Suppose that an object travels from one point in space to anotherhb 23spkg.+l x. Make a comparison between the displacement and the distance travelgx+psbl 3.hk2ed.

  When is the average velocityybalu),,iy j( of an object equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to sixty in 8t(g/ vw(;b icq*aga.d s"ag;.qbc/daw(*g tv( i. This is a description of

  An object moving in the +x axis experiencesy*/*(ozgme wygr/z kh2eh*z 2 an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction xf+h/;xu9)yged d2b n) begins to slow down as it approaches a traffic light. Make a sb uhdx)x; gy2d9f+n/etatement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) bcarx5*7t.fmgf / r 4fxegins to slow down as it approaches a traffi a 4xxmf7fgf5t*c./rr c light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velomq r97(zggjj0city. Make a statement concerning its accq 0jm(7gj gzr9eleration.

  If the velocity of an object is zero, does it mean that th8 l(3piee u /ft9ipamsko3o7+ux5pt7e acceleration is zero? Supportttp a9pm533 oeo/l7 i( e 7fixp8uks+u your answer with an example.

  Can an object's velocity4a t ,:*emxkl z7qkvh. change direction when its acceleration is constant? Support your answer with an exame,aklqz4x m*t7v h.k :ple.

  Suppose that an object is moving with constant accelerationyy :q3qylici)15pydb hn lb;/,.fku4. Make a statement concerning its motion with respect to time.)ny.qib 3lqkbyp5hy i ulc/yd1f: 4,;

  Can an object have increasing speed wl1qzi o)p6b3p hile its acceleration is decreasing? Support your answerlibo1 3 zpp6q) with an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice. Makyk:p7ijl-d1a(eid3 h8 lu6 j ce a statement concerning its l7id-u 3cphi 1(:8deyjljk a6acceleration.

  Under what condition is average velocity equal to the a7 c2:bt*tz xw/x b9xmoverage of the object's initial and fin2x9t:bcz7bxt *mo w x/al velocity?

  Objects A and B both start at rest. They both accel i4l f54ncsa4 ..zqrxoerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object ar4q lsifx44c .nz.5oA compared to that of object B?

  Objects A and B both stqoe0w zl9 3v.,wgxf5miog z-9art from rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object.xq9 9oz iwolfv3mz e 0g-5g,w B. What is the distance traveled by object A compared to that of object B?

  When an object is rele dmdfzd*d35:g ,( rvp/y ek fawa+g61qased from rest and falls in the absence of friction, which of the fod/35qvr fae6dgk1ypafm wdg z*d(+,:llowing is true concerning its motion?

  When an object is released from rest and falls in the ab rk;*s cr-nrd2sence of friction, which of the following is true concerning its;nd rr*r2 c-ks motion?

  Suppose a ball is thrown straight up. Make a statement about the agxk6u( +)6a; dj rqmevelocity and the acceleration when the ball reaches the highedg66;ae kj ra(+)xmqust point.

  Suppose a ball is thrown straight up. Wf8,l; 3aenzplhat is its acceleration just before it reaches its a ,f l8zp;e3nlhighest point?

  Suppose a ball is thrown straight up, reaches a maximum h5 3 o52tfplwyeeight, then falls to its initial height. Map52y5eowt3fl ke 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 fal jac+*2bfd1vuzyyz 61 s1sf 4ols to its initial height. Make a statement about the d2cfv1us*y 4f j s1+ozba z61ydirection of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resh bro9ki8i;zy.nz999vql md xd-u* o.istance. Make a statement z99okiu oqv -ry99 z8;im.*hld xd.b nconcerning its acceleration.

  Suppose a skydiver jumps from a high-flyin w 0toi.(exje6g plane. What is her acceleration when s6 w0exo.( jiethe she reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical second ballnq211jf y- w5ydh yd.h is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the second ball to thaf . wnhj25d dq-1y1hyyt 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. One second later, b0yy/qo lc: d;jx/jv+jall B is dropped from the same building. As time progres+dcjx/qyl y/:o jv; j0ses, the distance between them

  Ball A is dropped from the top of a building. One second later, 7z5gpm)09 jkjw-p3jbf j4* yqtv x*cgball B is dropped from the same building. As ti5zv4cbp) pqg jgk*j93t0*wyj -jx m7fme progresses, the difference in their speeds

  Two objects are thrown fr1i)x3a e 0y*or+qjy o0 jmrit/43 tolwom the top of a tall building. One is thrown up, and the other is thrown down, bothjtxjwi3)ra1t+y3l/o*0oq iy o4mer0 with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top ys3r:hl nro01 of a building. A second brick is thrown straight downy 3s:n1r0rlo h 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-zero velocity in the +x axis. r0pml8 8d ppn)The position versus time graph ofmp8pd)0lr np 8 this object is

