Suppose that an object travels fro -hk2vvt*2ipkihs c75oyqs02 m one point in space to another. Make a comparison between the displacehos 7p2v* tq-i y 52h02kciskvment and the distance traveled.

  When is the average velocity of an object equal to the instantaneousj gua6 7 iuap.v;el*ke zn:w2rmx/ 6:g velocity?

  A new car manufacturer advertises that their car can go "from zero to s3 e,3bik/j hrgixty in 8 s". Thi,hj ek/3gb3 ris is a description of

  An object moving in the +x axis experiences an acce:o ff 9 u16fx ztcat9;dr-f2v2mx3bzpleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the Easttx- 282m1itp4gb fy roy.s v.l1srcu8 (+x direction) begins to slow down as it apirutb41 vtf 8x8 .p2s.-rm2 gys1ylco proaches a traffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to mb hd+ gk+3h+if:,im zslow down as it approaches a traffic lightb, h ghmd fk3iiz+m+:+. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Makixbf0c-l a3: b1,v gfce a statement con:abg 3x-0 bf,viccf 1lcerning its acceleration.

  If the velocity of an object is zero, does it mean that the acceleration i*ja 11 nl9puips zero? Support your answer 9i nap*l up11jwith an example.

  Can an object's velocity change direction when its accehs2w,oarhta /vt 4 +q.0tl*e rleration is constant? Supha ov,2.eqrt+*r4swt /ha0t lport your answer with an example.

  Suppose that an object is( qjosbvfay/6ekkx wo )c,47 a6-zw,yw9cs 4a moving with constant acceleration. Make a statement concera oa(4a,s7f wvyw9c kx-)wc6s/q6 obz,4e ykjning its motion with respect to time.

  Can an object have inco8u8g*mm zf8e.qw 7gyreasing speed while its acceleration is decreasing? Support your answgof 878qy8zme w* .mguer with an example.

  Suppose a can, after an initial kick, moves up along a sm .p76-cqybpxjooth hill of ice. Make a statement concerning its acceleration.c.jp-y 7pb6qx

  Under what condition is average velocity equal to the average of the object's tw; inzp)bpg,,2ypq 5initial and finp ;yq zb)nipwt25g,p, al velocity?

  Objects A and B both s:xv8oe j1zre3a.jh2+yc z9hstart at rest. 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 compared to that of object B?zea8 hjjoz 3rycve2 +9:s 1x.h

  Objects A and B both ktuxzubc9sm- joo6 (sfz6+ 0oe ,y-/n start from rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled -eyjoo6uxf nb -zz0tm9 6,c/u( +ossk by object A compared to that of object B?

  When an object is releasd;bse( 8oj rafqt86+uj r 4)vked from rest and falls in the absence of friction, which of the following iubskq 8 6fr( ;dje)ja+o vr48ts true concerning its motion?

  When an object is released from rest and hwx,u gf x1 t4jyn1a3m -lrrkc.r6z:,falls in the absence of friction, which of the wa, 4t31,x-kr6l1r nrygcj ufx:hmz.following is true concerning its motion?

  Suppose a ball is thrown straight 1 5 5fimpvxbb2up. Make a statement about the velocity and the acceleration when thfp5xivb125 mbe ball reaches the highest point.

  Suppose a ball is thrown straight up. What is2eir2hf z2.j fgc ah- ph+o16l its acceleration just before it rea1l.+ 2rjig-hh6a ohfz pf2c2eches its highest point?

  Suppose a ball is thrown straight up, reaches a maximum heightrm2ec,l4qnfp*.ni* (n7ztd8o o ebx.n ce :2f, then falls to its initial * nn.*nixrne dtc7eco:lo, f8(e 4f zqmb.p22height. Make a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maxim8ry3iq2mwm)nuc,34cp c8 -oww .wfkaum height, then falls to its initial height. Make a statemkrpnyai qw)c,4 m3u 8wwc.2cw 8m3f -oent about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistance. Make a s c)s0d ormhy :2 ekmxcn53g;i,tatemen syhc3 2m5k)d 0,:xigncr;eom t concerning its acceleration.

  Suppose a skydiver jumps fgk1 n*rr7,:ikx-nlb5wz vmuqsx .;7rrom a high-flying plane. What is her acceleration when she she re ;k xxn:7r rwl,mn5g q7sb1kizv*-ru.aches terminal velocity?

  A ball is thrown vertica6xbsw *2wf, wqlly upward with 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 timqw* 2, fw6wsbxes higher does the second ball go than the first ball?)

