Suppose that an object t cre qyno67m 9,tc ;r(vy,zkx3ravels from one point in space to another. Make a comparison between the displacement and the distance travox,rq(;r6 v nty k7c3y cz9m,eeled.

  When is the average velocity fxl.n2272gu74cgi .aywr-zy q2 fgeu of an object equal to the instantaneous velocity?

  A new car manufacturer advertises that their co /( kc1fs)td + mfc5em5zks:tar can go "from zero to sixty in 8 s". This is a descri 5som/s k)(+f5:z ctt1defckmption of

  An object moving in the +x axis)clp1zip cg8:, /l jmc experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to x p .3ehz28zwxthe East (+x direction) begins to slow down as it approaches a traffic light. Make a z .epwzx2xh83 statement concerning its acceleration.

  Suppose that a car traveling to the Westv z w-fkpo)m.x8:p- gmy9xg6l (-x direction) begins to slow down as it approaches a traffic light. Make a statement co-v):p9 k -fmpwx.6m gl zgxy8oncerning its acceleration.

  Suppose that an obje d)b.h:e9 drqzct is moving with a constant velocity. Make a statement concerning ibh :zq.e )r9ddts acceleration.

  If the velocity of an object is zero, does it mean that the accelxhf )wh23 m67o+t qanjeration is zero? Support your answer with an ext)jo+wax hnq6fh2 7m3ample.

  Can an object's velocity change direction when its acceleration is wf7 zs dso afv84l.j5.constant? Support your answer with 7afzdswfv. 4j8l.o5s an example.

  Suppose that an object is moving with constant acceleratwf99,f*hph v jion. Make a statement concerning its motion with* hj fv99p,fwh respect to time.

  Can an object have increasing speed while its acceleratiogzq4e bf*ntiv9u m8g- 42 u;lon is decreasing? Support your a b4gl;emf uqnu gi-2tz4o*89 vnswer with an example.

  Suppose a can, after an initial kiw,i73xqk v4c ick, moves up along a smooth hill of ice. Make a statement concerni,c4i ixkvq7 w3ng its acceleration.

  Under what condition is average velocity hru/fqc nz 2: e+g-u/vequal to the average of the object's initial and final velocity?2-/unzc+: eqgu/ v fhr

  Objects A and B both start at rest. They both accelerate )uod wv7ahl6z xbz.54at the same rate. However, object A accelerates for twice the time as object B. What is the fb az7o dx5u.l4 z)wvh6inal speed of object A compared to that of object B?

  Objects A and B both start from rest. They both accesc:+ ifr9q:w alerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traves :firca:9+wqled by object A compared to that of object B?

  When an object is retjfmnqaf5u-72h+ ,8i c tl,e oleased from rest and falls in the absence of friction, which of the following is true concernnf 2 ihmoj +ttf5 -7ea8,qcu,ling its motion?

  When an object is released from rest and falls inq.gtiwhoqtf ( 797pw7 s+yoz* the absence of friction, which of the followifw*ztq g o.7h 79y wip7s+qt(ong is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the velocitysw9/bqimp ;b , and the acceleration when the ball reaches the hi;9s p,wib/mb qghest point.

  Suppose a ball is thrown straightdq 4 v(,hbuywh.xkzn (kq; (:j up. What is its acceleration just before it re yjnzbd,w((;kk u4q (vhx.:hqaches its highest point?

  Suppose a ball is thrown straight up, reaches a maximum height, then falls to l+vx*.lp1lhyhj. f( t its initial height. Make a statement about the directil p jx+htfy*1.l .l(hvon of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then 7m/w(6fo)hgruv5 to gfalls to its initial height. Make a statement about the direction of the velocity o /f6u5w tmgvhg (7o)rand acceleration as the ball is coming down.

  Suppose a ball is thrown downward 7ff6 .z e ruang03z kp7ui)8f9dheq4cix ;bb5in the absence of air resistance. Make a statement concerning its accelerai6u4daheki;5n .u 8x73qrg09ffb cpe f)bz z7tion.

  Suppose a skydiver jumps from a hn0 3*ak02hgemtrm i 1high-flying plane. What is her acceleration when she she reaches tmm0geth* i 3k2a1h0 nrerminal velocity?

  A ball is thrown vertically upward wnkpc7c 6mt35+o ,ptmhv0d 5uxith 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 times higher does the second ball go than the first b+cmt t h65ku037odcmvx,np5p all?)

