Suppose that an object travels fr*j0zeue9m bmpq or 581bwf,) jom one point in space to another. Make a comparison between the dispmue98zjw0*fpmjb r o) 5,q1e blacement and the distance traveled.

  When is the average velocity of an object equal to the inst ql6sn(zj99i santaneous velocity?

  A new car manufacturer advertisuj**6 ld 7- tvezo6nyles that their car can go "from zero to sixty in 8 s". lv7t nyou* d6*je-6zlThis is a description of

  An object moving in the +x axis experiences an accelkp 4rm6t dt-6seration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to sk ztvcg1jform . j36b-;:;vuelow down as it approaches a traffic light. Make a statement concerni1 v k jj oetu-v.gb;cz6rf:m3;ng its acceleration.

  Suppose that a car tr,wy/jy(shgi;vb lc. , aveling to the West (-x direction) begins to slow down as it approaches a(h/ sw lig,jb;yy.vc, traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make a sd+jkarf a;a4b cv,)grsb0;+q tatement concerning it+bg0)cqvba;jds r4a k,fr +a;s acceleration.

  If the velocity of an object is zero, does it meaneg;fs-)r ftz6iv; 4tm,tw. nv that the acceleration is zero? Support your answer withw z;fs; g -6vrnfme,it4 v)tt. an example.

  Can an object's velocity change direction when its,:aui34df)jjtl mohag so 312 acceleration is constant? Suppor2f 1)a:m ojtasu334hi,j oldgt your answer with an example.

  Suppose that an object is moving with constant acceler, -*niw xd/jrxation. Make a statement concerning its motion with respect to dx ,-x/irw *njtime.

  Can an object have increasing speed while its accelef ft-ih jtd-a4vg4n))i 2as 9lration is decreasing? Support your answer with an 4-atv f)g4a)-h2sitlndi jf 9 example.

  Suppose a can, after an initial kick, moves up along a ye* *n 32-dy79i slmmpbx1p9:wetpc f c6qp,csmooth hill of ice. Make a statement concerning its acceler,icb13cwytpmlne cespd*pmp*x:7-6 qf y29 9ation.

  Under what condition is average velocity equal to the 4l:1kz+bc rhulv yu).(f7ax q)+mqwvaverage of the object's initial and final c4wx 17rabhz lf)q) .+ kvl+ (mq:uuvyvelocity?

  Objects A and B both start at rest. -cx d6v(f 8ryn They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of objec6dx -r (nvcf8yt A compared to that of object B?

  Objects A and B both start from rest. They both accelerate at the same rat+ smk8trmpar:9om+ s-e. However, object A accelerates for twice the time as object B. What is the distance traveled by object A compared to ksa+o p+tm-m :9r rm8sthat of object B?

  When an object is released from rest and f lud4.pwj 5mk c.3; lx:hilz g90lxi-aalls in the absence of friction, which ilmw.gxu3 l -4ad5.zkx0l9j: hlc ;piof the following is true concerning its motion?

  When an object is released from rest an7gnpk piao2 6f/(+rv od falls in the absence of friction, which onv/+op i2kaporf76g( f the following is true concerning its motion?

  Suppose a ball is thrown straight up. Make ang,95cnb9kzzhs /j r 7 statement about the velocity and the acceleration when the ball reaches the highest point.z7ks,zbnjhn/ 9g c9 r5

  Suppose a ball is thrown straight up. What is its acceleration just befor.tf, ofx )wxs0en;y+ge it reaches its highest y;.f+gsxo, fx )te0nw point?

  Suppose a ball is thrown straight up, reaches a maximi5*n50 l lupv9iyq7ahum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is going up5 upqvnll9ah7y0 i* i5.

  A ball is thrown straight ix* 1gjx5j u.+ib.dv *by1mzx up, reaches a maximum height, then falls to its initial height. Make a +*vy.*x5 gj 1m ud bbixiz1xj.statement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence ofm)90dop+dtmom)m r2 l air resistance. Make a statement coo9odpl dr+)m0) 2mmtmncerning its acceleration.

  Suppose a skydiver jumps froy,a(mtnm; l0e*f fom+xpj 7f7m a high-flying plane. What is her acceleration when she she reaches terminal velocit7 xlma(7 yff+je;m,fot0 * pnmy?

  A ball is thrown vertically upward with a speed v. An identical secok7iiz5y dj:jq2* qel(nd ball is thrown upward with a speed 2v (twice as fast). What jkd5z : i(2*yiel7qjq 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 fro*a 5ubohv .qi5n.) nacm the top of a building. One second later, ball B is dropped from the same building. As time progresses, the distacn)o*na 5ba.i5qh uv.nce between them

  Ball A is dropped from+a+cccl2kf6 e the top of a building. One second later, ball B is dropped from the same building. As tim 6klcefc 2++cae progresses, the difference in their speeds

  Two objects are thrown from the y:v9vq9m ozte7,w ldq9fx92t top of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their s lf m9w99,xt7yv2oq9: dvztq epeeds when they hit the street?