  Ball A is dropped from the top of a building. Onm ez(78zqycj/4w (6ippi5g jce second later, ball B is dropped from the same building. As time pryzzc(q w(8j7m 6i pp4/ce gi5jogresses, the distance between them

  Ball A is dropped from the top of a building.cb cbbw(;, h edg.5ld0+ prpx, One second later, ball B is dropped from the same building. As time progresses, the difference in their speed w;e,xcd r0.,cgbh lb5dbp (+ps

  Two objects are thrown from the top of a tall building. One is throj.7xg1*zppvq sq9 n4h yu x08qwn up, and the other is thrown down, both with the same initial speed. What are their .y *z1phvq80pxugxnqs49 jq7 speeds when they hit the street?

  A brick is dropped fromsvpur)na/xo6i8h j 19 the top of a building. A second brick is thrown straight d o8iu/x)rh9 vjaps1 6nown 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 constant non-zez-4wfe.xe *z;w -rjrbro velocity in the +x axis. The position versus time *zfr.-r ; eze b-jwwx4graph of this object is

  An object is moving with constant non-zero acceleration in the +x a pub :j0*y6tizuci3l:xis. The position versus time grap l:cj3yu uz 0*6itibp:h of this object is

  An object is moving with constant non-zero veloci f(n86x p;pxhvty in the +x axis. The velocity versus time graphxfh 6vpn(8; xp of this object is

  An object is moving with constant non-zern3k .+/ct+fmfa7x ru+mob hw+o acceleration in the +x axis. The velocity versus timoa7twfm+r+n h+u . mkfx+c 3b/e graph of this object is

  The slope of a position ve hu4jdxj- 50ajrsus time graph gives

  The slope of a velocit*s.c97x3y xz +xo viyludp4i1y versus time graph gives

  The area under a curve in an acceleraf6 1z7bxjcs .8uzr a*+qe:hqu6pd i(t tion versus time graph gives

  The area under a curve in a velocity versus time grasqtcb25 23ak 7swyoj7 ph gives

  If the position versus e7)+b y5zzppsi s+,netime graph of an object is a horizontal line, the object isspebs 5,7) +e zpyi+zn

  If the position versus time graph of a9y4zwtzsqi9j hzpxh6h 3b9-1n object is a vertical line, the object ish4-ibhqz3z9s9 1y6 hpx9 w jtz

  If the velocity versus time graph of an object is a horizontal lf677 a s7h:t8o qglnnoine, the object q: tgnso7h7o7fla 6n8is

  If the velocity versus time graph of an - zur f,bs.qr rv;al6t+(ik oehx q;e 9-*zi(dobject is a straight line making an angle of 30 degree+ bz-f q;-6a qk zoi,lierrhs v.( *9etxdu;r(s with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both+;;wr : wmimzd the distance traveled and themw r:wz+dm;;i magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How fpi2g w q2am28long will it take to move 12 km upstream in a river flowing 6 82fqmwgaip2 2.0 km/h?

  55 mi/h is how many m/s? (1 )1*yt;uaho osmi = 1609 m)

  What must be your average speed in order to travel 350 km ro :2yig135kwsx ky1: av+ud pin 5.15 h?

  A runner ran the marathon (approximately 42.034pmsn8f: riv km) in 2 hours and 57 min. What is the43rmsp 8fiv:n average speed of the runner in m/s?

  A car travels 90 km/h. How long does it ta,0w ;pkz :4 j*beuniecke for it to travel 400 km?

  A ly (light year) is the distancfev3q99*uvuw e that light travels in one year. The speed of light is eqwu* v 9u9f3v$3.00 \times 10^8 \; m/s$. 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 you 9 ikpic z h; 7etaue)rl-0(a0klook to the side for 4.0 s, howplu9e a- kz;t)h a0( keric70i far do you travel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 1mm0) mwi k2hf -l2fobpy d 47*ar1yfj uv5(wo100 s, your average velocity 2)bm71 fk mh(foofud-yw*y r 2 i510avp ljw4mis

  A polar bear starts at-7kw7/mco2n6 n)qelm2luv bm h e5v(w 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(wvv m)umon2e kmc l wle2- 7h65nb7q/ 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 south, then 1rlq +xr)l-7*cmk*dlx .0 km east, then 1.0 km north, then 1.0 km west to return to its star+l -x)7krldxr qm*l*c ting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home onf nn(jzp:p,*16 in tc)s:e piu a weekend from school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi(e*upi tpnns,j)c z16: p inf:/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 km/h and 160 km at 100 km/h. What is thei3 j*1ep .kytc xb*jm: average speed of the mot1 btpk xj3.*ijy :cme*orist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/nh3v l0d)t*z xv l84uth. What is her averagullzh dv *t v840n3x)te speed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 25(q.(dm4h (o+x tch2 wktwu*bh0 mi/h north for 750 miles. What is tho+(dwx (.hb*(4uw 2t q cmhtkhe average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 100 m) for(y0lb me+ q+h7ju7ma4jgvyg mv.flp/yru 4.8 team A can run 100 m in 9.8 s. His rival, /7v.u8pm m.mu (++yay4ybjjfrlq lvh074gge 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 uniformly and comes to a stja5/vey0ddx 7 op after 12 s. The car's average velocity during dea5e7xv d/yj 0dceleration was 52 km/h. What was the car's deceleration while slowing down?

