*78dwh ou; ;*a9+fately 42.0 km) in 2 hours and 57 min. What is the average speed of the runner in m/s?*8ahc;f;glok9 a wuq s7 +j*ed

  A car travels 90 km/h. jxel8 fp2ls)cnj+c7 cb2 xq1/How long does it take for it to travel 400 km?

  A ly (light year) is the distance that light travels in one y ;az) 5ok;odo 1di0xisear. The speed of light isii0 o1; ok sxzod;5)da $3.00 \times 10^8 \; m/s$. How many miles are there in a light year? (1 mi = 1609 m, 1 yr = 365 d.)

  If you are driving 72 km/h +cj0 6ju0woi dalong a straight road and you look to the side for 4.0 s, how far do you travel during this i0c0ji6w+uo jd nattentive period?

  If you run a complete loop around an outdoof hqzq.:c) o,xay39adr track (400 m), in 100 s, your average v.a ac:xh,3 )9 qqfydozelocity is

  A polar bear starts at the North Pole. It travp 1n:6kqv,vgl im*,qlels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to i1:lq6l,p* ki, qnmgvvts starting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It travels sm,yl)u8l3 h.akx jk7 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. jh)sk a u8.l3kmy7lx,This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from scnop99n d tm9y8hool 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. How far is your hometown from nmt998n op9dy school?

  A motorist travels 160 km at 80 km/h and 160 km ayxdwre4)r d1 -t 100 km/h. What is the averagerrdxd1yew -)4 speed of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 1 r 4:u4 i*dpg/ju*fggp00 km/h. What is her average speed for theju/ p*f4*ugp4r:gdi g trip?

  An airplane travels a: z;x3/xwbljr 6(geyj y7d((ls 2odjet 300 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. What is thejjeyd;(lrzx3dl/b6j o x2s (7e( g: yw average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs t +hrkv f53hsgm3-nr83 di:j- xq1wkdbhe last 100 m) for team A can run 100 m in 9.8 s. His v -3:dbjk58qrdn-i+ k3xhfmh13rw g srival, 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 team A runner not lose the race?

  A car decelerates uni6(zxvac0i/m (xfv w nt(9xb6r formly and comes to a stop after 12 s. The car's average velocity during deceleration was 56 km/h. What was the car's deta /6 v(vm0 r(6zi(n9c bxxfwxceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at theo k 9x9jff9,6reqfwh3 average rate of oe,r9hfwjxq f9f3k 69$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the ra7/orx eb.l9vp 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 reg g:jj1g3azl:ya0;wi1z;xos + q s+iyst and 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 5 2.lc6ua*0 j ynhxy)or7i ce hiw0m*dconstant acceleration ofwjny*6*hreo.i70chicdl 0m y5x 2u) a $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 6.2 ,9g ; de: w/lkq/ex.xnve szq+m/s experiences a constant acceleration oez,eeq xqlx+9gkv//w:dn ;s. f $1.4 \; m/s^2$. What is the cart's displacement during the first 7.3 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed of 202wy uqed(lg0 5m02.x.g :hnp wjgx 6+kd m/s strikes a sandbag and penetrates a distance okg q+06.xw 2d ynl50(.:eh jgpxmugwd f 62.08 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catadz*ea*v0ius19 uesj ;pult on an aircraft carrier. It reaches a speed of 42 m/s at the end ofjus ued0ae s* i1z9v*; the catapult, and this requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest m1pg /ororf- o9rd*)efoves 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/sq87k3:sl erxq) )6yq/hhef0rg , yhe e2 otwa. in a distance of 200 m. What is its average acceleraso)k y7eq/rh0 e 3hqgftel2: xwah )y,.r86eqtion?

  An object starts from rest and undergoes uniform acceleration. During th bbgt9n8k g jjm6+n4e3e first second it travels 5.0 m. How faemk ngtbb n649+jg38jr will it travel during the third second?

  An object is moving in a straight line with constx(ie er7err1/e+*ou6 erq c5dant acceleration. Initially it is qe5*errexd(7e ire r1+u/6c otraveling 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 acceleeio.of w/t: o4j +q*r,3te mvkrates 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 tiredxv++, sgmta .s on a dry road can decelerate at 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 lighpl9gps:yoc*) z2j6yu;gzsrtk g*, -t t turns green, a car that has been waiting at the intersection *6ksp ),gugcgo z -*9ryy jt2s;zlp:tstarts 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 withl 3qc5 ixrd2*s a speed of 12 m/s on the surface of planet X where thec 25qr di3s*lx acceleration 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 on the s vwl* ,+rzgf)ej;8ke wurface of planet X where the accele j+rew )*gl8;k,vzfew ration due 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 zrep u-p*+g4u)bgkthp. t,n/on the surface of planet X where the acce.z nekpgp4 -*bu+,pttg uh)/r leration 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 av2wh7mf e12 +uidk/g on the surface of planet X where the acceleration duu i127a/ hdg2v+mwkfee to 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.au 1yoey2dfrm b7er)jv5 ; r-i9u2 w3z If your friend holds a ruler between your fingers and releasdw2u1z2e7yr) -;ra3i e 9uvomrf5jyb es it without 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. )* aui3d u h++q owe)viqj ;4/qs;hn(nqyn oo, What is its velocity after 3.00 s?u 4jnei(h /; h,oa*o;u q s+win+o3qn) vqd)qy

  A bullet shot straight up returns to its starting point in 11 ihcpf6hgu0 1zwt4 1.ms. What is the initial speed of tcm 4z6h.01pfht igu w1he bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How longy/k e)gui2 kd7 does it take to return to its startik kued g)2iy/7ng point?

