Suppose that an object travels frg-3zo9lg-y5:v yi52w co jdwgym* 7zvom one point in space to another. Make a comparison between the displacement and theoyzmo5j:79*d 3g ggvyzi ww-vl5c-2y distance traveled.

  When is the average velocity of an object equal tba7o) h -ey;y8hc6nx- l s -p.pumwm9po the instantaneous velocity?

  A new car manufacturer advertises that their car can g56*/ kwc88zg cl,upxqtmmg(gfr q-w 2o "from zero to sixty in 8 s". This is a description of8g lwrm zq8p*umqwf5(gcg6 x -k, c/2t

  An object moving in the +x axis t 4 o(rszxth3e)j)2-m,b kli qexperiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling 0qt j,r5es xmas.:.ye(e/fflto the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement coq (rsf/. jaxe.e5:t mfys0el,ncerning its acceleration.

  Suppose that a car traveling to the West (-x bi e nqi*+n4f.rw e:2adirection) begins to slow down as it approaches a traffic light. Make a statement conceenqiw e4:brfna.+i 2* rning its acceleration.

  Suppose that an object is moving with a constant velocity. Make a statement 8 qz+sn3u0pji4fs2tnconcei8s u20t nz4nfsqp+ j3rning its acceleration.

  If the velocity of an object is zero, does it mean that the acceleration is l:jd lji e-1ef- 3s cujvf36b)zero? Suplu:j)6 -3l -jcejifbfv de3s1port your answer with an example.

  Can an object's velocity change direction when its acceleration is const, .t+r wsj1d9a/clf*2rcbdatant? Support your anlwja tc9s*,ctd a/2f.rr db+1 swer with an example.

  Suppose that an objehdik1b-afe) 8h a0 d*jct is moving with constant acceleration. Make a statement concerning its motionha de)80-k 1d*bja ifh with respect to time.

  Can an object have inw ati .aidm 26(db,nz-creasing speed while its acceleration is decreasing? Support your ans id nad,-a2z wim6b.(twer with an example.

  Suppose a can, after an initial kick, moves up along a smooth hi qyydc/0h ym,ehb(/4 ,;o(d8wtf lsrfll of ice. Make a statement concerning its accelera q,e fy(yh/ldsb4 r ho;w8d ymtf/0c(,tion.

  Under what condition is average velocity equal ttr)6oo q5n li3o the average of the object's initni q)t3 65olorial and final velocity?

  Objects A and B both start at rest. They both accelerate at the same rate.21p5tw lz2ik wmvfp-zwj4 11m However, object A accelerates for t kj1t-mzppwv wwz 1f2m154 il2wice the time as object B. What is the final speed of object A compared to that of object B?

  Objects A and B both start from rest. They both accelerate8b;+o e bv zip*yw4l,y at the same rate. However, object A accelerates for twice the time as object Bvy ze *y+ 8pw;4bi,obl. What is the distance traveled by object A compared to that of object B?

  When an object is released from rest and falls in the absence vtc4zqs3+1b xvn 95mvc 4d az,of friction, which of the following is true concetvbd cm 3,x1z+44nzvscva5q9 rning its motion?

  When an object is released from rest and falls in the absence of friction, whi zu(puw:9n lx5ch of the followi5lw9(pnu :uz xng is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about thp q *gv1yi42erv.8lqr6*k qjgt ,tw(k5r oh u:e velocity and the acceleration when the ball reaches the highest potrq*6 5wvi *v2(h t:pqr4 ujog .krqyge8k l,1int.

  Suppose a ball is thrown straight up. What is its acce8t:k+nw j**uu6f xrfmq, loql3ln 0.j y u1hv+leration just before it re.v:*ront+x3nw uju 6y,+1hlf l*q q80jkfmu laches its highest point?

  Suppose a ball is thrown straight up, reaches a maximum height, then falls to+hhrm :5qw2 v1gbklk-uvh3g( e7 : fpo its initial height. Make a statement about the direction of the velocity and acceleration as the ball is going 5-gw(fluk:q+k b h7ghrm2 : 13ev ovphup.

  A ball is thrown straight up, rjh ; kli j:yd1h)*ydt6eaches a maximum height, then falls to its initial h*dj;ykt)lhd ij 6:1h yeight. Make a statement 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 stateiawb l/i954i (l( gjg(a eyc-fment concerning labg-ic( (wai4 efi g(9/lj5yits acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her aco4oolqu 9rp +p9z:zhsb: 6e ( .bxmd+wceleration when she she reaches terminal :h ud(spb:.9p+o +wzqr emoxzb4lo6 9 velocity?