  An object is moving with constant non-zero acceleration in t70jigmn 4db/eq;ykhw +t1k d 1he +x axis. The position versus tik / w+g4kyh0qt1jid1d;7 be mnme graph of this object is

  An object is moving with constant non-zero velocity in the +x axis. Tefrh0qyp4)8*fy yx a *s3sb:f he velocity versu )*f ssfrayb 0*hyyefx:8p34qs time graph of this object is

  An object is moving with constant non-zero acceleration in the +x axis. w+h64 b/gxgle The veloc/ wg+6l4h xgebity versus time graph of this object is

  The slope of a position ver 5xev)(ae /wyesus time graph gives

  The slope of a velocity versus time graphk r/uqyy3uvb-cv+0 r*hwvb/ 6 gives

  The area under a curve in an acceleration versus timjrn3yyka. y q*,im4hbk*4ojm :o /9pye graph gives

  The area under a curve in a velocityjkz c)39n2n;lav:ej u versus time graph gives

  If the position versus time graph of an object is a horizonta:cyj-z6o8 7pxl d6l hu. eawz4l line, the object is4e jywc- up8z. 6l:7 hodz6lxa

  If the position versus time graph of an object is a vertical line, the rx y888vzhvzq5 z/i 4lobject is zx 84vh8vz5yzqril8/

  If the velocity versus time graph of an objecd qszqb:wgw250p.b7c,)ugmdye -0l bt is a horizontal line, the object isps w -0lde q,mggb5zw d0)2.ybqb7 c:u

  If the velocity versus time graph of an object is a straight lm;pth ;c i 5n+q(tvuh 2*m(eqfine making an angle of 30 degrees with ; fhqqptuvtm c(ie(+2m ;5 *hnthe time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the distancew 2oadqk2c 1zxl9k mz6bu5y02 traveled and the magnitud6oq5uy9kcbd2 xz 01z2m 2wlkae of the displacement vector.

  A boat can move at 30 km/h in still water. How long will i*;5f(og7 xgw cjun4 zkt take to move 12 km upstream in a river flowwjc75xf (ogg z*4nu;king 6.0 km/h?

  55 mi/h is how many m/awhn.ax8 - 71g*v 1pqy lx-ouus? (1 mi = 1609 m)

  What must be your average speed in order g 3 qnaes-2xhw831hiz to travel 350 km in 5.15 h?

  A runner ran the marzl0v z.8+jrko*mkh *gathon (approximately 42.0 km) in 2 hours and 57 min. What is the average speed of z*8mgjk .0zo*lhr+k v the runner in m/s?

  A car travels 90 km/h. How long does it take aguoo4, yx0.tdbh 8:sjl 9u,vfor it to travel 400 km?

  A ly (light year) is the distance that light travels in one year. The speed ofy r-yan(k(oe; lighy-;n( ker(yaot 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 alonglq2j 64q;yuo r0u+t yy a straight road and you look to the side for 4.0 s, how far do you traveyuor0tq2; ljq6 4u+yyl during this inattentive period?

  If you run a complete loop around an outdoor trackhub hr41xs*mb 1 9m-* 2ikt(4ggwstwr (400 m), in 100 s, your average velocity(*g19 -bmbsw4r4kwh m 12*trtg sx hui is

  A polar bear starts at naev .0*tw ce)6 j6dfkthe North Pole. 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 trie 0t* d6.wvjea6 kfn)cp takes 45 min. What was the bear's average speed?

  A polar bear starts at the Nora)brnzx (xud.8- a3 /( hxhc*vxf pqr3th Pole. 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 startdcr*hpx x .au3hz( )x3xq- vf8 /br(aning point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 miles. zgpo1- ourfcd y7-wi yeg7*+-It then starts to snow and you slow to 3 7*-ciuoed p 1z-+yofg-y7rwg5 mi/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 the averayynf( n o31;rb34lckq ge speed of th1 ncky 4fyob;r(nql33e motorist for this trip?

  A motorist travels for 3.0 h at 8se /7*da44o hhp0mq el0 km/h and 2.0 h at 100 km/h. What is her average 4/ 7p40*heqa mhsd olespeed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h andh,t)d/ce i b *,tp4o/ysxh/ no then at 250 mi/h north for 750 miles. )/ni,/ /ce4,b* hohtd xsypot What is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs/hfvs8vbpdc5* 2 0g /dbvfa t5 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 starts the fi0fg5bd/b/ 5 cfv2ph *d8 vtsvanal leg of the race, in order that the team A runner not lose the race?

