Suppose that an object travels from one point in space to another. M*om3s(f d vp2xake a comparison between the dis 3*o2f (vdxpmsplacement and the distance traveled.

  When is the average velocity of an object equal to the idiv0dhs+ w65 pnstantaneous velocity?

  A new car manufacturer advertiset7yzhb/myb 63 7ssif: s that their car can go "from zero to sixty in 8 s". This6s: ys77/t 3him bzbyf is a description of

  An object moving in the +x axis experiences an acceleration of m9 a kpuqrm8 aktw:2)-$2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling*carlv s * yzrsp.nd-hy )+8p2(houn9 to the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concernin8p yny*l adh 2)9*soshru(. +rvzp-cng its acceleration.

  Suppose that a car traveling to the West (-x direction) begifxmzr:j8dp 0n 7zd qlse73p4d s-6 ba6pn8ax)ns to slow down as it approaches a traffic light. Make a statement7:d 4ms0 8zdnpnb6xpzjf7 qa6a d-)xp3ler 8s concerning its acceleration.

  Suppose that an object is moving with a clt+gh-ni5fx.ofn1:r( wk ov9 onstant velocity. Make a statement concerning it1-r+l.n9i5h vxnotgwk ( off:s acceleration.

  If the velocity of an object is zero, does it mean that the acceleratiow2o s.hww.2,:q;f ldo) axcdsn is zero? Support your answer ).shlofdc w2.wqx o2w; s:a,dwith an example.

  Can an object's velocity change dix6 w2 5kctoi3n4bqec5*pir.hrection when its acceleration is constant? Support your answer with an .roip* b2cn5k4ehq 3 5wixc t6example.

  Suppose that an object i3tq */rhc s8ol 2tfkoq,q+hn,s moving with constant acceleration. Make a statement concerning its motion with respects fo8k, 32h rhqlc*t,tnq /q+o to time.

  Can an object have increasing speed while its acceleration is decreasing? Suwhi:s 414vpbl pport y4vpiw :bls4h1our answer with an example.

  Suppose a can, after an jmyvmo(nc f xt788 i/co+d o95initial kick, moves up along a smooth hill of ice. Make a statement concerning its accomyvtcjixn8m /c7o 5+d8( 9fo eleration.

  Under what condition is average velocity equal to the average of the obj*;hsp j*w6xt fm0t (kb1o5hfr od4nc,ect's initial and final veloc1* fd*,ftso4o5(n 0b k;cxrwh6 jpmhtity?

  Objects A and B both start at rest. They both accelerate at the samecywdm6 bh28 mn 4hbl fq)7 2vpy8:,nwu rate. However, object nyfmvhd uwbq n88)lhp mc:w,b2642y7 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/tjyl+-vr s7i 2ojl 6v same rate. However, object A accelerates for twice the time as object B. What is the dis ljtov7-/6i2+js r ylvtance traveled by object A compared to that of object B?

  When an object is released from rest and falls in the abgl c6 *0x9mayusence of friction, which of the followingc*xmy gal6u 90 is true concerning its motion?

  When an object is released from rest ar-y,z-nxpxch;( t+ktrx0m 0 pnd falls in the absence of friction, which of the following is true concerning its moti x,rnt;x h-c0rm0kt-pz (+x pyon?

  Suppose a ball is thrown straight up. Make a statemeksni9/co ;es 8nt about the velocity and the acceleratksn/io 8s;9e cion when the ball reaches the highest point.

  Suppose a ball is thrown straight z i*g:dhyy/y+ i- wxz8up. What is its acceleration just before it reh * zwiy/g-i y:dx+y8zaches its highest point?

  Suppose a ball is thrown straight uue0 -wa s*qih8l bp(,s+vu/m i *)ejzzp, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and accelera *-)8qzi s/0lie w+zu( pa,msvuj*bhetion as the ball is going up.

  A ball is thrown straight up, reache4o26j ; tgpd2rq4wag vs a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as th 2;patdw6o 4gvq2jg4 re ball is coming down.

  Suppose a ball is thrown downward in the absenca(c7nx6foyg z d:o 3p w6;vk:ae of air resistance. Make a statement concerning its a:vck6 xan(g7a: f3;ywpz6o od cceleration.

  Suppose a skydiver jumps from a high-flbeo:b 6gnd- /j7n m7sne)pz -iying plane. What is her acceleration when she she reaches terminadse/-:igzb nn e6on7-)7 mbjpl velocity?

  A ball is thrown vertically upward with ae +jis r*jnp0. 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 goi.renjps0* +j than the first ball?)