  A brick is dropped from the top of a building. A second brick is thrown a6d w,ugntr;qchd+wh:mazkh3jp .h ;+* t,p 2straight down from the same building. They are released at the same time. Neglect air resistance.q;mtdpj3cut+,h d rhwz+g6 wh:,h* an a;k 2p. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +xur 879zdxi9d -z1km dl axis. The position versus time graph of 9uxd-1 rz7k8l d zi9dmthis object is

  An object is moving with const h v36emcj5ouf7.g9 mtant non-zero acceleration in the +x axis. The position versus time graph ojugho mt6v mef.973c5 f this object is

  An object is moving with constant non-zero velocityxc2kt,cf) yhdm ,1lq. myq o-ck1y5+q in the +x axis. The velocity versus time graph of tyq cm, .2tkqf1hyxc+ lky 1-c ,d5o)qmhis object is

  An object is moving with constant njwx277l p qsdqn,s91gon-zero acceleration in the +x axis. The velocity versus timed7 2x,qqls1jsp9 wg7n graph of this object is

  The slope of a position vejehwgtc w516bms6czb/1+op wd 7qy7 3rsus time graph gives

  The slope of a velocit5z w7wd- x*iixy versus time graph gives

  The area under a curve in an acceleration ver sxg hf5rw c4y4fom+)ki 3wkz:s2 q*t*sus time graph gives

  The area under a curve in a t : hdzuoo gz01e4-mme04ds1 c6qc) mbvelocity versus time graph gives

  If the position versus time graph of an object i, mvm o(kqdkvz8g3/k5 s a horizontal line, the object m8d3zq5mo /gvk kk(v ,is

  If the position versus time graph of an object is a ver: sfe4jtcp-) ztical line, the object is) jzf-te4p: cs

  If the velocity versus time graph of an object is a horiziu;ql.)0lxk yt6lh0lw jme0 8 ontal line, the object ixhji6l0 tq8e ; m.0ky0lw u)lls

  If the velocity versus time graph of an object is a straigb lzi(u 38oo8-6qezj*sh- oztht line making an angle zs8e(o8u*zq-o jzh6l3i o b-t of 30 degrees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both t5t93c bt-nk7 bq +madkhe distance traveled and the magnitude of the9na t -bkqk 3tmd+c5b7 displacement vector.

  A boat can move at 30 km/h in still water. How long will it take to m 9cltp(ue(r d,rk2o r 8p:jht u(;a9phove 12 km upstream in a river(d2,at9h9 u;hklr(t(c8op : epr ujrp flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609 m)d5tgp zuo 00+h

  What must be your average speed in order to trave-1ydh y*puxnp5mm4,fbn *; mel 350 km in 5.15 h?

  A runner ran the marathon (approximately + rumro+(ja096g fgn5uzo-+nj 9ut7ndpb ix 742.0 km) in 2 hours and 57 min. What is the averagr un(abn 9x-jj+o9 mdgn+go7itu u5p+ 06zrf7e speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to tsh j7,psrzu (/ravel 400 km?

  A ly (light year) is thw+ob/d0gv k -ve distance that light travels in one year. The speed of light / -vdbk ogw0+vis $3.00 \times 10^8 \; m/s$. 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 straigdzafj;p+u,4,dh oi h*5inq y)ht road and you look to the side for 4.0 s, how far do you qn u dj,+*4o)a,;dph5f iyihz travel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 10ek2sg 5,i+ 2*9cssr 0v0sbg (pb4v ojsdbpn:z0 s, your average i+0 pn*gpbsk :vg0zr o2 5cbd4essbv,9j2s( s velocity is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 kmu4q(4pg ry 7aj 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 avera y(ju7pr4ga4qge speed?

  A polar bear starts at the North Pole. It travels f )l,tv)m+kk p oudt-q: ps2r61.0 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 take ltksf2t,:+))qpp6 ouvd-mk rs 45 min. What was the bear's average velocity?

  You are driving home on a weekend from school at 55 ; *b/k xn5s/j7yt as62sbmwivmi/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 frow*/6jt/syxvas b bk2s57 mi ;nm school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. p2sb+*,h5e(c m 2yo 7du 3zwehkmv3hrWhat is the average sped23b km +m 2z3hs( e7ru*wce5hhyvp ,oed of the motorist for this trip?

