Suppose that an objecemnb37db5r, auh u6(wkq( l9 ft travels from one point in space to another. Make a comparison between th fu(emla,5dbrwh 973 bq6k un(e displacement and the distance traveled.

  When is the average velocity of an rawdej35h2) uh:7hizobject equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to sixty in 41ax1;teocmcm57gg6 4 pfeoc 8 s". This is a descripo e c 7mf5c44;1oap1 mct6xeggtion of

  An object moving in the +x axis experiem2jm v38n mo/r3l/ksunces an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x directieechrw2e1/z e.u; p:kon) begins to slow down as it approaches a traffic light. Make a statement2k:;cepueh/ewr. e1z concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to fmlp zgtfr529i4;s (zslow down as it ap (r2m;zps9gflt4f 5 ziproaches a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving wg;,nm3e w2p) iply:z jd7t3b tith a constant velocity. Make a statement concerninn zigw3tjt,ly3: )e;p dm27pbg its acceleration.

  If the velocity of an object is zero, does it mean that the accelerati +lwi01i ic(kgon is zero? Support k+(gl 0w1iic iyour answer with an example.

  Can an object's velocity change direcys3 /k9-ew ggxtion when its acceleration is constant? Support your answe/s9 x -kgyegw3r with an example.

  Suppose that an object i38w gfh h.7c ,dkh:wuzs moving with constant acceleration. Make a statement concerning its motion with respect c 8w73:. hhdkf huwg,zto time.

  Can an object have increasing speed while its acc-h,ejv0yl/hr svgc 3h :6u)pleleration is decreasing? Support your answer 3evsl vg:0hh6-hcurjp ,/) y lwith an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice. M .cxe72ms l+fd 4:ct0kk;ukpm ake a statement concerning its accelem27mkk scuk 4pf+:d 0.tc; lexration.

  Under what condition is average velocity e( 3ejwo5h )m3 ywv4mp hzu4e i,10lmepqual to the average of the object's initpu4m4hz13y, 50hm 3wopl(ew )ejivem ial and final velocity?

  Objects A and B both start at rest. They boj euc mw+k3ijl(uh;51 th accelerate at the same rate. However, object A accelerates for5 je3w(;juu +i hkm1cl 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 frompq)j /xao :bp* rest. They both accelerate at the same rate. Howevqxo)ba /p p*j:er, object A accelerates for twice the time as object B. What is the distance traveled by object A compared to that of object B?

  When an object is released from rest and falls in tvu te3 75(iz)tz afjo-he absence of friction, which of the following is -a) 5izjvu3zo f(ett7 true concerning its motion?

  When an object is released from rest and falls in m 2k cz62cd/0*pu5z*kb uh yhfrh9u*g the absence of friction, which ofpkc2*ubuh 6cdhrh**yzz m u0gf5/9 2k the following is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the velop;c,hdr a:de *s-9wxkcity and the acceleration whea-;pxkcr9 dw e:*s,h dn the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration0o.bi 1g w4ms(vu o/ro just before it reaches its highu(o0 4/ 1bog vows.imrest point?

  Suppose a ball is thrown straight up, reaches a maximum height, .h(4-+mu sgo/duze-ov gw 7xethen falls to its initial height. Make a statement about the direction of the velocity and acceleration as the xgeom4+d7u (wuosz. h-/egv- ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls to its i;7 r hmhr0;/yk j*mucunitial height. Make a statement about t /0*m7 h;c;hjyurumkr he direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in c0q im;w eurmu;oa52ukh0 8*.i ush4 gthe absence of air resistance. Make a statement r2 m;.uuk0qe8;c 05ahw4 *mo giu shiuconcerning its acceleration.

  Suppose a skydiver jumps from a high-fd:fbpoo.0cww/o1 c 0;oqkxa3lying plane. What is her acceleration when she she reachpc. /w:0w1aodf0c; oxo o3kqb es terminal velocity?

  A ball is thrown vertically u f.qg9idyxaq. p1;2zukk*k(upward with a speed v. An identical second ball is thrown upwai g u*kqyu.kp(.z1q9fa x;dk2rd 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 ball?)

  Ball A is dropped from the top of a building. One second later, ball B isru4zu (bdwo-d ;ti;; i dropped from the same building. As time progresses,4idoub ;(u zr-;tw ;id the distance between them

  Ball A is dropped from the top of a building. One sec.rfdh )5),(guv kgbcm kz- z8bond later, ball B is dropped from the same building. As time pro zk)h,d( bz -8 r.cv)gfkug5mbgresses, the difference in their speeds

  Two objects are thrown fro8kp(x l;phc ,sm the top of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when thep cxsl8,(; phky hit the street?