  An airplane increases its sp/cky*bb*z1 mqvtx+rw h 3;8uceed from 100 m/s to 160 m/s, at the average rate of *qvy18uwtmkb cz3; + hbcrx */$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates k-x )70u1 dqs lku/7.pob-avqd qc3ugat the rate 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 ag 8ry ja hdmgc5ia a8 gr*d1:8km1u5g:t $4.0 \; m/s^2$ 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 cona +w(kol)vp 6n 9ga/qnstant acceleratio/ a+gk)lo 9v(naqwpn6n 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 5.8 m/si l97;pvvuk 6x experiences a constant acceleration okpliv ;7x u96vf $1.3 \; m/s^2$. What is the cart's displacement during the first 6.9 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a spbddpegese d* : +uc 05fhq2j+2eb5qn8eed of 209 m/s strikes a sandbag and penetrathqunp8s0dcb+j*252+ ebe ed: qd5f ge es a distance of 25.53 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrier. It reacpq0nyghg;* kf-- hfz75/ms p ihes 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 length of the catapult?q-;hg0 g5sn k /y7fz- i*phpfm

  A car starting from rest moves with constant accelerahme9eaoq hz:- npa;q, u7:9 prtion 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 /nz ikb yup f7v3p(rp-(8uc.am. What is its average accelerati (u8p/.pbynckvu z7p-3af(r ion?

  An object starts from rest and undergoes uniform acceleration.4h t,i/rmkuwdjl*u3 wz:+du.0 oqby8 During the first second it travels 1.9 m. How far wilb:ui3z djltuod,r/ m8 wkw.*+h04uyq l it travel during the third second?

  An object is moving in a straight line with constant acceleration.cw70 khi yl:l; Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during tk w 7lch;0ly:ihis time?

  A car starts from rest h8 4wr 17dhws8p l*cgtand accelerates 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 h9-csg26fw ah .(zat31 -k zci so.whqcan 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 light turnsjp 3b704udadf green, a car that has been waiting at the intersection starts ahead with 3pa47u d0 fjdba 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 with9;-67fs(6o e wt: rm voiuzeok a speed of 12 m/s on the surface of planet X where the acceleration due to g;o :omt6fkew76 9zoe-r s i(uvravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward wqyf(f/ e5 u/aeith a speed of 12 m/s on the surface of planet X where the acceleration due to gravi5/qeyeu/ af( fty is $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

  An object is thrown zcy+z *)b.tq:9hlbav upward with a speed of 15 m/s on the surface of planet X where the accel bqhzvyb9z: cl)+*. taeration 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 og4qfhrflks4 x t7 j0(1n the surface of planet X where tstj7g(q x4h1k 4rf 0lfhe acceleration due 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. If your friendktvh tjf;ou/gl(n7, 2+)d yvk holds a ruler between your f )utl ndv/o7+2,fkv(th ykj;gingers and releases it without warning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upwardlyg- c6 g87f,e exg8sb at a velocity of 19.6 m/s. What is its velocity after 3.0x-, 8c76gbg feleysg80 s?

  A bullet shot straight up returns to its starting point in 5 s. What is ioc2s1x0;:khz-s1 qxaije bzcb9) r 1the initial spcoji;)hb1s 2exx191 i:q br-0saz zckeed of the bullet?

  A ball is thrown straight up with a spec1pt 9:,s uapfed of 36.0 m/s. How long does it take to return to ita1p9us,: c tfps starting point?

  A ball is thrown downward from the top of a bj lop+ y-joh7(uilding with an initial speed of 11 m/s. It strikes the ground after 5.6-j(o y hjop+l7 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/sm/::1 x0p):jwfuxqr)yk z p uns19gpw. (only fill in numerical val)xnup:mg /qf9 :)u w ps1zw 0r:x1kjpyue in the 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 straight up into the air with a speed of 31.0 hvgcz r72jv7dgum6 g9 vb9 ;*nm/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 6 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 6.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what hfaf0 ,6* jhs*zmyf b.o)saj-is the velocity at t = 1.0 s?

