Suppose that an object travels from one point in space to another. ,de8vr9xn3 ycxt + ,veMake a comparison between the displ,3v e9rxn ,y8+xcv tdeacement and the distance traveled.

  When is the average velocity of an object equal to the ikhit *v 2)gd 2i8dgl3zd6dvk-nstantaneous velocity?

  A new car manufacturer advertises that thexq96shjy 8fo;p rbw( )ir car can go "from zero to sixty in 8 s". r jp q8 9;6bhfys(o)wxThis is a description of

  An object moving in the +x ax1zt + expa8sqed-su 3gp)9: )/hnqwteis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the Easthnt+c95m ediyr- ( w-b (+x direction) begins to slow down as it approaches a traffic light. Make a statement concernhmd(y - bncer -i5+w9ting its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to sl/qw st b q,.c0eaef4gmse-pq8n, 44hjow down as it approaches a s 4 mpq gfb,0/4qsqe.,-8etwcaejnh 4traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Mak -)n6y qdqfp2e7 oxy2le a statement concern-x yf7ly6n peq2doq)2ing its acceleration.

  If the velocity of an object is zero, oez0w 5jt:e ll.m hjo:;*nsk4does it mean that the acceleration is zero? Support your answer with an exam:.4 sj o05*heto; ewm :nzjllkple.

  Can an object's velocity change direction n ,+fl-fuv3,w f1ad zowhen its acceleration is constant? Support your answer with an e1wznd,fvfolf3- ,+au xample.

  Suppose that an object is moving with constant accel9kl.wmno4 w n7eration. Make a statement co. ow79mnn lk4wncerning its motion with respect to time.

  Can an object have increasing speed while its acceleration is decreasing? Su/kwsq 84ni+yng-j i5r pport-sq8 iy+ /kijngrnw45 your answer with an example.

  Suppose a can, after an initial kick,l62texyyux7/rv kl 0) 0i t5nh moves up along a smooth hill of ice. Make a trnvi0 5/h6u)lt0yx2yex l 7kstatement concerning its acceleration.

  Under what condition is average ve12:.2gbcmw.* n oaw9o oyjp6 rmp8qgwlocity equal to the average of the object's initial yo.ngmg bpwo*jwca9.r 68p w12:qmo2and final velocity?

  Objects A and B both start at rest. They both acvcv kgntmo9w g5;8k;+ celerate at the same rate. Howe;k n; gcmo8vt9+ g5kvwver, object A accelerates for twice 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 accelerate at the same rzl)4j hn ym d/kqshjq,030k: sate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A compared to that of objecthqkn: y zq3jd s)s4jhl mk00/, B?

  When an object is released from xum w0o87dc+i rest and falls in the absence of friction, which of the following i7xiumo w 8dc0+s true concerning its motion?

  When an object is released from rest and falls in the absence o,ggdq3vzv3.jtw, z (qf friction, which of the following is true concerning its mdt gz.vj, q(wgzqv3,3otion?

  Suppose a ball is throw ntc)yf ) *e2c ;zz9ec.krus;jn straight up. Make a statement about the velocity and the acceleration when the ball reaches the highes e*kcsf.ucjy;nr 2 9 ez)t)zc;t point.

  Suppose a ball is thrown straigh;qa*,(jlrf5us+a swrvos0i7 t up. What is its acceleration just before it reaches its highest point?u(*rri ,s5a+fv sjs ;aw7loq0

  Suppose a ball is thr xgzqrx f,oau9-f,q8i+ ,de f)own straight up, reaches a maximum height, then falls to its in,qf,if x)g8qufz9- a o+xe,dritial height. 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 maximum height, then falls to its evo ww6-5jnc4 initial height. Make a statement about the direcvw6 ce5wo jn4-tion of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resist7s8,qf r4y+ i nqkiuz9ance. Make a statement concerning its acceleration.94r q 7uny +,izikf8sq

  Suppose a skydiver jumps from a high-flying plane. What is her acceleration whey6hy2 mxe,3 1 milyqd9n she she reaches q1 iyd36,mmyl92x eyh terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical2-ixa hv4dk r,q* b7xq second ball is thrown upward with a speed 2v (twice as fast). What ri4-h7vax*kq2dq,xbis the ratio of the maximum height of the second ball to that of the first ball? (How many times higher does the second ball go than the first ball?)

  Ball A is dropped from the top of a building.n(fn1gqpdu 9hw 8: m9xb+b-qe-ne f;u One second later, ball B is dropped from the sa + mwx(hu-qf89 :e;b u-egnf19dnnp bqme building. As time progresses, the distance between them

  Ball A is dropped from the top of a28nze7qkhk 5c building. One second later, ball B is dropped fr5z ck8nh2ekq7 om the same building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One isotycu)87l f, c thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit th8 ,7ulfcto) yce street?