  A car decelerates uniformly and comes to a stop aftermpnz zg;w;fwbn8+3)c 11 s. The car's average velocity during deceleratio3+z z nw) 8wfncgpmb;;n was 36 km/h. What was the car's deceleration while slowing down?

  An airplane increases i wp8 tjsr;(70c 2yx 8vfy*ngiyts speed from 100 m/s to 160 m/s, at the average rate of c ;n07x88si2 yj vgf*rw p(yty$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at z8(7wchtg - ee qutnf705s)( vyre2j xthe 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 accel7yrm ja;o 9cq9erates 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 uvy0xf04 02jatei- qgjxm 6 ni)p with a constant acceleratioqx0y t4 n6)vjei0f m ig-xaj02n 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 5.5 m/s experiences a consqphzs((e h ,f;n0b1os tant acceleration of(1b;fhqnes sopz(h 0 , $2.0 \; m/s^2$. What is the cart's displacement during the first 9.6 s of its motion?

  A bullet moving horizontally to the right (+x direction) wit lmzqyu y1ykwdj3b8+m(w -u7-h a speed of 336 m/s strikes a sandbag and penetrates a distance of 90.93 cm. What is the average accely+u7(wdm wy3 ybmq81ju-l-zkeration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a ca jq1gt2q+2-wtn,*rah ormh a1q (5iiltapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this qq5hi-g2on lm,(htr+ rj ia2 w11a*qtrequires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with constant accelery7*hi hwl)xm+ation 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/ns;*e rxcarz2 6et3 v(s to 80 m/s in a distance of 200 m. What is its average ac(v6r 3ter ;ns2 acxz*eceleration?

  An object starts from rest and undergoes uniform alh2 fze8 ei6jw6k i2kx--a ue1cceleration. During the first second it travels 1.2 m. How far will it travel during the third se liikf zk a6-ehjx628w1e2-uecond?

  An object is moving in a straight line with constant acceleration. Initial nzq)8ojrq(rw,81li yly it is traveling at 16 m/s. Three seconds later it is traveling at 10 m)l z8oqj8qw1i(, n rry/s. How far does it move during this time?

  A car starts from rest and accelerates unifor-3k7 2ar3p,i topkyepmly 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 decelg.9 88eczhihy 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, a car that has be8w6ik-yhrxu(. cm ju: en waiting at the intersection starts ahead with a consiyuc wr8 j:h k6u-.(mxtant 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 1 7esq7 9fawfdhg6/ucp1-yol2s4ox.z2 m/s on the surface of planet X where the accelerat /sqeda649 f 27 7-1hlgoywsx ofup.zcion 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 th8-y-k0c obo5 uxr:ehjdtzo ;1hf.tp5e surface of planet X where the acceleratiote 0h5 c1zk x;hobuoojrtp8:5.y-d f-n 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 agesolhm:* e v(d 36hz, qo6m(m/s on the surface of planet X whered asz * he6(v6,hgl e3:(oqmom the acceleration 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 thwbjr:7 xs wo:k(wi;ko:)y6 fv e surface of planet X where the) w7:(rw;s: ovj kbwi6:xyokf 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 yo9eu mxub b;4j01efm/ our friend holds a ruler between your fingers and releases it without warning, h9 f0mumx;oebb/u j e14ow far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity ofak8ky:mg 9e ym0*p:ab 19.6 m/s. What is its velocity after 3m g akb9*p:ma08 y:eyk.00 s?

  A bullet shot straight up returns to its starting point in 13 s. What is the/f -rt-o ;n4a2pm;l y5ox zqcq initial sp ol/q z x2;f4;tq-m opy-ac5nreed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long xyrpghacj,g +qq .74;n qs lt(;8zi8osp :m8sdoes it take to return to its startiz s hp7xct4sj;, a:o.ysgq8nm p q8qi;g+(rl8ng point?

  A ball is thrown downward from the top*f4qr7yz pd4qjw3a w( of a building with an initial speed of 12 m/s. It strikq 4*p3a jrwfy( zqd7w4es the ground after 6.2 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numericgf.ll(ewv h ek- v,(x+al value in the.hlex(vf(lv-e g+ w ,k 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 43.dha3bvug;1+rrm 9,x4ta kn-* sbdfr77 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 1 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 t;*ui bnpuw 7 s)1e+(zbzjlo3( *grjdxhe velocity at t = 1.0 s?

  In Fig. below, what is the vel1 wy.os(o 0s i5m88ek xqcrld:l78dzyocity at t = 2.5 s?