  A brick is dropped from the top of a building. A second brick is throwzexe;8dy n l-8n straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations ozee; d-ynlx88 f the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. The positiov7 zds* w1mff1n versus time graph of this dfz1* 1fsmv7wobject is

  An object is moving with constant non-zero accel.:2/ bvc acbqowj,h )fde;; lheration in the +x axis. The position/; vhhoebc:a2ldj bfq.;,w c ) versus time graph of this object is

  An object is moving with constant non-zero vem;g 8 f*t+fwv(ftd6 sblocity in the +x axis. The velocity versus time graph of this objectmftv8bfs +g;ft( 6d*w is

  An object is moving withl- tlqb8)p, sl constant non-zero acceleration in the +x axis. The velocity versus t llt-q, s)8bplime graph of this object is

  The slope of a position versus time graphi)6m)im4tz d d*ee ue; gives

  The slope of a velocity versus time rl lckas4u/u+9* s4l j*rgti( graph gives

  The area under a curve in an acceleration versus time graph s 3q)i-*yqboha6ht7l gives

  The area under a curve in a velocity versus time graph 3.+goxt.sej 2v ac t.lgives

  If the position versus time graph of an object is a86p:wi1p*vthp 6mz-6, n yqyj ,f s/ phktpez9 horizontal line, the object ieti*hp8j,/ 6w-,vnyh6qkzpz :1my sp 6t9f pps

  If the position versus time graph of an object is a vertical line39g lx3 ,uapg f/8nrrw, the object isrn x/ra3fl3 pu,w8g9g

  If the velocity versus time graph of an object is a horizontal lineirb )ta9x,k 9f, the object isf9b9ak r,)t xi

  If the velocity versus time graph of an object is a straight line making an 3iy) lg0 q.s kr98z/dswk7t0u:plztrmm *km 3angle of 30 degrees t)rw7umztg*mz. ls:kp/ rlk9 i33sqk m8yd00 with the time axis, the object is

  An object moves 15.0 m north and then * g (lbu1em gb o7xizantut*m6d( b))611.0 m south. Find both the distance traveled and the magnitude of the di1nl66xz)tg(teb u)i(b *o*gd7um a mbsplacement vector.

  A boat can move at 30 km/h in still water. How long will ibiy,p9 ye 1/lm.n e 0 eca5if0o 7ug/scz;g9ykt take to move 12 km upstream in a river flowing 6.g ou b7e sf,plg9/cye.;y9akiyzm /5n1 0ice00 km/h?

  55 mi/h is how many m/s? (1 mi br .z/g -zj1ui= 1609 m)

  What must be your average speed in order to travel 350 km in 5.15vf1 a; )c91lsqyfxvo. h?

  A runner ran the marathon (approximately 42.0 km) in 2 h in+8r*gprxup0up 88m ours and 57 min. What is the average speed of the runner in m/xnup0 8*r8 +pimrp8g us?

  A car travels 90 km/h. Hoo.v8t5kh 6d+8e/vf3 kt kd9tc dhe5ip w long does it take for it to travel 400 km?

  A ly (light year) is the distance that light travels in e;uhv) ktgp46 one year. The speed of li h;v46gtp)eu kght 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 ax *5mssi ,ldk9p.u0w4r gif bcv(ir3(nd you look to the side for 4.0 s, how far do you wux4fg,ivs9k l5iic3(p(0r s b.*d mr travel during this inattentive period?

  If you run a complete loop around an outdoor tdr2cblfw) (nn/vz 2ky kr5 j5;rack (400 m), in 100 s, your average velocivr)2r;b yzk2j/wc5 n(nl5 d fkty is

  A polar bear starts at the North Pole. It travels 1.0 km8g.1vzmy ovfk y b)-5d south, then 1.0 km east, then 1.0 km north, then 1.0 km west too1dyv5-kgv.fbm) z8y return to its starting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It tra at/sgtelpg xx)jq-k d,6h+d)yvb;0 0vels 1.0 km south, then 1.0 km east, then 1.0 km north,s0x t6)ql+,v/pg b hadjge- yk0td;x) 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 home on a weekend from schoog7z.rcs;luk9*p:x .)zf,xib t nnkw*l at 55 mi/h for 110 miles. It then starts to s* nk:, fu sx.xbgi)rl zzk7twpcn; *9.now 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 cpxa9uu(gt/k0 l y qv798:9ltf-* g3 j steagjis the average speed of the motorist for this tripplt tu-*3fv xk ts( yu 0cqa987j:j9 gg/la9ge?

