Suppose that an object travels from one point incla am:v nm2kl12;7hj space to another. Make a comparison between the displ;akm22vla mnjh cl1:7acement and the distance traveled.

  When is the average velocity of an object equaxn q s1zg9 m0-9i)d;jeciw0j ml to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to sixty in 8:ttdtg5 d:yhhn(a )n0 s". anht: hg)( dyt dn5:t0This is a description of

  An object moving in the +e 423p59l pw.k* yc vzyjanb1a9 jlfo:x axis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) l(d( wq yrf( :*nobet)begins to slow down as it approaches a traffic light. Make a statement concerning its ae(yo:t bf *nw)ld( rq(cceleration.

  Suppose that a car traveling to the West (-x direction) begins th1,zqx /0xvl gtpyt98o slow down as it approaches a t8x9,qxyp1 / gvzt0htlraffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant ckx1 w-cl. s 7 yhy;8iv.+yjkrvelocity. Make a statement concerning its a71sikj c.c.yxyw v;+ylk h r8-cceleration.

  If the velocity of an object is zero, does it mean that the accelerat8bdttr/ s/ a8zse 34gsion is zero? Support yotssr8g84tdb/se az3 /ur answer with an example.

  Can an object's velocko4 v6jd3kt, jp4lv 3+3dmd xfity change direction when its acceleration is constant? Support your answer with an exa6d+pkx d dj,o34vt3 j klmfv43mple.

  Suppose that an object is movin)2:acll,b nx4y i u 51jikhig-g with constant acceleration. Make a statement concerning its motion with ib-2g45uy hk i ai)1c:, xjllnrespect to time.

  Can an object have increasing speed while i3adt5tk*rx7 o ts acceleration is decreasing? Support your answert 7otd xka3*r5 with an example.

  Suppose a can, after an initial kik46xka,fn oys0 xj d1)ck, moves up along a smooth hill of ice. Make a statement concerning ijo x6xykf 4k1as0n)d, ts acceleration.

  Under what condition is average velocity equal to the average 8nym e9fep68 hof the object's initial am 6fhe8ype 98nnd final velocity?

  Objects A and B both start at rest. They both accelerate km/ )zt*v 54j+zutfyrhk .uf /at the same rate. However, object A accelerates for twice the tijfkm uz zr/*tfh5)t/k+4. uvyme 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 rate.(;h4qe (45sk l/rs) cj ka)f 0voexbxd However, object A accelerates for twice the time as object B. What is the distance tr 0of()rea(vc5 x4l4;d kb k)hsqj/exsaveled by object A compared to that of object B?

  When an object is released from rest and falls in the absence of friction,*ln6ykxg * jt- which k t6j* xg*yl-nof the following is true concerning its motion?

  When an object is released from rest an3)me.ks.rr zl d falls in the absence of friction, which of the l mkr) ze3.sr.following is true concerning its motion?

  Suppose a ball is thrown straight up. Ma9 ds wifyxfotz 07.t;:ke a statement about the velocity and the acceleration when the ball reaches f;s.idfz x ty w7o:9t0the highest point.

  Suppose a ball is thrown straight up. What4zcd.9 wq8bc k is its acceleration just before it reaches itd8w4 ck 9q.bczs highest point?

  Suppose a ball is thrown straight up, reaches a maximum height, then fallsxj ;d7of-bdwas r3;z, to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is goinzj ,fa3s - odwxb;d7r;g up.

  A ball is thrown straight up, reaches a maximum height, then njos5irj2lf.7f( r+ c falls to its initial height. Ma7jfrfo .2jrlcs i+(n5ke 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. d *: gsdsl bj+2m57:jm6dwyxeMake a statement x5jy l mdeddg::*m b+s726swj concerning its acceleration.

  Suppose a skydiver jumps from s4hipave*t u c .m;n.;a high-flying plane. What is her acceleration when she she reaches tm. ht.u*p;i;nva4c seerminal velocity?