  In Fig. below, what is thch3sr1fg9 g5o, pbw -aneum0fj+8s0ce velocity at t = 4.0 s?

  In Fig. below, what is the velocity at t t.b-wpc.p f6 8dh8 vet= 5.5 s?

  In Fig. below, what is the aver:pqcf2lkl4/mznez5 j(o2 z p* age velocity from 0 to 4.0 s?

  In Fig. below, what is 7osr.ol /yx3w(y zp 3uthe average velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration at 1.0 7 dqvj (ns 5:1mffa8npaz-u4 hs?

  In Fig. below, what is the acceleration atfbgt9k0-bm* ppcze )- 3.0 s?

  In Fig. below, what is the average accelerationpz mo997zrng;hvqd 6.p:r d,b from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 toxo bq7mni ;uw cjy7++o,; hms7m0s)vk 8.0 s?

  In Fig. below, what is the displacement froi(xc2+e/f0sdi8 v. d yemlum 3m 0 to 8.0 s?

Does a car speedometer measure speed, velk e tbttndw4ect6)+(x:; +gw, yfnz3zocity? {speed|velocity}

  An object can have a varying speed if its velocity g /f v5q284sfw co4jbeh 3uhnm81pp3p is constant.

  The velocity of an object can be negative when its acceleration is positiv3b) 7ter5 t,prof 5kvje.

  If one object has a gpud+ a-* :uxinf0zow(kss93g, yc jo1reater speed than a second object, the first must have a greater accu *0g 9o+jnpzkyofa(cx,u:i3s s 1w-deleration.

  Two cars emerge side by side from a tunnel. Car A is v1 8ir*jdm lb*rqk/h2p bq51vtraveling 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 acsfm ;q;g p+ )x7wcco8uceleration decreases.

  A baseball player hits a foul ball straight up into the air. It lunf yqwp5ae 1gp r+,p* )q-lo6eaves the bat wit+1elw 5foray*gnpu -,q 6q )pph 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, wh w;xbwfe w+9/jkw7on- 7zrj b/at is happening to its acceleration, how does it change ikw rfw-wj7 bj9x/ e/bw+n7 z;of air friction is ignored?

  As a freely falling object e73nlkw6db0u5-5 z xnn h1cthspeeds up, what is happening to its acceleration, how does it change if air friction CAe1 05 6h3d7ncthuw5nbznk-x lN NOT be ignored?

  An object that is thrown vertically upward e/7;ynm r ir;f0k6gjz aqx; +ywill return to its original position with the same speed as 7jrnki0qa mg+/f ;;ez;r 6 yyxit 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 nond3opq t26rft8zt 5 sk/zero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at the same8rwf)n1m9 qvyr(-:wry ne;t k time.

  An elevator moving from the second floor to the fifth floor making no stopsi n.vhpa.2xz:p gm;uf74 5ota along the way has zero accma5no .f24.ziu;hpagx t7:p veleration all the time.

  A rolling ball moves f:cb9) bmj m 7rje4vd0(kczrl:rom $x_1=1.7 \mathrm{~cm}$ to $x_2=-5.5 \mathrm{~cm}$ during the time from $t_1=2.6 \mathrm{~s}$ 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 $t_1=-2.4 \mathrm{~s}$ is at $x_1=3.1 \mathrm{~cm}$ and at $t_2=4.1 \mathrm{~s}$ is at $x_2=8.1 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quart cww-/y8a 5wtder-mile ($1 \; mile = 1609 \; m$) track in a total time of 11.8 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away f. f1ct* n;z1ny.xpekjrom its trainer in a straight line, moving 101 m away in 8.9 s. It then turns abruptly and gallops halfway back in 4.5 s. Calculate (a) its av 1.k.n1cjenztfp ;xy*erage 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 4/..kx7 8sluwmlp- sxsf v uh3$13 \; m/s$ to $25 \; m/s$ in 4.2 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 frodlg2-1yeov c 8m $21 \; m/s$ to rest in a distance of 81 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed od1itqajn rp aaubhd1k,134 2+ f $26 \; m/s$ 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 9t8xwsu l(hkyp)xd3g)bp +d,blocks to essentially top speed about dpsy)9+glxd t)xb( w h,3pk8u$11.2 \; m/s$ in the first 13.2 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 uniforo32 zaw q0ii+dmly from a speed of $16 \; m/s$ to rest in 4.85 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car qq tc,6 (jik6ileaves skid marks 92 m long on the highway. Assuming a deceleratikq 6j,(6 iqicton of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goii2u ew,d1rzb- olyj.-ng $25 \; m/s$ 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).    $m$