  Ball A is dropped from the top of a build7*9ikfqxd7gi 4 so9a;k wqi6c ing. One second later, ball B is dropped from the s6g;qa9i 97kqi 7doif 4x*wksc ame building. As time progresses, the distance between them

  Ball A is dropped from td6fk6svm0n rhacq2-e 385ij rhe top of a building. One second later, ball B is dropped from the same building. As time progresses, the differekm -r 3c6j qnh86earf s2di50vnce in their speeds

  Two objects are thrown from the top of a tall building. Oq 5,o .*xh5ozn 8atogzne is thrown up, and the other is thrown down, hxzzo 85,5qt ngo .*oaboth with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top 1jk4yq mm-o v(of a building. A second brick is thrown straight down from the same building. They are released at the same time. Neg4 jvom1-kq m(ylect air resistance. Compare the accelerations of the two bricks.

  An object is moving v/r/*d+5 g 42pm7 rxgdmwsrxn e bp,k,with constant non-zero velocity in the +x axis. The position versus time graph of this objecdv/mppk+4xm/ rw*bsxe 5rg,r7n g 2,dt is

  An object is moving with constant et -z d unfw0sp.6 fg:/1kt,bbnon-zero acceleration in the +x axis. The posit :efuz,-gk0b6/sdfn. 1bwptt ion versus time graph of this object is

  An object is moving e)rp7rt v)bxp/)zht 8 with constant non-zero velocity in the +x axis. The velocity versus time graph of th/phx rtz)8epr )btv )7is object is

  An object is moving with constant non-zero acceleration in the +x axisl 0.s vcii3f a.:wyxj6. The velocity versus time graph of this object isl y0. vxs3i:wi6j fca.

  The slope of a position versus time graph g06n a9tfdz xn3ives

  The slope of a velocity versus time .l3cm 5zkm +al0zgz*lgraph gives

  The area under a curve in an acceleration versus time graph givev5kmbm7mjt kj 3sci1 wi63n7 8s

  The area under a curve in a velocity versus time graph ,d51fz8v za , j-znfkbgives

  If the position versus time graph of an object i/qoh*(bwnav*h im gw 1/m6hg/s a horizontal line, the object ish/iqn( o bvg* wm g/1w/*hham6

  If the position versus time graph of an object is a vertical line, the object :o58m7s/.r2zl rq4qve 9o:jak mi macis r274oeqk. qsoz5 ji8m9:r/ m :lamcav

  If the velocity versus time graph of mz6af p6 gw7(en +i:e:r bl;hkan object is a horizontal line, the object is w7i(a::fphg+6 r6 nmeblzek;

  If the velocity versus time graph of an object is a s7qjm s1ubug bps7k;/- is4.fntraight line making an angle of 30 degrees with the time 7g4juuibs-.spf1k nm q/s7;baxis, the object is

  An object moves 15.0 m north and then 11.g ukw:8ddeh (w3f,a, z0 m south. Find both the distance traveled and3,khw fa (uded:z,wg8 the magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long t) 93kfrbwu*kwill it take to move 12 km upstream in a kt)*k bf3urw9 river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = tt*x4 lefn,b/1609 m)

  What must be your average speed in order to travel 350 km in 5.15 h?dg+ dbdj.3 h *3j,esxu

  A runner ran the marathon (approximass lk ejitep:lt1nj) 0h .v018 k*.tcktely 42.0 km) in 2 hours and 57 min. What is the average speed of the ruvik.)s 0t0p tjshk 1 ll.j8e*1te:ncknner in m/s?

  A car travels 90 km/h.wp;p 6 0pzn57,vqk7ykw2n mfq/3ycpw How long does it take for it to travel 400 km?

  A ly (light year) is the distance that light travels in one year. The speedo/a* dr*tlq; n of lightt*;qn*oar /ld 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 w1tmvd nobz1)kod); 2 km/h along a straight road and you look to the side for 4.0 s, how fa k1d; woz)2)ovdbm nt1r do you travel during this inattentive period?

  If you run a complete loop z cfcc5e y( +yln0zjs)ts2f+(around an outdoor track (400 m), in 100 s, your average velocity isycec5fs+c f2+z0yszn t)l((j

  A polar bear starts at the North Pole. It travels 1.0 km south7,uu)vynvc ),v+ ayk/kwf .km, 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. Wfuu nk,wyy/7. )cvm,v v )k+kahat was the bear's average speed?

  A polar bear starts at the North Polzwz3n cdrz, 7.e. It travels 1.0 km south, then 1.0 km east, then 1.0 km. zwnd,3rz z7c north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home6u1tqc1x*48n r gvqxd on a weekend from school at 55 mi/h for 110 miles. It then star8d1t r*qu4ng6xq1xv c ts 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?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What is the alga9 q54so4hs verage speed of the motoris4o4 sshg9 q5lat 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 averf)ylyoi3+z c06 +gvh5ququ/ gage speed for 3lq 0gz/+ygc5qh+ 6yu iu ofv)the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h northdd7q)(7jem rugnsy4 3 for 750 miles. What is 73ysn7(ddem4 juq)grthe average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 100 m)u sx,rprpd +p+*x00kk 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 final leg of the race,kx+ pprsudxp*+k0r,0 in order that the team A runner not lose the race?