  A ball is thrown vertically upward with a speed v. An identical secon*la ois,bu2oyj/-mroz g/wrg 3x2) 5 bd ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the second ball to thau //mrgs* )25z-,al 3oxyio jbog 2rwbt 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,r/9y8 *afk yk4*m7qorf3sn ni ball B is dropped from the same building. As time progressesq7/in3ky ryk4*o9 8raf* mfns, the distance between them

  Ball A is dropped from the top of a building. One second later, ball B is d9/pfr2 u 5g3plpgazi 6ropped from the same buildingz/9gppp a 2r6 3fglui5. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is throj a(yhwhpkozkg c7zvru/ *(.24 9qln+wn up, and the other is thrown down, both *pw2zqh9.jn +(kv/ hgu4rzkc7l o(ya 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 brick8a(bz*0n vgap is thrown straight dnz gv0ba8a(p* own 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 velocityww 3io:1,v-zcre0hi c in the +x axis. The position versus time graph of thc:o-h0,zvw 1rc3 iwe iis object is

  An object is moving with c;it- jmyk7 f8pwz)j5n onstant non-zero acceleration in the +x axis. The position versus tfw8- jjtpy)zmn 5i7k;ime graph of this object is

  An object is moving with constant non-zero vc0qlb(x h,/v velocity in the +x axis. The velocity versus time lq/vx, ( vch0bgraph of this object is

  An object is moving with constaa5rh03i mi;n ant non-zero acceleration in the +x axis. The velocity ver0ii;3hmn a5 arsus time graph of this object is

  The slope of a position versus mz:d;aruz ,,kd(yito b0 d q4-time graph gives

  The slope of a velocitpwytn non1.p:n *-t( ,ijo6 z c(vp.ody versus time graph gives

  The area under a curve1o8 j47cf pyzf;ogbk) kcd4f ( in an acceleration versus time graph gives

  The area under a curve in a velociudi xax1v1l1 j00,pk fxf9d-ity versus time graph gives

  If the position versus time graph of an object is a horizontal line, the obp-qgx6e dy -n:-fn7jsject is ns6-je gf-npx:7d-qy

  If the position versus time gra8 + otro44l slxf2w iv7 hwnc/ce1d.:lph of an object is a vertical line, the object isx2w+ : r4.o 7lw4lhcniedvlcs/o f18 t

  If the velocity versus time graph of an object is a hori*, 4u4w(z j(cgyaa 0w5dtj jxvzontal line, the object ia0dwu,((*45aw ycjg xjj zv4t s

  If the velocity versus time graph of an object is a straight line pdiz +3t:h0vit vv+(jrys2k5( j*e k9h bzap8 making an angle of 30 degrees with thez9d:(03k jvvppzahj 8t+iitb rh* k52 y+s e(v time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the distancedi1rzzl/5m8f)s vvf) traveled and the magnitude of the displa)zmv/s5izf 8dlfv 1r )cement vector.

  A boat can move at 30 km/h in still water. How long will it take to 8wgb0nvo1 (-;ui k4c f ddx-pumove 12 km upstream in a river gcbf-pkno 1wdu4d8i - (vu0x;flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = f pmmq70berai*f -xq+,e/:tw:rhg6 n1609 m)

  What must be your average s,kzkm*fnc v6ddlb 5*q+t8w 6o peed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approx tonjb;kw;s6e g:nieke)7qihd l5 996imately 42.0 km) in 2 hours and 57 min. What is tn5: 9kwke 6)th79 gnlj;sebei;od q6 ihe average speed of the runner in m/s?

  A car travels 90 km/h. How long dm t5k5ird *1lf3 iht4brsy *9poes it take for it to travel 400 km?

  A ly (light year) is the distanma vnu4*6-..6.u*6dsztnd patclux mce that light travels in one year. The speed of light cup 6z v axldnt.m d 6u6*sn.u*-ta4m.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 the siddd r 7,r*o(, vcnfh-yne for 4.0 s, how far do you travel during this inattentive pero(*n rndc, dr,h7-fy viod?

  If you run a complete loop around an outdoor track (400 m), in 100 s, qpa*h wa) f;i5cr;kdwv5 *wn7your average velocity * *w;anivkd;w af5p )cr75wh qis

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km e-j-r yo-f+chg79t o lelz2 h s,nd)wl7ast, then 1.0 km north, then 1.0 km west to return to its starting poi-hwzt,n -l hdoloecs 27rf-l )y9 j+g7nt. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It trav*ltg-pzbs a e.ma2q/, els 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. Thit2 *a.s az/,p-qmeg lbs trip takes 45 min. What was the bear's average velocity?

  You are driving home on a we2cva( 3j- qiw a7r2hz-)iwfvvekend 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 anz2v jfv7ia- 3iw r)-hwqa2 vc(d 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 36-/19gcmm zgnwh8iaa(veqxkm at 100 km/h. What is the average speed of the motorist for this trip?w a-mx31ce ( han 6qz89ig/vgm

  A motorist travels for 3.0 c);c5,pkcun y4h+ecb,g* gsyh at 80 km/h and 2.0 h at 100 km/h. What is her average+nb4hy,upey cg cs)c 5,*cgk ; speed for the trip?