  A ball is thrown downward iym+hi4wos2 j -vr (u,from the top of a building with an initial speed of 11 m/s. It strikes the ground after 2.5 s. How -jv +2i oumrwhs4i,y( high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (onlj4aoqzw v*n 0ehv:3 p sexbbse)b(7gkmq+ (78 y fill in numerical value in the blank* vqsm ee(0xs+ )b(8oe34wkzapvb:g n77q hbjs)
(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 speed of 38.1 ml 3ieun76k xf7/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 13 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 13.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what iqzqvmbe3ze m86p;lmz y1o9m;wa6 .n(s the velocity at t = 1.0 s?

  In Fig. below, what is the velospg8i4 w g7r0scity at t = 2.5 s?

  In Fig. below, what is the velocity o). .jf(q hr(wcq;fm mat t = 4.0 s?

  In Fig. below, what is the velocity at t =rj-ast2e0 3d ltr +0qq 5.5 s?

  In Fig. below, what is the average velocity from 0 a-ywpx, om2x6vff 0r5to 4.0 s?

  In Fig. below, what is wh63 j:3s:fhmu wcqh 9the average velocity from 0 to 6.0 s?

  In Fig. below, what u3ggitg+rl9tn mx i8g -4f 84lis the acceleration at 1.0 s?

  In Fig. below, what is the accelerati6u4 8pugvk jj,on at 3.0 s?

  In Fig. below, what is the average acceleration from 0z5ph,tz 7 9,o /qr qx1uclbkv* to 5.0 s?

  In Fig. below, what is the average acceleration from 0w:+ 0ckc.1eqw 1owzoo to 8.0 s?

  In Fig. below, what is the displacement from 0 toj:(;bk21tf0o k n)pxcvnk o:p 8.0 s?

Does a car speedometer measure speed, velocity? {speed|4a a1m0 uyvb-,3sxxv(v xyyq )velocity}

  An object can have a varying speed if its velc*h lc :t0xq;kocity is constant.

  The velocity of an object can be-kddals:l, zo xf+ .7m negative when its acceleration is positive.

  If one object has a greater speed than a second object, the first must have a*o4vx u gb1,c a/mf-8s 6hgg5b-cfeig greater acceleration.g4,bf-gg/x 1*euh 5 s af 8v-omcbig6c

  Two cars emerge side by siw *s:fqs) f5(kz6d qi(u.gh lode from a 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 increasing in speed as its acc7ut e0hq5,rof+f zij+ eleration decreases.

  A baseball player hits a foul ball straight up into the air (vgm09g1v4yn+ehyt nbt.up) *ef3 ef. It leaves the bat with a speed of fehn+bf)et( vy3ue v.gn4p0m91 tyg* $120 \; km/h$. 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 acvdl1u jk s6c60celeration, how does it change if air friction s60u6 lk1jdcvis ignored?

  As a freely falling object speeds up, what is hk.5q*gy boh 9happening to its acceleration, how does it change if ai o *qkhy.hbg59r friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its original fb+x qtf/wu ohc,v +:3position with the same speed as it had initially if air resistance is negligiblehf/t, bv cu:x +w+f3qo. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzerx p2qiyd7 c( exe5sf;4o acceleration at the same time.

  An object can have nonz,qmehv i76 vbr3w2u6 rero velocity and zero acceleration at the same time.

  An elevator moving from the second floor to the fift v):2b cawfag1h floor making no stops along the way has zero acceleration awaab21):vf gcll the time.

  A rolling ball moves fro vjm-2 r2pvdto- e1 -as3pxzi*m $x_1=2.6 \mathrm{~cm}$ to $x_2=-8.5 \mathrm{~cm}$ during the time from $t_1=0.9 \mathrm{~s}$ to $t_2=6.1 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.6 \mathrm{~s}$ is at $x_1=3.2 \mathrm{~cm}$ and at $t_2=3.2 \mathrm{~s}$ is at $x_2=8.4 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete,lfs0;hs2, rpd rggg+fja1 w jv-;g0g laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.0 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 88 m away iz*jf 4x3hbed ,zzho8.0 dm1y ln 9.7fzd b03 eh*4j.h,dz81oxlyzm s. It then turns abruptly and gallops halfway back in 4.7 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 fro/zpz/0 k tjje/ch,z(b fjwpy5 u,xv-:m $11 \; m/s$ to $23 \; m/s$ in 4.5 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 frodeh ; z*q7f) tv,27vumazqv -gm $16 \; m/s$ to rest in a distance of 73 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must rhz +o.1-h 5 jwsywai9geach a speed of $30 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.4 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentialdbomruj:u8/nzu :r y5pj84smz; /,cn ly top speed aboutbs ,mm4zp; ojy 8u/nrjn8zu5:/cr:ud $11.3 \; m/s$ in the first 12.5 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 uniforn(*osu.d we2g mly from a speed of $16 \; m/s$ to rest in 5.81 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 mqx o0z6x; -oi3 unv h:ewxkd2+ long on the highway. Assuming a decelerav3wo6xq :0k 2uin+hx;dxz eo- tion of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck go o .v/wcs81 :s j ii-psl1x28ksx4gmycing $25 \; m/s$ 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 30bv xu,il4)e.hd6ii 4tb 5(ke c.0 min. After exactly 27.0 min, there are still 1100 m to go. Th 4d,k.ecvlu i6h4)ix5 e tib(be runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$