  Ball A is dropped froi07yf3b/w cd (+ bfvmv4az3 hkm the top of a building. One second later, ball B is dropped from the same building. As time progrebd f/04h3v zv7 yi(cwab3fk +msses, the distance between them

  Ball A is dropped from the top of a building. One second later, ball B is dr7zk px;g m9hmpucb+d6g/z53l opped from the same building. As time progresses, the difference in the+7zphc lm6; ggx9/b3 upz5dmkir speeds

  Two objects are thrown from the top ch jm6*p50 b j7wlone/pz-,dhof a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when nhc-w 70jeod z/5l,6 *hbpmpjthey hit the street?

  A brick is dropped from the top of a bud90 szqyd *.zuu48 z f7kjuya6ilding. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the ac z f0*a 48s6jz7.9qzuuyyukd dcelerations of the two bricks.

  An object is moving with constant non-zero vehq (ei105v2 sud(or0 7 tlvdoelocity in the +x axis. The position versus time graph of this objeedv(voq0 5o(d02url 17sehi tct is

  An object is moving with constant non-zero acceleration in the +x axis. Thm qar;d 9da 87p6otx*nc4 o,uue position versd 74dm,* oq86 pa;otruuax9cnus time graph of this object is

  An object is moving with constant non-zero j2 i4vg7p7jxf velocity in the +x axis. The velocity versus time graph 7p x7g42vijfjof this object is

  An object is moving with constant non-zero acceleration in the +x b w7c0rg7+-aj3yflc4t6mr v kaxis. The velocity versus time graph of thisgjlwak3+b 4 ry0ct76-vm c7 fr object is

  The slope of a position versus time graphg3,b/ h:a8ql mcm wwm( gives

  The slope of a velocity versus time graph gi+ sn5eih 06n h*zhn0lxves

  The area under a curve in an acceleration versus time gr0 p vukq/ jnbe9r,et07aph gives

  The area under a curve in a velocity versus time graph g/(mbu1rog+e6j s0cc:kg 2p re ives

  If the position versus time graph of abulv;ku .(k(o n*fv djw vjdfe,s *1/5n object is a horizontal line, the object i/ f.* (,; jkdvbw sdunevvjo1ul* kf(5s

  If the position versus time graph of an object is a vydzu5vi(o.th 7jx37liaw)1 hertical line, the object is 7x) i5wauld3.j(o z7hv1ithy

  If the velocity versus time graph of an wc(cxrxgjd +7.g8m t1object is a horizontal line, the object xj8 tc.+xr1c w7(mggdis

  If the velocity versus time graph of an object is a straight line :6j /xfik oektm,po ed rj-7h9j25- eamaking an angle fjrokejp hd 5j,i-k279moe x:6t ea-/of 30 degrees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m se327lvn1 ov wtng-1hsouth. Find both the distance traveled and the m1v -12n otlw hvs73ngeagnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long will iqxnb 196puk .kt take to move 12 km upstream in pk u19xbk q.6na river flowing 6.0 km/h?

  55 mi/h is how many m/ss, + m.2 ordfja-5t uprunv h3bpy2+93wrv6 pg? (1 mi = 1609 m)

  What must be your average speed in order to travel 350 ttvl. kt/7b 6dkm in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 5l;awhc*k8x x 17 min. What is the average speed of tl;kw*c 1 8xxhahe runner in m/s?

  A car travels 90 km/h. How long does it take for it to s0r )ms krf29etravel 400 km?

  A ly (light year) is the distance that light travels in one year. ) 9tef 71c/wy)qg brcdh+a*tnym9.ip The speed of light isg/haiypmcbt)d n+.ft79 q) ce*1 y9wr $3.00 \times 10^8 \; m/s$. How many miles are there in a light year? (1 mi = 1609 m, 1 yr = 365 d.)

  If you are driving 72 km/h otbk. .6 7a7rhrh no9aalong a straight road and you look to the side for 4.6..a9rbo ah r tkhno770 s, how far do you travel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 10s j+qh3pm im7a5 d 1sixh,4j/x0 s, your average veloi/3hsdqm5 1 mxjj7p xah4s +,icity is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0*jo( 2tx lpdq0 km east, then 1.0 km north, thetj2x opdl*(0qn 1.0 km west to 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 travels 1.0 km so/xj2+vpj nbb+ uth, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takejxp+nv j+2b /bs 45 min. What was the bear's average velocity?

  You are driving home on a weekend from school at 55 mi/h for + /;phd g md*0m khgpd)vm/ g7og0jnw-110 miles. It then starts to snow and you slow to 35 mi/h. g/g-jg+ ogppdwm;m/0m*v)0 dhd7 hk nYou 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 pa .3nhem4-cyym hj61160 km at 100 km/h. What is the average sm3j1 my4h .a-6p yhecnpeed of the motorist for this trip?