  An airplane travels at r(iei)dw0mdr q l/u*(300 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. What i mqe/w0 dl*i( diu)(rrs the average speed for the trip?

  In a 400-m relay race the anchormazzh ,) k5,).tqpo xijzn (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. Wh,z.5 )i )p zk,ztjxqhoat 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 andmh su1zzs + 3e.)n nths6k*5ji comes to a stop after 10 s. The car's average velocity during deceleration was 49 km/h. Wj5hzen+1muk).nh3 si 6tszs *hat was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, vrggbt;n . 6v- ww7+61iskh ncat the average rate of i wr k- ggnwhvt6v71sn+c;6 .b$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h acceleratestisr746k nm / jivtm/8 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 rz y g;qhdiqvp01r uy 6y3n1//nest and accelerates 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. .p)7(ehv r7i0fqmuus dr(lc3 - gumt5It then speeds up with a constant acceleration omuc(umgsu0 fi rt)5e (.p 3qldr-h7v7f $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 2.3tt*qfan,muycai.y8 6,lp1l m46 ay 9q m/s experiences a constant acceleration of,tliplu9fy ,* a a6qn.cy y1q6a8tm4m $4.5 \; m/s^2$. What is the cart's displacement during the first 6.1 s of its motion?

  A bullet moving horizontally to t(f;jb+fhhp7px. m/ti .zl 0 jahe right (+x direction) with a speed of 227 m/s strikes a sandbag and penetrates a distance of 94.61 cm. What is the avepjxj;b+.t hl0/fa m hpz(i.7f rage acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched fro:dlg tc69u2pg m a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the accelp6 9 gd2tlcgu:eration is constant, what is the length of the catapult?

  A car starting from rest moves with constant accelerati 5fknl7bf1c(ion 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 200 m. What is its averazyq5fgzi0z),ey2r )g .a*tylge accele,2y )*yzyzzrq l0 5gteg)i a.fration?

  An object starts from rest and u .udnu2jvd75ug.h a;nndergoes uniform acceleration. During the first second it travels 3.5 m. How far will it travelnjv na2.hu5d ;u7du.g during the third second?

  An object is moving in a straight line with constant acceleration. Init72j+bvhh n2- kfmx3sx ially it is traveling at 16f-3sxhkh2nj v xm7b2 + m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and acceley(y f8* ;efczrl7q bea/ vy,g60 d,hiurates 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 decelerate at aky 980qi )igt iooj.bi7:a9n dg /ar:mbout $5.0 \; m/s^2$ 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 carp)k7,,nasanr23 ir v q that has been waiting at the intersection starts ahead with a cova k7r,pr)a2nqs n,3 instant 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 2 nax wj ml fzk1 vf2..kh9r8:g+bch5rthe surface of planet X where the accelerati+k 25hv zgl b x.nam1khw8 r.fr:cj92fon due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward wa4 uo1,r fix:p 56veagith a speed of 12 m/s on the surface of planet X where the acceleratio6avf5 4:agu1 pr xeo,in 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 surface of planet X wjxhr0 pgtvr c;-00 8z z6m-gqkhere the acceleration due 0qk8rzv 0j0hx6m t;--crzpggto 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 re b4zusa6k ( -2lv3snupward with a speed of 14 m/s on the surface of planet X where the accel6bnre kl2 vs-sz( 4au3eration 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 gronff rrn92y eei/9)v*eater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warniynfee 9ri vr)on f/*92ng, 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 itbjn.4rrh8 lu)j)yfl1 s velocity after 3.00 s) l1r4 bj)lfnjurh.8y?

  A bullet shot straight up returns tocf:v5194 b oe k:vhwnt its starting point in 12 s. What is the initial sfw5bov91 vhet4k n :c:peed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does5s9k pi4axs) om/z4lw it take to return to its starting point4m)ak x/w4s5slz o9pi?

  A ball is thrown downward from the te 3dwzqz d yl519.2jbiop of a building with an initial speed of 27 m/s. It swq 1 9 5ebd2dyjzi3.zltrikes the ground after 5.8 s. How high is the building?

  A ball is thrown straight up with a speedlp- :8 xvsvkv6 of 30 m/s. (only fill in numerical value in the b: slv6v8k- pvxlanks)
(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 ozm(7ame l+x - 43l2rwf9qq2- h zzusqinto the air with a speed of 24.9 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 2 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 f+2kak rfl8p5;srg6y at t = 1.0 s?

  In Fig. below, what is the velocity a.4dr bd:j )sifeb cc8;yq 0n0akgsh+,t t = 2.5 s?