  A ball is thrown vertically5.n,qff( g gj*)z g (y33x,umchrfll f 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 lfn q, (gg3frgu)j fm*zy.3h(5clfx,ball to that of the first ball? (How many times higher does the second ball go than the first ball?)

  Ball A is dropped fror ts5q+f)2k x3,ancuam the top of a building. One second later, ball B is dropped from the same building. As time progresses, the distanc+ xqs3cfkara5n)2ut, e between them

  Ball A is dropped from the top of a building. One second laterligw97 ;u9d- j wbxrv vgpd7xw*++g. j, ball B is dropped from the same building. As time progr7jwgxbw vju+;7 w 9xdv+*gi9 .g dpl-resses, the difference in their speeds

  Two objects are throw9f q/ye 2ie9t4nor azw zl;l7:n from the top of a tall building. One is thrown up, and the other is tfaet 2iw9n/zye; l rl:94o7qzhrown down, both with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick is thrown str 007eu lih:1snajavnd3d ;ez87t(ehq aight down from the same building. They are released at the same time; 8sialhqzee0dud7 1vatj e(n70:nh3. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-r4qf(j .0 unzozero velocity in the +x axis. The position vers4z(0 u. jrfqonus time graph of this object is

  An object is moving with constant non-zero acceleration in the .lsvmpg ;m. 2i+x axis. The position versus g; .mvp.s2lmi time graph of this object is

  An object is moving with constant non-zero velocity in the +x axis. The uon04 tpy.8p ovelocity versus timeot oy8n0.4 pup graph of this object is

  An object is moving with const tb wvy-zaea4jjy6+6/hyf j /,ant non-zero acceleration in the +x axis. The velocity v-6jt4fyy6a/ +a/b wjz,jeyhversus time graph of this object is

  The slope of a position chx3 v7xb8zxrz7 i t1;versus time graph gives

  The slope of a velocity versus time graph givg 0hth/6 t,autes

  The area under a curve in an acceleration versus time graph g t:6y7sw y+ hw87uuvbfives

  The area under a curve in a velocitysh u6t 6rm.vz:4luv:c versus time graph gives

  If the position versus time graph of an object is a horizontal line, the o, qncwg*7i,msbject *is,gw7 qc,mnis

  If the position vers ,2qc3rq0 -wbajs0 qxcm2+5*nrw z dlaus time graph of an object is a vertical line, the object is5wqqmqraa2c0rwzc+j db0s - 3x,l2* n

  If the velocity versus time graph of an object is a horizontal l0)9mll. xvz two)(unv ;e)nweine, the object ul ;o. xw)e) )vtn( v0wnlmz9eis

  If the velocity versus time graph of an object is a straight line making antk4,6hiatjla tn 3.w 3 anglijtl3a,64.wt n3k at he 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 the distance)8ndvv y p qskavsjm1 q4b;2d-7e:,mw traveled ;y v)dj2qm:v n,-1mwsa7vek 48sbqpdand the magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long will it take unv9 y + woej);ra,5qpto move 12 km upstreaq)nroayp; 95 uve,+j wm in a river flowing 6.0 km/h?

  55 mi/h is how many m/s?9b7jzu k 8m,zv (1 mi = 1609 m)

  What must be your average speed in ord+a(6u-goiml i er to travel 350 km in 5.15 h?

  A runner ran the marathon (appro 2xkiwgi x-,vqdsd;4 3ximately 42.0 km) in 2 hours and 57 min. What is the average speed of the runner in m/ssi3; i4dx, g-w 2kvxdq?

  A car travels 90 km/h. How long does it takef/0p*em 7xhk ,r m;ygt for it to travel 400 km?

  A ly (light year) is the distance that light travels in one year. The s mrffi: ,a2og;rf ,o 5+jswza)peed of isr,wf2oa;:zr, ff )+5 ag ojmlight 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 straight road and you look (;9isq)- ru;xtg:w)h5ylmt uw0vfiw;z sc y*to the side for 4.0 s, how far do you travel durinw g-tfs *mt)i5ruc)l( i z9;u:vsqywx0;;wh y g this inattentive period?

  If you run a complete loo)ama12m 5i:4 djn/ jrh gx.ecb- nu/ptp around an outdoor track (400 m), in 100 s, your average velo) nrdjg/c 5a:p4tmn.1 2/xmajie bhu-city is

  A polar bear starts at the North Pole. It travels 1.0 km south, then92m6cctc ekv :zfat17 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bear's average speccv 716tm2k:eat9z fced?

  A polar bear starts at the North Pole.b 9a4qv xq.9re It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the reqb49vqa.x9 bear's average velocity?