  A motorist travels f .7u+nk;fug sto 77*h8eaddeior 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her average speed for the .n sh7uetiofae*d g8kdu77+; trip?

  An airplane travels at 300 mi/h south fo dho8jj uj,beqt(kpmi9 q8-u :5xkly7dkv0 )7r 2.00 h and then at 250 mi/h north for i8 d 80k9xdu h)q me:j voqkkp5bj7-u7,j(lyt750 miles. What is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 100 m) fo(id9+ wxb,6vixi-jpur 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, in order that the team A runner not lose the rax-b xij,upv d9+6(wiice?

  A car decelerates uniformly and comes to a stop after 9 s. Themoho 1i3gg ;s7 car's average velocity during dece3 m7gh;og1 isoleration was 79 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/ xb7hsgv)alw 7) h:hz5ie t*i,s, at the average rate of ) v)z*x7asi, bh 75igwet:hlh$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h av-7*wu.f 1ydzn*l r( s/whnogccelerates 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 c:ug / c0poy y-8fs3l:43smc5krvyq u$4.0 \; m/s^2$ 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;:hpj e(ykk1 1e ofb,f for 10 s. It then speeds up with a constant acceleration of 1(:eekbof 1f,; ky hpj$2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 3.2 m/s experiences a constant acceleratio*.g .4mexrdtg n ofd . g4xrg.*emt $1.5 \; m/s^2$. What is the cart's displacement during the first 8.8 s of its motion?

  A bullet moving horizontally to the right (+x dir/*afmelg2, qqection) with a speed of 447 m/s strikes a sandbag and penetrates a distance of 38.09 cm. What is the average acceleration, in gf qlq,* ema2/$m/s^2$, of the bullet?

  A jet fighter plane is launched from a xz c-a9 dwmer4 e0gt 9.y+vwh+catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and vew9w.0m 4x g-+9hdzcatre y+ this requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest move2w1n 0 /q(csf a /ehhcjsel3hs( n*ml8s 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 distance of 200 m. What is iaxl m,i2xgds- +maa03ts average accelerationdxsmgaial3,-0 2m+ ax?

  An object starts from rest and undergoes 3 ke 8zekw;yqvle)(*uuniform acceleration. During the first second it travels 5.5 m. How far w*)k3 evew 8z u;lyq(keill it travel during the third second?

  An object is moving in a straight line with constantz;plo)g/7 jyts9u) di acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does itgi uyz)9d/p;o7j tl s) move during this time?

  A car starts from rest and accelerates uniform7dgp+s,(sha aly 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 d : k*hd*ecexx( 8pwgz*6yd9vwry 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 turns green, a car thatj y4mc-evl5m3 +eqxr5 z3a sa4 has been waiting at the intersection starts ahead with a constant accelera5c q+4m 3ex4zyjaale 3vs5m-rtion 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 of rna9q ty,t2s.3 c/v jpplanet X where the accelerat traq2 cs. y/93tpnj,vion 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 the surface of plane3h cr3v-i7lyy40jq wx t X where the q0yi v37j43lyw-c hrx 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 surface of plak/io m3u8d/ 0zifswjkj)0vo k0 z5r3tnet X where the accele/)r dv0z5k3z0 so/ifjmi0 tuw8kk3ojration 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 upwa cd-ysq+n.rf5rd with a speed of 14 m/s on the surface of planet X where the acceleration due to gravit +q5yrd.sc fn-y is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usueb.nckma8 7ps:y2t7sally greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fallp 8y s:e sbn.7tkm2c7a before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. What is its velocity a. us)s-m2uymc fter 3.usy.us m 2c)-m00 s?

  A bullet shot straight up returns to its *k6 myyry )l9)fh1sa5ozb fm3ir4tb, starting point in 7 s. What is the initial speed of f ya*)syl3obbih4zy 1frrt 6k,mm9)5the bullet?

  A ball is thrown straight up with a x is x.+5k6i qs1-jq 3.jkhtiospeed of 36.0 m/s. How long does it take to ret jk +kx i16qx3ot5.shiqj-.isurn to its starting point?

  A ball is thrown downward from the top of a building ,yehlj j-sew9 quk,:v*tk: zj ,n9ai 2with an initial speed of 24 m/s. It strikes the grlevs *,ayjiwh, :kun,z9jt q -kj:e29 ound after 5.1 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only h0.pqfn/9.ksc (9o6 ilhytl nfill in numerical value in the bliklo 6p (q0sh9. hcyltn 9/fn.anks)
(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 az6+he6-e(nk/bd5j dy3sinv5 jc -amk speed of 32.0 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 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 iiy s + q13bgnkn8*t)nfs the velocity at t = 1.0 s?