  A car decelerates uniformly and comes to a tj2 s apw f-qe+qt4,b/b m-m-(td;bzsstop after 11 s. The car's average velocity during deceleration was 53 km/h. What was the car's fqs ebtam 2b dm,t+j-b 4(w;qz-s/p-tdeceleration while slowing down?

  An airplane increases its spedxfc (g.6jfsyjh* z1; ikm*6u ed from 100 m/s to 160 m/s, at the average rate of z(u c61; s6ihjgj fkdyfm.x **$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerater43 5w(fsbuf6*a: t 1mt uydjts 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 accelerat(gu1y1xpvex ya2myxc9e 5:g7es 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 jt np/7l vh.*8m kazr;6hyw1yspeeds up with a constant acceleration ofl* 6w h.;7 jrpyhn1 y8t/vmzka $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of bt2 nl:0i c2yfqa gqh(9z6gd2j nls4*3.4 m/s experiences a constant acceleration ob2 ( 9hlcn4ql2f2ns:i6 t*gj0 dqygazf $4.5 \; m/s^2$. What is the cart's displacement during the first 6.1 s of its motion?

  A bullet moving horizontal2q/z lf:a *,w)k4;xahlqvfbg ly to the right (+x direction) with a speed of 535 m/s strikes a sandbag; lb:*khxa4al)z ,gwv2f/fq q and penetrates a distance of 74.44 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched o26t jc63tqqzo2p of4from a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this re2oco pq3j t2oz6 f64qtquires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest move/a2bav-id n d a2e4cadka ;-a6s 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 distancer+/tv)iscidcbyp+ 5 2 of 200 m. What is its average acceleratioid cri)ps 2+vbyt5+c/n?

  An object starts from rest and undergoes uniform acceleratio bw ua01lgo vh;*yn6 x:mhn-;cc/h a/fn. During the first second it travels 3.5 m. How far will it t a o/1/cwhna ;*6 h-byu;cflgxmn:v 0hravel during the third second?

  An object is moving in a straight line with constar1n- lf 36lbwu6,kpx jx +:oljnt acceleration. Initially it is traveling at 16 m/s. Three seconds llxull rp6-fb3j:w+k16 j,x on ater it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates unifo e wp2)hphay8u)x.r x6rmly 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 atfirijuzs54duaw, t/, h7 7 +ez 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 c ye2mjb-5j5y(gvl c c3ar that has been waiting at the intersection starts ahead with a constant accelerationyye(cj5jgcl2m 5 3b- v 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/s on the surface otnw2 egf/3i4d,w3oo) 5pp rfmhei(;uf planet X where the acceleration due to g/dephgfnpf3 o 2 im4ew ;u5wrio, 3(t)ravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a sp m*1xqic*2,q) e lrta )r(orjweed of 12 m/s on the surface of planet X where the r*m r)jr*ocxt ilq(e)1 aq2w,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 sur.fr;+c krz8:d rhf0 oiface of planet X where the acceleration df. i8 rhrr0;: fodkzc+ue 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 o-.5qt9 qu azemf 14 m/s on the surface of planet X where the acceleration due to ta. e5uq qz9-mgravity 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 m:n; bnl d2/bra ruler betlbn2m b:/r dn;ween your fingers and releases it without warning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward w4yc ) szxvc )q3 8i*ql/bxxxgjvcd;3dd 07w; at a velocity of 19.6 m/s. What is its velocity after 3.00 sw)w3dbd v/)dx 43vxqcy*xqxj7c ;gzl; sc 08i?

  A bullet shot straight up returns to its starting point in 6 s. n/qg /oiz. 2(o2d agig use67nWhat is the initial speed of the buln q 6igou7as.(oz/ eg2g/d i2nlet?

  A ball is thrown straight up with a spejym2kgsym6i *k rl)+0 ed of 36.0 m/s. How long does it take to return tk 2myjr*06mi+s glk)yo its starting point?

  A ball is thrown downward frmu;zby4 a0;lk vch;o1 om the top of a building with an initial speed of 9 m/s. It strikes tho;vhm0c lzkyb u;4a;1 e ground after 1.1 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only film .aksda)k6bn674iae( ir x9jl in numerical value in 7x9an)6 .iskrjkb6(4 aim deathe 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 wit(nu)k hkn3gc x,q.0qjh a speed of 21.1 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 8 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 8.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is t1 y1k xa mw,ls5b klwam.+o+mv3l.*fghe velocity at t = 1.0 s?