  In Fig. below, what is thq:pp,u nw d4)3ret p4b)np:the velocity at t = 4.0 s?

  In Fig. below, what is the velocity at t = 5.)j)cp1ihp.1a uabe h 15 s?

  In Fig. below, what is the average velocity f z- ygauk )je)7w0+ityrom 0 to 4.0 s?

  In Fig. below, what is the average velocityk n )4jk7qe7 c/7jbk8/tehybu from 0 to 6.0 s?

  In Fig. below, what is the 3n.gm22-sb h0w cqe6nrvbd(xp 6n0qg acceleration at 1.0 s?

  In Fig. below, what is the a8tx.w4n we+qq cceleration at 3.0 s?

  In Fig. below, what is the avezno ur ip(749rf g:a4rrage acceleration from 0 to 5.0 s?

  In Fig. below, what is th 5g8jk,f8/ co1zcqalz e average acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 jt/fahfrq 2/ (to 8.0 s?

Does a car speedometer measure speed, veloc6-h n/e3cpq7.ve d yr+9 qte( mjdaae.ity? {speed|velocity}

  An object can have a varyingypy4cvqi5fn: x x6.;a speed if its velocity is constant.

  The velocity of an object can be negative when its acc0ju g-b auxm.drfr /n7v t(-t cdn9-g-eleration is positive.

  If one object has a greater speed than a second objb ;nne7)i8 3sige5+,iid ymfoxm 3dh,ect, the first must have a greateb dhog,de 8)m;xsyi7 3nf e +5,inii3mr acceleration.

  Two cars emerge side by side from a tunnel. Car A is traveling with a spei l3;f9zyib8 ned 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 it)u/7dn o7 kjzxuu,*yt7o+fp ts acceleration decreases.

  A baseball player hits a foul ba6:( wh(p lbiwr)u;mk eog* ,qhll straight up into the air. It leaves the bat witheu)( gpkm:ibw6hor ; l*w,(h q 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 acceleration,x3 x+iyo9 iyy+ how does it change if air friy yyixo x9++3iction is ignored?

  As a freely falling object speeds up, what is happening to il avto)fwx0cajq, ;.iur7: 5pts acceleration, how does i;:jq iuafo. pv)5w xt7cr,0l at change if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its ez zoeg3c9f 9jp+a)t-original position with the same speed as it had initially if air resistae -aejg) fco9tz+p9 z3nce is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero accelerationun,/xdw + (smw at the same time.

  An object can have nonzero velocity and zero acceleration at the sam ht vf5fb6- h935ltlsvv 3bogct53irc t3n4s5e time.

  An elevator moving from the second floorj u9c. i*e(k x;938dki zto,3c y5q4auafh msk to the fifth floor making no stops along the way has zza( cjo5i d9 ;xkfmsiq*kau34,e h 8cy.39u ktero acceleration all the time.

  A rolling ball moves 1ph. 5dvsio)h4mi+d efrom $x_1=2.0 \mathrm{~cm}$ to $x_2=-5.4 \mathrm{~cm}$ during the time from $t_1=0.9 \mathrm{~s}$ to $t_2=5.2 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.9 \mathrm{~s}$ is at $x_1=2.9 \mathrm{~cm}$ and at $t_2=3.2 \mathrm{~s}$ is at $x_2=7.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a qqu20c )gdb8a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 6.0 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 88 m as*uz7oa b1ls ;way in 12.6 s. It then turns abruptly and gallops halfway back in 4.5 s. Calculate (a) its averubz;lo s*1s a7age 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 froj te u(q.hy 3l(toj5h8l6g :ajm $11 \; m/s$ to $22 \; m/s$ in 4.9 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 a/,rz mbwz.o t7b7jz ,$22 \; m/s$ to rest in a distance of 82 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed of;8eapk fu o6-/n wmaec :ky4.h $33 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.0 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially top speed abou pjws-* x+nnw-m zh2z9y7 k0sys9go7 2pvbk,xkobs9 ywns -zph07wgz*x,vsn9 xyp2kj7 2 +m-t $11.2 \; m/s$ in the first 14.1 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 cibrb1 n/sp/+a speed of $15 \; m/s$ to rest in 5.42 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop,t;*z 9. edsnyxthgs8y-wi,l . a car leaves skid marks 92 m long on the highway. Assuming a decelhl9-xy.,n ewts;.i8t*s d yzg eration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck gh64 bfx z7ye;eoing $25 \; m/s$ 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 kclm 4vc y yiw(j 9,10gas:za4run in less than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner must then aays,cjwm4zl( gkiav1:y 4c9 0ccelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$