  A brick is dropped from the top of a building. Aj/ ic,ta9i,j1dh o b6;;h1ni kmozj:c second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the acceler/k1;b,t c;c9,mji jodhi zin6 :h1joaations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. The dpu y.x-lptmjl9l-10mr bw;9 position versus time graph of thisu. l1;td9p 9jbllxm mp -rw-y0 object is

  An object is moving with cons5s,3gcisb6;:qdj 5gg;co7 ncc* wl0 a.gpv eytant non-zero acceleration in the +x axis. The position versus time graph of t5ls7s 3g.a;e cb5g p;qn6jocgg,*yi vd 0:cc whis object is

  An object is moving with constant non-zero velocity in the +x axis. The6.qce* xa,:w)y lcz :u/ itqqf velocity versus ti 6/c: ,qezuciftaqql:. *x)wyme graph of this object is

  An object is moving with constant non-zero acceleratiowe*4+dgx 4 snfccz3pl0,/b xx n in the +x axis. The velocity versus time ggw e3b/+* , 4z4nlcdx pcxfxs0raph of this object is

  The slope of a position versus timrk bu.s 7,wtg o;(ge+fe graph gives

  The slope of a velocds0 ru1satw.9ity versus time graph gives

  The area under a curve in sm8; te3m czqnmj: m -:1jr,yzan acceleration versus time graph gives

  The area under a curve in a velocity versus time graph / txk u:/7ghb,g t1.k sz7wdqzgives

  If the position versus time graph of an object is a horizontal 88 iib)enne hf n;k6hjmvy;j2 -:*hqug)+ne cline, the object iehn;n8vk)un;cejh hbi8)- f +n j:2*yiqg6m es

  If the position versus time graph of an object is a vertical line, the noa a(l hiqury7 ;8q:cq1 o* 8nt6c*yhobject isiq7cq86uhtco:n8yy(r o*an h l *qa1;

  If the velocity versus time graph of an object is a hori9i 3kr. )dh(ihy9leo )rh 6tngzontal line, the object er 9h)oy. )h(trkidh3iln6g9 is

  If the velocity versus time graph of an object is a s8x) n;ngh9.w)j et,aaysnp xi tw4(ffoa s0 *-traight line making an angle otgnw f()ps4f h09,s ni w)xy*a8oj;.a-x eatnf 30 degrees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both thezdwvc5; q4 tm e-34 lams5im)a distance traveled and the magnitude of the dvw ceim4t 3d;5)aqmlm-s45a z isplacement vector.

  A boat can move at 30 km/h in still water. Hdb j;q2ue7;.dukrlh372 *aggr pd/y t ow long will it take to move 12 km upstream in a river flowing 6.0 km/hg .;a 3dulphb u7dt/2djrg7;2 q*kyr e?

  55 mi/h is how many moiw3q77 m k,/e8vwug)qrus ,b/s? (1 mi = 1609 m)

  What must be your average speed in order to travel 350 l/ac hgdn0(( pkm in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) ihf/u tb*;u /i:o/kcrdu5em) gn 2 hours and 57 min. What is the average speed of the runnebh * ucr:m/uk/o;g/ui tfd)e5 r in m/s?

  A car travels 90 km/h. How long b6fhwh7sgl:a v +5t-a 9qnbb9does it take for it to travel 400 km?

  A ly (light year) is the distni-1nl2vko :s ance that light travels in one year. The speed of ligh2k1o- lnvsi:nt 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 to th9q-7(x:ah8lfrtqs exp ( f xj6e side for 4.0 s, how far do you trav8fq7r:lqtf9xahp jx6s (e( x -el during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100v9oj p4thgc2 0 s, your average veloci4 g9jh2top vc0ty is

  A polar bear starts at the North Pole. I,amxvt 8j6xw7t 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 mi8x6,jx mtv7w an. What was the bear's average speed?

  A polar bear starts at the North Pole. It travels 1.0 km south, th7mm i i6t;oz6rry 6as+en 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 msrizmy mi+6o7r 6 ta6;in. What was the bear's average velocity?

  You are driving home on a wvb: we-jrts;) wb,6pf8,e mww eekend from school 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 school? v8m-,s;pjwewtbb6), wrf ew:

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What e jy+lmxt jq)c9 ( kp.10c,tqsis the average speed of the motorist for tsm0 ckt)q+x ye(cqj ,. 1jtp9lhis trip?