  In Fig. below, what is the velocity89lzw lzx3 ;agi s.mn5 at t = 2.5 s?

  In Fig. below, what is the velocecnzt dq3lz13k3q :*r ity at t = 4.0 s?

  In Fig. below, what is the vel ((;agk7skjxzjxnz6 lpxih /:0-2.ffgb0mxr ocity at t = 5.5 s?

  In Fig. below, what is the average velocityi p b9 6r*qe/+yqzu 7ey0gh8jf from 0 to 4.0 s?

  In Fig. below, what is the avkj1 dj ue+be9+erage velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration at 0((; 7c ar7iss-ddd1ie bx vwm+d1mg m1.0 s?

  In Fig. below, what is the accelerc v5jb-)yik.ei9 l7s.nghg( gation at 3.0 s?

  In Fig. below, what is the avern-5;z l9 fepilhrbi9; f2viwol67i 2yu.g 9 eeage acceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleratim 2gie, b,;m)mev,n*seyi.d-r1 mdw ion from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0qfdysh2o -0e5jor k1(: rv4vx to 8.0 s?

Does a car speedometef .+ g:i 3oc8fcar5f sp.cfyjav5eb0 *r measure speed, velocity? {speed|velocity}

  An object can have a varg95/xxx/fzi oying speed if its velocity is constant.

  The velocity of an object can be negative whkeizcr2o e bl m;,r -xd99j.,sen its acceleration is positive.

  If one object has a greater speed than a seocxc8i j-:* second object, the first must have a greaterc *cs x-o8:eji acceleration.

  Two cars emerge side by side from a tunnel.v4gkpb: v d 4ubl jzpi6:2-nv4 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 accelerationm:+ 2ftwpt-eakr2 q7g decreases.

  A baseball player hits a foul ball straight up into the air. It leaves h6cw2n68ekyo)1rlf m the bat with a speehcfml6k2y nwro68)e 1 d 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, whatv(:vkxtpe8 n2pt-x2w uap / k4 is happening to its acceleration, how does it chantv :wk tnpx(ep a/-22kxpu84vge if air friction is ignored?

  As a freely falling object speeds up, what is happening to g0e:y44gi/j mwo ikb: its acceleration, how does it changje4b/i0:wgg o 4i k:mye if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its original positm:fm7;7cdapx/ mu:l leux2 gxbf9 i)a4 nrw /0ion with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this result be altered?mxglaf )d/u mm x:7 w79euip an/c x0;rb24fl:

  An object can have zero v( h/kof :(bjumz lh76velocity and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at the rtz et*o5d+b 9same time.

  An elevator moving fv/mw28 95ot arg/xkn jnbj9(irom the second floor to the fifth floor making no stops along/59ng9 btw2mi nrojk(/ jaxv8 the way has zero acceleration all the time.

  A rolling ball moves)ho1 66cc snxagp8nr;yg u24fwh 4rp+nm ,x,s from $x_1=2.4 \mathrm{~cm}$ to $x_2=-8.0 \mathrm{~cm}$ during the time from $t_1=1.9 \mathrm{~s}$ to $t_2=5.5 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.9 \mathrm{~s}$ is at $x_1=2.7 \mathrm{~cm}$ and at $t_2=3.0 \mathrm{~s}$ is at $x_2=8.4 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight c) /bu3gd d*gjspe m00tomplete laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 7.1 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 strac1m4ku qe+5skfer,0a ight line, moving 92 m away in 9.,efck 504r1se+aukmq 2 s. It then turns abruptly 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 fr6;hijz.q d-yjs xy07m om $11 \; m/s$ to $23 \; m/s$ in 4.1 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 gu(*6 ;idj*dos/y h 1ab4rfj(mil4 yj$20 \; m/s$ to rest in a distance of 55 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a spee( 8clbbrll1jw- .7tf vd 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 to6* n2iuqoda0jp speed aboutd*nia620jqo u $11.3 \; m/s$ in the first 11.9 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*f2ju )//5r whn rtvlm a speed of $20 \; m/s$ to rest in 5.70 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 the highway. Assumingw- y ji*6o6 r cejjow)1hk9l.i a decelerati6wyk ej- woor6 9)*jl1h.ijcion of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck going cf 9 h.ze;(v:2vnsoha $25 \; m/s$ 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 therr;a x-;hmra9 39zhdl 10,000-m run in less than 30.0 min. After exactly 27.0 min, therr azh9mr-x ;9rdla h;3e are 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?    $s$