  A motorist travels for 3.0 h at 8w6lj/ cx,(epd7ycrc4 0 km/h and 2.0 h at 100 km/h. What is her average speed for the t( cc x,e jr6y4dc/wl7prip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 25:41pf gp0d3q maypwm70 mi/h north for 750 miles. What is the avera0d:4p 1mg7pampyqf w3 ge speed for the trip?

  In a 400-m relay race the anchorman (the person wnsgck s:(5hxpkn:hg c*b-a++ z2)x ru ho runs the last 100 m) for team A can run 100 m in 9.8 s. His rival, the anchorman for team B, can cover 100 m in 10.1 s. What is the largest lead the team B runner can have when the team A runner skgaz2snn) bhccx* : -h:++(gs 5kurxptarts the final leg of the race, in order that the team A runner not lose the race?

  A car decelerates unifoo e*tc:jxeqcz* yqt4-;hs,t) rmly and comes to a stop after 14 s. The car's average velotqc*eh)x4o ;e tsjyt,z*q -:ccity during deceleration was 55 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s84 xt(sbefao m5h1p v y zzd0lg2sh*), to 160 m/s, at the average rate of o(zsyvh1tfblzsmg 0x8, 4ea*5h 2p d )$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h ac3;ukjjk0old,f q j:)m43gso bcelerates at 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 apc*:z :w z6anat $4.0 \; m/s^2$ 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 speer8j iyqhg is/ /es04m)ds up with a constant acceleration of e0j8 m)ys//hq4 iis gr$2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 2.3 m/s experiences a co3l9a tp 9ckvd:nstant acceleration ov al:ptd c3k99f $4.7 \; m/s^2$. What is the cart's displacement during the first 4.9 s of its motion?

  A bullet moving horizontsa8 x+.mch;ypally to the right (+x direction) with a speed of 558 m/s strikes a sandbag and penetrat;amychs. x8+pes a distance of 40.38 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane i: v nlv04cn)-vs pr3ycs launched from a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleral-:svncv ) 0npvc43yrtion is constant, what is the length of the catapult?

  A car starting from rest mo s.rwy,a07uv8jhsut* l x40ejves 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 aknfdb+t.t(a 7 verage acc t +(fnbk7da.teleration?

  An object starts from rest and unde*xeyc/i+ b;pgesc tdc5j3i8 8 rgoes uniform acceleration. During the first second it travels 8.6 m. How far w3djtx85e/ 8gpc bic+isc;ey *ill it travel during the third second?

  An object is moving in a straight line with constant acceleration. Init9dyhocfq(hb 7a.07jh2tr gc( ially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this time?2a0.ct7(hjhr9hq bgd y(f7o c

  A car starts from rest and accelerates uniformlcp mhd+ z51n+nox+j.yy 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+mp -7 ; cap:n8z/: ascwtnhyruwq.s( about $5.0 \; m/s^2$ when braking. Suppose a car is initially traveling at 55 mi/h.
(a.) How much time does it take the car to stop?    $s$ (only input numerical values)
(b.) What is the stopping distance?    $m$ ((only input numerical values)

  At the instant a traffic light turns green, a car v duyh:3 n/* jql.mkb:u ,ha-pthat has been waiting at the intersection starts ahead with a constant acceleratioy:,h um*vhl k qd3-.p nja:/bun 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.2yn51 mcscz f a speed of 12 m/s on the surface of planet X where the acceleration due to gravity zf1 .ns 2y5ccmis $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown u,j qd- dk5h.cfpward with a speed of 12 m/s on the surface of planet X where thekhd5.fc -q,j d acceleration 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 on the surbrde jj64)6h4 ,0/b ljlhh wyrface of planet X where the acceleration)4l6djblbe, j6r4y/0hrw h jh 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 ok0uf; o9e. hqpf 14 m/s on the surface of planet X where the acceleration due 9;k upe0h.o qfto 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 friend holds a.yaxj4rt7 nr 8 ruler between yo xa.nty7r8r4jur fingers and releases 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 fb wsp6 ::r5qcron(r9 m/s. What is its velocity after 3.00 cr5s:r:nwfpo9 ( r6qbs?

  A bullet shot straight up returns to its starting point in 14 rr k* 13r2pc0a.ijhkh s. What is the initial hkrc a32.0j k 1*phirrspeed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/szf,w/( +vk+* yzfl azo. How long does it take to return to its zaof+vw/fy*zl,(zk+ starting point?

  A ball is thrown downward from the top of a building with anrmp:st4 (do z 9t//*-qu;qwll /unyep initial speed of 9 m/s. It strikes the ground after 7.1 s. How high is the buildinq -/ opu r9leulypd/( w;ts:nmz*q/t4g?

  A ball is thrown straight up with a speed of 30 m/s.u6)1hv rjfq dvuw): i3 (only fill in numerical valurf3wq jh)d 1iv:u)vu6e 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 wm5hq9pjj e z56ith a speed of 40.6 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 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 is the velo. i ,xdjt7 :bvu hg-*o6vvdr4ocity at t = 1.0 s?