  A motorist travels for 3.0 h at 80 kmk/o)6 uavr* nh/h and 2.0 h at 100 km/h. What is her average sp h*rnku)/avo6 eed for the trip?

  An airplane travels t beex3+0;s okm2t0s dat 300 mi/h south for 2.00 h and then at 250 mi/h north for 750 mild 3stxko0s;2e +m0t bees. What is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the lasm . +u7q*jqle3*qtseh t 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 +qleq *.jh7 m*eu 3tsqs. 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 stoqqfzp5j1r4+m g/+ lu op after 12 s. The car's average velocity during deceleration was 37 km/h. What was the car's deceleration while sz++/ qf up1rq4mlo j5glowing down?

  An airplane increases its speed k xbd942 )znzx70 euu;8jigxa from 100 m/s to 160 m/s, at the average rate of e ia d2xzxngxz0uu 8 4j;9k7b)$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h acceler ug)nxh(3fpz *ates 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 at+bau-jektcfwx r54vj;g h) : 4 $4.0 \; m/s^2$ 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 jmdl724z rzresj -m+4 a constant acceleratio-rr7zd+4mjez l2mjs 4n of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velochke gu9 i1s;w+ity of 6.8 m/s experiences a constant acceleration ofgsw19e+;ki uh $3.7 \; m/s^2$. What is the cart's displacement during the first 9.9 s of its motion?

  A bullet moving horizontally to the right (+x directio wscx1s:ym j,-c.qwx9 n) with a speed of 437 m/s strikcmx:-1 cxwswq.s9y, jes a sandbag and penetrates a distance of 73.35 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. q4 e/oizcni 66mq08quf+1j*v r j ce5jIt reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming tinu fj5e+ico 48qz 0q mr/*v6cj1j6eqhe acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with constant acceleration o1)z bz78px ymqqhl35pb(dfk2f $2.0 \; m/s^2$ 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 anu(2u o02w7m2u ixo:snc5n n s distance of 200 m. What is its average accels07o: nom nucu5(n2s2uxi 2w neration?

  An object starts from rest andi8 7krkl1muu5 :urcr8 undergoes uniform acceleration. During the first second it travels uirrm 8kk817u5r:lcu6.0 m. How far will it travel during the third second?

  An object is moving in a straight line with constant acceleration. Iaj hao5.z (0lfnitially it is traveling at 16 m/s0f ho5la.( zaj. Three seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelera1j+c5vdg dyz 7ugn)sk *4gy5ites 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 can decell +6dhx1ia5eg erate 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,rcsb ;vf :h ,fa652spq a car that has been waiting at the intersection starts ahead with a constan pf5:shvrs2;a ,qcf6 bt 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/ssnp3(g 9xql) r8c5ika( dfvl( on the surface of planet X where the acceleration due to gra5vqfdanix8s(9p) r lc ( 3gk(lvity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a speed ofypwpm4 4zsr53*liu /c 12 m/s on the surface of planet X where the acceleration due to gravity5wmiyps*lr/c34p4 z u is $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

  An object is thrown upwii69h+nme3 g w;, asytard with a speed of 15 m/s on the surface of planet X where the acceleration due to ga36iwn 9i +,hgtme ;ysravity 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 o vgr;81a 9 /2f1vls+ol wqepnzn the surface of planet X where the acceleration due t 1+e;lv zq21nl 9/gvsp8arowfo gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is 4o8) sq4b2 zq kmxdv9gusually greater than 0.10 s. If your friend holds a ruler between your finge4xg2v bo )dmsk9 qqz48rs 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 j4m+qqtze;y n8*ya(i of 19.6 m/s. What is its velocity after 34+myzea jq; (iy qt*n8.00 s?

  A bullet shot straight up returns to its starting point in 16 s. What +4 ,5-wu+ic51zsnd8, vt znrckvievwis the initial s s 1zcziw4 vew5u-v85,kndcv,i+t+ nrpeed of the bullet?

  A ball is thrown straight up with a spa0p1 k;+c dv 3mgl fpjv4,9/rjlyt:lceed of 36.0 m/s. How long does it take to return to its starting pointp g jc430pvlylt: +c;1ka rfdj/mv, l9?

  A ball is thrown downward from the top of a building with an initiaj6 pgx;fck*jwr1i5 .ol speed of 26 m/s. It strikes the groun fjp o;kcwjg .*61ir5xd after 3.5 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numerical q/z i(+xweqn-value in the bla ne(-+wqq/ zixnks)
(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 o7/ng bi.ks0kk)d+sx j gu)e;mf 44.5 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 10 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 10.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t =kx:uxm4t +17t h rdgg* 1.0 s?