  In Fig. below, what is the velocity al*se a))+s;iap 6gn(( zfqpumt t = 2.5 s?

  In Fig. below, what is the3lie(y e w76jt velocity at t = 4.0 s?

  In Fig. below, what ishx5u l1h:p7u h the velocity at t = 5.5 s?

  In Fig. below, what is thgumy9:g3oy 9yv9 dqua b .:w8ve average velocity from 0 to 4.0 s?

  In Fig. below, what is th,im 5 w8hyqooxm8 qf.n27pj7d e average velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration at 1.0 s?vp13 5db/pw uups 1 dpuq.*dc-lyhz-(

  In Fig. below, what is the accelerat18 wzwnn-u3m8m+uc4 nh7uqy q du9le 7ion at 3.0 s?

  In Fig. below, what is the avera+)ux(*5 mthza((fw8sc l s sqzge acceleration from 0 to 5.0 s?

  In Fig. below, what is the averagq6 l70b zq,cvckj.e 1ke acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 tom qa8uxc6(q7 .c3u eiv 8.0 s?

Does a car speedometer measure speed, velzzm( wh*6-v(2lgw i8mrodv w jnt3w(6ocity? {speed|velocity}

  An object can have a v(,6iu)6os w4bfdfeg varying speed if its velocity is constant.

  The velocity of an object can be negative when its acceleration ahwth6963ud iqjm i:d:1mbdvd i94 2fis positive.

  If one object has a greater speed than a second object, the first must have a gqdh0 4tq.swc z)h/+as3ghup xv y(y;5re3)xav . w+ pqg5cz0d4(q; y/hhs yhustater acceleration.

  Two cars emerge side by side from a tunnel. Car A: nd8p(zrn,n x4 oe+po 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 incregkpquv3doz ynm+ s58 ev)/c1, jqy/p/asing in speed as its acceleration decreases.

  A baseball player hits a s mtj6:ya/ds , zo:px+foul ball straight up into the air. It leaves the bat wi6 p:+td osmy:zx,/sjath 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 objeld7t3; jzn ,,g0asf:piqf)bl ct speeds up, what is happening to its acceleration, how does it change if air frict 0j:3n)ldfla, i7 ftzbgs,pq ;ion is ignored?

  As a freely falling object speeds up, what is happening to its acceleration, -2(sc /twxyy3h+ )einot nnm*how does it change if air frin n- e*(tyycnms/+2wh o)i3x tction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its originav wmykx5/i5dly, 0d (il position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this result be altereddy(kl5xw 5ivim/ ,y 0d?

  An object can have zero velocity and nonzero accebg4 g3jg5f7cd leration at the same time.

  An object can have nonzero velocity and zo .aj+ylhwxe15bvr.5 ero acceleration at the same time.

  An elevator moving from the 6/e3*g m1r tl+gbhynfkw 92wxsecond floor to the fifth floor making no stops along the way has zero acceleration all the tilhytgx9g / rw3w*6bek+fn 21mme.

  A rolling ball moves frolkkc96v o-pa:+ btw 0om $x_1=3.0 \mathrm{~cm}$ to $x_2=-6.0 \mathrm{~cm}$ during the time from $t_1=1.7 \mathrm{~s}$ to $t_2=5.8 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.7 \mathrm{~s}$ is at $x_1=2.9 \mathrm{~cm}$ and at $t_2=4.2 \mathrm{~s}$ is at $x_2=8.1 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps ar a 03gq 0xfn3g+s)mxsvound a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 11.2 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 st: nc cw, bws;/7so/nt)p33k kmrhuc. araight line, moving 99 m away in 13.3 s. It then turns abruptly and gallops halfway back in 4.7 s. Calculate (;wpwc.s /haks:3kou,7 )ctr mcnn 3/ba) 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 fro*vi noo us *hsn:79oltdc-7v) m $11 \; m/s$ 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 from g/zf i/ks7mn :gu/fn-$23 \; m/s$ to rest in a distance of 59 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a sa gpgwy;)/ k+epeed of $25 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $3.0 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocksb: pd96ooytorh7; g2p to essentially top speed about9 b6ry7o; 2o:dgpothp $10.2 \; m/s$ in the first 14.8 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 uniformly from a w.x4 coiehx. 8iz1-6m)u kk .r*lxqcjspeed of $18 \; m/s$ to rest in 5.27 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaks0*/x6w t tiuves skid marks 92 m long on the highway. Assuming a dec /tw0s*xit6 kueleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck gobw/w oq;h id 3x, (p*u;yv5gzoing $25 \; m/s$ 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).    $m$