  In Fig. below, what is the velocxw0vj jq8*k u;ks((o ,x ubb4qity at t = 2.5 s?

  In Fig. below, what pnuw3. zel5m s ;/w5cyis the velocity at t = 4.0 s?

  In Fig. below, what is the vepg3thn(91 3z.*r 4 7tmprglr ycu8 akwlocity at t = 5.5 s?

  In Fig. below, what is the average vyl ndaq +ea,)8elocity from 0 to 4.0 s?

  In Fig. below, what is the average vept x0;xam-)hk ngktf+ o6 fftm,11(gklocity from 0 to 6.0 s?

  In Fig. below, what is thh hv wq(9i6bm9e acceleration at 1.0 s?

  In Fig. below, what is the acceleroqeq6 , v) sx(9ao9jm/uh 2qtqation at 3.0 s?

  In Fig. below, what is the averr +n (qe4/:, uvizbalolq(oy )age acceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 to 8ol 1ruwur1 *z;oyi38ja(w5 gq.0 s?

  In Fig. below, what is the dme: aeyj/ p76duqp3mjs / )ex(isplacement from 0 to 8.0 s?

Does a car speedometer0:j 8)7qu lfxhux)bopm(hqx nd1z6z8 measure speed, velocity? {speed|velocity}

  An object can have a varying speed if itg fgg8qvy8 jm- 7*2qwms velocity is constant.

  The velocity of an obb+i ;uka4 *fhnject can be negative when its acceleration is positive.

  If one object has a greater speed than a second object, the first must hav,.wg zge1g )vylm p:,;h jzk(te a greate:,l(mp)jge.1,y gt vzgwh;zkr acceleration.

  Two cars emerge side by side from a x0;, ( wbxdozetunnel. 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 itq n70;ptv zoi*)eahm6s acceleration decreases.

  A baseball player hits a y0-e6ngq 9 gz(dgqew0foul ball straight up into the air. It leaves the bat wi gq0ee(6zqd-gy09 gwnth 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 happening to its accelpgc * 9g -a6:5yeikmetx0tso4eration, how does it change if airp 4 ee ag-ktc:o*m59 isyt6gx0 friction is ignored?

  As a freely falling object speeds up3nyd/aa*gefh r. :b2 f, what is happening to its acceleration, how does it 3f:* /n. geyfa2brda hchange if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its original posiz :pm-8ii 6yhhi2o; zn r8nu:ntion with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, n y8zhhpr2;n: o i- i:6uz8imnhow will this result be altered?

  An object can have zero velocity and nonzero acceleration at the same :kp* du n+m-tspa2b2 zidnge 6/j*j8n time.

  An object can have nonzero velocity and zero acceleration at ) :gyes9mqjyr*,cg5v the same time.

  An elevator moving from the second zrr )our ;p0w0floor to the fifth floor making no stops along the way has zero acceleration all the time u0)rrz0;powr.

  A rolling ball moves db y:6h /cq;fflhtv 59-va4hcfrom $x_1=2.6 \mathrm{~cm}$ to $x_2=-5.8 \mathrm{~cm}$ during the time from $t_1=2.3 \mathrm{~s}$ 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 $t_1=-3.4 \mathrm{~s}$ is at $x_1=2.4 \mathrm{~cm}$ and at $t_2=3.5 \mathrm{~s}$ is at $x_2=8.4 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight co0 f tmif5zc 9q0pid ;9fkk-5bumplete laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 10.9 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its traicrb;z-uq . ct;j( s4icner in a straight line, moving 111 m away in 11.1 s. It then turns abruptly and gac z;(s -r;tci ucqb4.jllops 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 fromm4x6jxo 6 loy; $11 \; m/s$ to $22 \; m/s$ in 5.2 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 fror dbzq9ozf x:,m 4 6))bwtqd,0cy.bdfm $18 \; m/s$ to rest in a distance of 84 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach s5c6 5 k )ayg3g sigxd,;xo)dea speed of $27 \; m/s$ 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+p2r v-8 aqqrnva7uvh 6p4t)k the blocks to essentially top speed abouv27vp a)8arv4upqrkhqn-t+ 6t $11.4 \; m/s$ in the first 12.2 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 uniformly from e6(qcls98ji npn q t(9lo: w:rwl3j*ga speed of $18 \; m/s$ to rest in 4.12 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 m ji/e7eyiu(t zbv* //y long on the highway. Assuming a de7vyieei/ tu //ybz*j( celeration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goinxg ;f s4vvwc7-g $25 \; m/s$ 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. Aftjze11/d q8:tygwiv 91v7x nrb er exactly 27.0 min, there are still 1100 m to go. The runnev1gzexw19 dr8vy 1j:7ti / qnbr must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$