  You are driving home on a weekend from school at 55 mi/h for 110u;yt)kr4 qkjb0 6 vy+a miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How f v4ujyk)6;ratk0+yb q ar is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 k-,mzn z.c7m yrm/h. What is the average speed of the motor,yc mzn-zmr.7ist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her xeur1-3ypbx dr/t j i218y+ksaverage speed 1 xxr/bus-j yr1tk3p 2d8+eiyfor the trip?

  An airplane travels at 300 mi/h south foro) knl0l 8zt0r 2.00 h and then at 250 mi/h north for 750 miles. What is the average speed for the z)no0lt0 krl8trip?

  In a 400-m relay race the anchorman (the persw. 2z2g ;j+m j mr (nv1g6bahxp.apsd:on who runs the last 100 m) for team A can run 100 m in 9.8 s. His rival, the anchorman for tea .:ab 1xrvh+wj(pm;2 dsgz.6 2apjmng m 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 stop afabc..kx bxp47x i r9rx*1*pyvd2lpm3l/t +tlter 12 s. The car's average v.xx2ll3 7 lc yktrib1+axp*.9r/tp4x mvbp*d elocity during deceleration was 51 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed frt/ v50yp2nuriom 100 m/s to 160 m/s, at the average rate of /ypiu 2t05rnv$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at ty/wkagmaa127:7 rvc o5ptt z;he 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 accelert8+ky 9ma j)ufates 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 constant accelcw3o1 v /h+wgferation of+c w/g h1fowv3 $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 5.8 mo1 cl;*ny(nrb 9z:p sj/s experiences a constant acceleration of ysbn:rnj co lz1* ;(p9$2.1 \; m/s^2$. What is the cart's displacement during the first 8.6 s of its motion?

  A bullet moving horizontally to the rig.+*9ie taufqqs 0 ysw.ht (+x direction) with a speed of 435 m/s strikes a sandbag and penetrates a distance of 16.13 cm. What is the average accel+afq.0ssy9. i*q uwteeration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an+ ilvce 7ktg*)m/s d:*fzoq5d 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 length of the catapulgs +d**:oq/ c)ftl kzem 5id7vt?

  A car starting from rest moves with constant 5ytrg 6tt8(yp4 .tb gbacceleration 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 20067wp gcq x +5zagxp4g0cml/-wa()hx j m. What is its average acc) c pg5ga-gjx wz6lhp0/+4xaw 7cq xm(eleration?

  An object starts from rest and undergoeh:y-rp +bdkoufh 6h866fd-dms uniform acceleration. During the first second it travels 7.2 m. How far w8khbfdp:+ hyhd6ur ofm6- d6-ill it travel during the third second?

  An object is moving in a straight line with constant acceleratio u05nkp q2p/ xw 0lrtprh4dnobwt55.-n. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during th0dup.r5pw502k/4oxt tblq w r -hnnp5is time?

  A car starts from rest and accelerates * m x/-qwst5dbuniformly 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 ro:;)b ffswt. oiad 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 light turns green, a car that has been wa-zwm15)ah v9s6k f3 f6h pdwcgiting at the intersection starts ahead wik s6-6h 5capf ww13f h9dmvgz)th 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/)*rgcp7hmm cf9. vx :rs on the surface of planet X where the acceler pc. )mv:9m7hcrrx*g fation 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 surfac/;rha mt,s7o ve of planet X where the acceleration7 vhto/;smr,a 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 se1y zz3md/ersdf,+79mhk b4 c urface of planet X where the acceleratibm ye3 1/r49z,s7kfzcd h d+emon 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 on the surkz2 c*:1f0) iccq aeqvface of planet X where the acceleration due to gravity:f*ca1qikz0 q2c)vc e is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greater th +lzq8 dq ewof9nnp3/;an 0.10 s. If your friend holds a ruler between your fingers and releases it without warningnd9w p+l q;/ n8oq3zef, 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 velocity ayy-xbq2 u;, ek-otex /fter 3.00 -,e 2q-/bt okyuex x;ys?

  A bullet shot straight up returns to its starting point in 14 s. What is the i2 ;wb2nte4 zo0sozrr8ni 208s oznrebotrw2z; 4tial speed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does :skd/metm( +o it take toem(mt+ k :s/od return to its starting point?

  A ball is thrown downward from the top of a building with an inimtobnn127gmk kz 5 b39tial speed of 17 m/s. It strikes the ground after 1.2 s. How high is t 2mk n tbgn1o5m739bzkhe building?