  In Fig. below, what ildfeqdfxm0,c,52: bxqy ap9 g )u/m:os the velocity at t = 2.5 s?

  In Fig. below, what i -lort mx /w*auy)1bpl3xghjl-+ p 48os the velocity at t = 4.0 s?

  In Fig. below, what ihb o bj/y)wws dtd2 2hj34a-5bja v2l5s the velocity at t = 5.5 s?

  In Fig. below, what is the average velocity from 0l+: 42+ha uggh 8ikjgp to 4.0 s?

  In Fig. below, what is the averascj o)ir// eq)rmt7f) ge velocity from 0 to 6.0 s?

  In Fig. below, what is ths9 f*cz, pqtl*;vamq 2e acceleration at 1.0 s?

  In Fig. below, what is the acceyfa) ct o.njwpz-6u62leration at 3.0 s?

  In Fig. below, what is the average accelel:xf zxb -p- pppv4o b6+up*a1ration from 0 to 5.0 s?

  In Fig. below, what is thedvhi7s3*d k( x average acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement l lfgsm;4w-+bfrom 0 to 8.0 s?

Does a car speedometer measure sp9dit2,.jmw 0ug6lc dn ,xdw c*eed, velocity? {speed|velocity}

  An object can have a varying speed if i 7c)3rpzv jer:ts velocity is constant.

  The velocity of an object can be negative when i/f. )rtxhm)nvs g ol -vm07r0qts acceleration is positive.

  If one object has a greater speed than a second-qs6lz-+ v+y-qcmtz3 lx,kfu , tw n(k object, the first must have a greater zns-l +,-(kqxy3,tu mlw+t zvkq 6-cf acceleration.

  Two cars emerge side by side from a tunnelv): r:n0us dfx. 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 incrq4 86ioyd:d( /1v4m8 jly+vqv bvbjzveasing in speed as its acceleration decreases.

  A baseball player hits a foul 9a c/z 74puj5mpgrez (ball straight up into the air. It leaves the bat with a speed5(4r7/ezp a9j zupcmg 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,7-(y3 (8(p8ier qfafs rj kmaq what is happening to its acceleration, how does it change if air frica jqkf8i-8ypa(fr( ( m3esqr7 tion is ignored?

  As a freely falling object sg)fcl(6m4x fbp, b* cypeeds up, what is happening to its acceleration, how doesgp,bc) (yxfb4f* 6cl m it change if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its originala6.cm3 w. 6h )w (ojb/cgytmjl position withb( ./ycolwt 6gc.mm 6jaj3)wh the 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 and nonze f,f*si,bpxlj*c pn/*ro acceleration at the same time.

  An object can have nonzerorngzo.hf g-09 lz/ xh-c*8y vc velocity and zero acceleration at the same time.

  An elevator moving fro;0q kabef c4m4m the second floor to the fifth floor making no stops along the way ha 4 bqe4;macfk0s zero acceleration all the time.

  A rolling ball moves f y4s ,tojt0(kmz ;+cozrom $x_1=3.3 \mathrm{~cm}$ to $x_2=-8.5 \mathrm{~cm}$ during the time from $t_1=2.7 \mathrm{~s}$ to $t_2=5.9 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.5 \mathrm{~s}$ is at $x_1=2.9 \mathrm{~cm}$ and at $t_2=4.4 \mathrm{~s}$ is at $x_2=7.9 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete la ja47bw8 8shkbps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 12.0 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, ujhw 7(p9e hzo*t02kvmoving 99 m away in 13.0 s. It then turns abruptly and gallops halou(h2pk7 etz09vjhw* fway 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 fr(dd3dg m(1picom $12 \; m/s$ 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 q*otw k 97-pwa$21 \; m/s$ to rest in a distance of 73 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speem6 t+.vg jgo xn6ccufd8/yp.4d of $32 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.7 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks t*8vg,(p,v8 22x-neujuzr akfj( ;gr zj3mfvd o essentially top speed abou-8 2fnjxru v82g zdv*j(peujm( ,,kz3rgf; va t $11.5 \; m/s$ in the first 11.1 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 fzad z5eb3dl2o k u)7z1rom a speed of $18 \; m/s$ to rest in 5.93 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 m 6d9.y.t6 -x)eupzmr x(iethi long on the highway. Assuming a deceleration6 d)xtmyeixuh.(e.z6- irpt9 of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a tru9p ao)lrinmh n,9zg) 7ck 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. Afhm+5yyteh))kc;so (v d bs41 uter exactly 27.0 min, t+s1eb;5ytd4umv()ch y sh)ok here 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?    $s$