  A motorist travels for 3.0 h at 80 kmznu:ul nm,+5gb2; 5b ou6rn ly/h and 2.0 h at 100 km/h. What is her average speed for m55:ougn,r 6 b;n+uny lbzl2uthe trip?

  An airplane travels at 300 mi/h south for 2.00 h and then atf/tqneq rb;(w+8vo6 ,dm hav) 250 mi/h north for 750 miles. What is the average spehbe n(w6 m8+a)o;drvvtf, qq/ed for the trip?

  In a 400-m relay race the ancoomx6 w8m7wh 32xa+iflu3yvx/j/dt 2horman (the person who 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 o8mty2d7 amxil +h j32x/wv/f63uowx 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 after 12 s. dk z2ak9nia l8w,j m,gzrsde5 r+-;. x The car's average velocity during deceleration was 80 km/h.; g5e+ in8as,lwdk9am x,d.2krz -zjr What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, qg-x -l+;:r qet 0te rpgls14xat the average rate of ergp+1gtresxq ;4q x: l -t0-l$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the ratew8n 6/u afon.h hs3h k*e7-joz 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 acyjg b81.bh; ki7t+r rt $4.0 \; m/s^2$ 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 yik( 0k. map yx-x*0hqa constant acceleration of -a xkpky*h ym0ix0 .q($2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 4.2 m/s experiencey:.mt-: qydwuxt. 7boa(mk , cs a constant acceleration oftm 7ybm.ka:d cyou (, wqt:.x- $1.9 \; m/s^2$. What is the cart's displacement during the first 4.9 s of its motion?

  A bullet moving horizontally to the right (+x directioyoo2a -9 yeetqa-c6c; r97hhk*+sxykn) with a speed of 398 m/s strikes a sandbag and penetrates a distance of 59.50 y-7 qa;6a2h ky*c eoo9tkxcrhy9-e+s 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. Itf rb u/,t+g4)cnt n7bq 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 cata qtn+/b)bt 4crf gun,7pult?

  A car starting from rest movegm -j59fm x*50w isrizs 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;rqojjk** 3a-)h )zwannmru oq,+ 2kl/s in a distance of 200 m. What is its average acceler u ,nqkmj;*-)*raql+hrak 3)2 oojwznation?

  An object starts from rest and undergoes uniform accelerationbiyqegasa0+4x .e, j (. During the first second it travels 1.3 m. How far will a+(gqebes4i0, x .ya jit travel during the third second?

  An object is moving in a straight line with constant accelerat*+ rsl.cl 7t:v jfatu:ion. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move duringcj . talt: u:7r+vl*sf this time?

  A car starts from rest and accelerat6 g2:nhbkq:ifwt yrru 3v 22/kes 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 tiregdm wzyex 6+w- i +i;+8/r)vmrx,vfwcs on a dry road 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 l1p qqqe,f/2wturns green, a car that has been waiting at the intersection starts ahead with a constap2 qlq/eqw,1fnt 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/s on the srj-s:gtju,v m)bw /j:urface of planet X where the acceleration du, j/ rvwjubsm::-gjt)e to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward winnl44 b8)rc2x q1tb unth a speed of 12 m/s on the surface of planet X wheru4bq8r)2n4n bnc1l xte the 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 yl;6palb ,h 7pupward with a speed of 15 m/s on the surface of planet X where the acceleration due tpl,yb7l;ha 6 po 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 surface of4d ;(;hl d-f 9qnhprg8jlvz*t planet X wherfqngh*d8t-r; ( 9lhdvzl;j4p e the 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 g v/c *q g/pfc enob)c6nh3t;u6reater than 0.10 s. If your friend holds a ruler between your fingers an)q cco /f;pvt6nn*uhegc63 b/d 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 m/s. What is its velocity aft )za75wf, yfnqeihgt6)ov2 o0er 3.00 s?e hfz5ga6f 02t7in o,q)owy)v

  A bullet shot straight up returns to its starting point in 10 s. What is thedv;,sgv , t a*dqr.;da initisd r;*,q. ta;vd,gd vaal speed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it tncchh3ej0(2 f ake to return to its startingjec n(h 02h3cf point?

  A ball is thrown downward fromhv1f w(nsfl13l+kjl 8 the top of a building with an initial speed of 25 m/s. It strikes the ground aftw1ffs(l8+lj 1 k l3hnver 7.4 s. How high is the building?

  A ball is thrown straight up wi +ve(zlmc (ise/t8:v7/n kmn (u/zhp ath a speed of 30 m/s. (only fill in numerical value in the blae n(n7k icez :hmm(s+v(vtp/l az// 8unks)
(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 awp ,dj/n6 yx(r speed of 33.1 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 7 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 7.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t = 1.0 s? x )mygdf:3p.h3kuh) k

  In Fig. below, what is thba(ycb e8k/ )q3uato/e velocity at t = 2.5 s?