  A ball is thrown straight up with a skphbusqdu5v0q7ow*s f kw*-+ x -d1l3peed of 30 m/s. (only fill in numerical value in the blanks)h k upw*7*0ubl1fs vq -+skdx w3-qo5d
(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 6nap9+fm g od.into the air with a speed of 21.5 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 3 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 5 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 5.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity ato bm4jhjb/k4 :qtd; q8ktk 3*s t = 1.0 s?

  In Fig. below, what is the velocity at t = 2.5 sae( z2py97 vg7t 9ff2voa3gyx?

  In Fig. below, what i yf43 b3 xeyr)a/*/ncmi 5quzws the velocity at t = 4.0 s?

  In Fig. below, what is the velocity a.yh3j 3 n6ijzat t = 5.5 s?

  In Fig. below, what is the average velocity from 0izt9h l epy-qth2:,rf7qd(n9 ijd /. u to 4.0 s?

  In Fig. below, what is the aveukn zrc*)c:1e/ f/skzrage velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration at6x . j l,ngy(vw9*mgnmp)y ic( 1.0 s?

  In Fig. below, what igakz22 -pu1r/jhd ,lgs the acceleration at 3.0 s?

  In Fig. below, what y 0m3ftko:pt299 nkznis the average acceleration from 0 to 5.0 s?

  In Fig. below, what z2l ;7l ddcaq.is the average acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 .fdo e(y0we 0*gz8l) oxw*vug to 8.0 s?

Does a car speedometer measure speed, velocity:b+ogzb,1h my? {speed|velocity}

  An object can have a varying s/*xxvm7i jc6v* gk(iw peed if its velocity is constant.

  The velocity of an object can be nn(hmbm f7.j -3-gmzdregative when its acceleration is positive.

  If one object has a greater speed than .urjq knfwmp4*+3ba 6 a second object, the first must have a grear4q uam.fk63bwp+ j*nter acceleration.

  Two cars emerge side by side from a tunnel. Car A is traveling with a s;r aso,nvib8 +peed 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 awnma+7cn.d0 s cceleration decreases.

  A baseball player hits a foul ball straight ub/ev) wqr+or+9: figop into the air. It leaves the bat with a/e:qwrfo o i+b+r)g9v 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 object speeds up, what is happening to its 9g2uisf, b2o tpfac89 acceleration, how does it change if air friction is ignored?tuig 8c ,fa9pof9 2s2b

  As a freely falling object speeds up, what is happening to its a;c ijwb;sa.z ,u4*vkrcceleration, how does it change if air friction CAN i;*wucvr;zk sb aj .4,NOT be ignored?

  An object that is thrown vertically upward will return to its orig8si 7w 7ablu 9zupmml73p+0 jminal position with the same sp u sll9bm3j0u+m7ppi87waz7m eed 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 velocitfznn -l24wel ;y and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at the same tis,v+ (e(z,va j2qq/4xb gssjo me.

  An elevator moving from the second 54:l1(srbtl, osh pukfh:f (bfloor to the fifth floor making no stops along the way has zero acceleration all the tim:f4,bstrhlokpub 1 s5( hf( l:e.

  A rolling ball moves from *.+)ztg:n vk;f nvkg q$x_1=1.7 \mathrm{~cm}$ to $x_2=-6.5 \mathrm{~cm}$ during the time from $t_1=1.7 \mathrm{~s}$ to $t_2=6.0 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.6 \mathrm{~s}$ is at $x_1=3.0 \mathrm{~cm}$ and at $t_2=4.3 \mathrm{~s}$ is at $x_2=7.5 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps a .-t7ne;yy:tsyen(2w o7 uicvround a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.6 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 1 r;f7z roia,48 g tqxx5o;oyxa straight line, moving 113 m away in 9.5 s. It then turns abruptlyq8o zix1xtoyxga;74r 5;,of r 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 froud9qz8p rsb*2j t.1jc m $11 \; m/s$ to $24 \; m/s$ in 5.8 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 u.*t3gvvs b ag9e b*2e$16 \; m/s$ to rest in a distance of 78 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach ukply4-fg .r5a speed of $27 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.2 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter( y9u)2x z .8jli4d.k5gk8tqlit rwtc can burst out of the blocks to essentially top speed about.8 kjt(wtk d.gi) c9irxll qz2ytu 548 $10.9 \; m/s$ in the first 10.4 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 kfplf u)c3 ) m7i)5mdmfrom a speed of $17 \; m/s$ to rest in 5.94 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves/kh0 b)kwvl :x skid marks 92 m long on the highway. Assuming a decelerbv kwl/kh:)0x ation of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck q msh a-v*bk9hy il;6+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 compl+a/nkk 2nwn cq//i/xbete the 10,000-m run in less than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner must then acce/xin2n /b //nqka ck+wlerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$