  In Fig. below, what is thcw np )h4h26kce velocity at t = 2.5 s?

  In Fig. below, what is the veloci3vs6o8s(* *opupjf x pty at t = 4.0 s?

  In Fig. below, what is tw/,: my sevio )vm)-xkhe velocity at t = 5.5 s?

  In Fig. below, what is the average veloc2j p/h ky:4hsgity from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 to 6. tpxy(k kiy/ 6k990a1/6rbunjz5varp 0 s?

  In Fig. below, what isr u ri.hc:rmam6l b9 i07k;me* the acceleration at 1.0 s?

  In Fig. below, what is the lb 4 gsrcgl9p5b,4d3vw3 h7amacceleration at 3.0 s?

  In Fig. below, what is the average acceleration from 0 to 5.a nzid6a.dv 4ul8 ;*hk0 s?

  In Fig. below, what is the average az3r a,*tljof *,s lozvrp3hl e0hx26-cceleration from 0 to 8.0 s?

  In Fig. below, what is the displacemenfc9 7 ak ffk/; /zp/hnlut.qx+t from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|velocx0o-ie1+p ph city}

  An object can have a varying speed if ic6ic pwsb 1m ko4 fa1ik2.ec,2ts velocity is constant.

  The velocity of an object can be negative when its acceler cm cv c88cw) ll4mzi17y2izq/ation is positive.

  If one object has a greater speed than a second object, the firstn8aw0(qdks 9j nfa03on( jj:-vtl5 ip must have a greater ldoqs -p(3j(jan jn9:wf8n 50v0a tki acceleration.

  Two cars emerge side by side from a tunnel. Car A is trav7oq+:8e9bsy .,x7ag7yw eb lddp uur/eling 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 speewq1/ w0rm;r- +b59lyf whri akd as its acceleration decreases.

  A baseball player hits v60lm1fq0 ho ca foul ball straight up into the air. It leaves the bat w6cq lf01h0 ovmith a 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 happe2 2rlxaws f)l6ning to its acceleration, how does it change if air friction la2) sxfw62l ris ignored?

  As a freely falling object speeds up, what is happening to it 4c8 t mbi1f4ncv1l.y1,fhi cqs acceleration, how does it change if air friction CAN NOT be igcly4 mi.tic bf8qnv cfh14,11 nored?

  An object that is thrown vertically upward will ret5dzul qop9: g*chxp 4e,o+7s-:nlbj kurn to its original position with the same speed as it had initially if air resistance is negligible. If air resistance is apprecialhjpg+-5s: k7neb zx :9,u*cp4qld ooble, how will this result be altered?

  An object can have zero velocity a,;zco3 f5py-i8lpx +*tmrsy pnd nonzero acceleration at the same time.

  An object can have nonze mc d+nssemecq6y yy8k4o0)q.56xd 6qro velocity and zero acceleration at the same time.

  An elevator moving from the second floor to the fifth fon9zamn;s f)*u :sl +floor making no stops along the way has zerfufzn *:+nmaos 9s) ;lo acceleration all the time.

  A rolling ball moves s ) kh/dtrm2s5(we 9vlfrom $x_1=2.1 \mathrm{~cm}$ to $x_2=-8.6 \mathrm{~cm}$ during the time from $t_1=1.7 \mathrm{~s}$ to $t_2=5.6 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.4 \mathrm{~s}$ is at $x_1=2.3 \mathrm{~cm}$ and at $t_2=3.9 \mathrm{~s}$ is at $x_2=7.5 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quub te 8x1),uqsd+e;ne *fs- charter-mile ($1 \; mile = 1609 \; m$) track in a total time of 11.7 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its trajwpsa;c3fv x ()b ra:-iner in a straight line, moving 98 m away in 10.;j)pbxca(w r-v sa3 :f3 s. It then turns abruptly and gallops halfway back in 4.8 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 from kf1l h-+ws/nb$12 \; m/s$ 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.scown: /ezc5s qw5;pu3 :amv $22 \; m/s$ 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 sp mb5:hf;8s sgz4gdcm:eed of $31 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.3 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blockm8*5h* ex vh v)i:9p:ooqzs gss to essentially top speed about me5:i qgh*s8v ooh*: x)pv9zs $10.5 \; m/s$ in the first 12.1 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 from a speev3 aw8x*cb/x gd of $19 \; m/s$ to rest in 5.28 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. Assumin082ll .f5l pmn m*ibqzg a deceleration of pil*zl2l8bm5 fn0qm .$7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck go1cieaw ,/ sxx)ing $25 \; m/s$ 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).    $m$