  In Fig. below, what is the yz w(ug,tp:p /tc75ktvelocity at t = 4.0 s?

  In Fig. below, what is5 es5ax 4zfzyg3f:9an the velocity at t = 5.5 s?

  In Fig. below, what is the average vel tu1rn/mda j uxt /0d5kbi;3g:tdv; u2ocity from 0 to 4.0 s?

  In Fig. below, what is the av7e(-k* pdfaayt( ah1iwhd3 p;erage velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration at: axe-y-js;cq;d61 csf 0qpka :he.d z 1.0 s?

  In Fig. below, what is the acceleration at 3.0 t p ah4*fg)x*s3z3w+qn2 deyos?

  In Fig. below, what is the average ac 6 j/ukbph3,) i;txb hih+2edlceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 to vsd(* lyuy7g3rd9 m1x 8.0 s?

  In Fig. below, what is the dispszenoi3q t i+z p(74y:yf+/bv lacement from 0 to 8.0 s?

Does a car speedometer measure speed,ks.gdqzd;*ye;-o. ap7jn h,b;vrv s4 velocity? {speed|velocity}

  An object can have a varying speed if its velocity is contkl,2y4jdev .stant.

  The velocity of an object can be negative when its acc hk+bpa1s,8 v6h:pho veleration is positive.

  If one object has a greater speed than a second object, the first mub0yncvfusw,e/bj 4:8 *ys rh (st have a greater accelerat84v:s rsb,*0(hcuey b w jny/fion.

  Two cars emerge side by side from a tunnel. Car A is traveling a w*hj vz:xd3 5g3s/grwith 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 ix83ns: 0pa i+2popqkz *97h7 c0mttdcxjf,gdts acceleration decreases.

  A baseball player hits a foul ball straight up 2 hpekev 2a:w:into the air. It leaves the bat wik 2h:waepve2:th 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 happeuo(ce) 5nvz7 mning to its acceleration, how does it change if air friction is ignored?ocmzvn 5(u e)7

  As a freely falling object speeds up, what is happening to its aci. o l36nz6bjeceleration, how does it change if air friction CAN NOT be ignon6z6bi 3ljoe .red?

  An object that is thrown vertically upward will r8e o0n778dyq;olz7b md;o02 jvm anqmeturn to its original position with the same speed as it had initially if air resistance is negligible. If air resistandvoz0lq 0eb dm ;a;mo7o7n2j 8yqn87m ce is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration at thekwf,njccf/i* z c5*q9 same time.

  An object can have nonzero velocity and zero acceleration at the same timd5t+vt3 4byn*1jr4y stj pm. ;rkr 1hze.

  An elevator moving from the second floor to the fifth floon5v qtgx).zo-5p+z fsr making no stops along the wa5-t )x.o5vnsp+z fgq zy has zero acceleration all the time.

  A rolling ball moves froo aqu9fzd f1*n(mn7,fxo0 y3om $x_1=2.7 \mathrm{~cm}$ to $x_2=-8.6 \mathrm{~cm}$ during the time from $t_1=2.8 \mathrm{~s}$ to $t_2=5.7 \mathrm{~s}$. 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 $t_2=3.9 \mathrm{~s}$ is at $x_2=8.5 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around : fr6t1olu9lkhy1 u8g 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 trainer in a straight line, moving 111 m awaycpxgdb-om0f/ wd4)-p; z z. hy in 9.1 s. It then turns abruptly and gallops halfway back in 4.6 s. Calculate (a) its average szm d-y0;d fb)cghp/xpw4. o- zpeed  (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 uohr, vnosew3(xq,0q* t;ea* $11 \; m/s$ to $22 \; m/s$ in 5.0 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 w p/k*j) f6idm$18 \; m/s$ to rest in a distance of 78 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a s,ml mi6vp( 3mbpeed of $28 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.8 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst oak. 0-pha+reiut of the blocks to essentially top speed about .parah 0+i -ek$10.2 \; m/s$ in the first 12.8 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 unifo.ik 8xp;9qc+g kesuy6rmly from a speed of $18 \; m/s$ to rest in 4.23 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car l* zdta ;lme g/jc2z;b1eaves skid marks 92 m long on the highway. Assuming a decel*z; j1;/b zetgma2 dlceration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck going ksgv0a(jzs0o/ l y15gb f/nm0$25 \; m/s$ 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. t.6tr+z.y6fc+w) h ut pth7je8c n.gaAfter exactly 27.0 min, thet7.fut +h)r8znc. awc .h6py tgt j+6ere 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?    $s$