Suppose that an object travels from one point in space to a2gzc khe k30 *4as9ep;)ztewm nother. Make a comparison between the displacement and the di0 cew *zg3) 4ekmakhs pt;ez29stance traveled.

  When is the average velocity of an object equal to the instantaneo7bo;u wo3fw8m c60vb q0a. edqus velocity?

  A new car manufacturer advertises that their car can go "from zero to si3.d ,f wlzjs4r.t -ssgxty in 8 s". This itr.sdgs - zl,j 3fs4w.s a description of

  An object moving in thav*)gvng +edzf 4 / (bxo5o0uke +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) begins to ; :i:gu,p: wtxff4nbj y hg,b.slow down as it approaches a traffic light. Make a statement concerningibu tpjw:g4,,:bghnxy:ff; . its acceleration.

  Suppose that a car traveling to the Wrw99sv4vmn(12n oegrn :gi ;twkv74xa(q a j (est (-x direction) begins to slow down as it approachesa 4:msnwj qvoa 17vi2 n(;nw(re(xtgr9gvk 49 a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make a statement com *hpc l;fthnr /bkm2h: io./.ncerning ifrk ; hni* m/.bpm/h.oth2c l:ts acceleration.

  If the velocity of an object ixng6h+ :ysc1c s zero, does it mean that the acceleration is zero? Suppor n6yc1hx :c+sgt your answer with an example.

  Can an object's velocity change direction when its accer ; 6z0d,vznnzn,c r 5*u,dmybleration is constant? Support your answer with an n*,5,0zy , cnzr rdvm du6n;zbexample.

  Suppose that an object is moving with constant 7ydyivy56p .f acceleration. Make a statement concerning its motion wi. 5p dy7viy6fyth respect to time.

  Can an object have increasing speed while its acceleration is deq8pk5p q x f2 mw 0rm.u1py4.i1nsoax(creasing? Support your answer x q0(mompf 2n1.41pk8 s5.wr pxqayiuwith an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice. Makeaj ojaec 7 uqg6q(5o1x8f9u kdic:)(e a5aoa )gi(1cjufq jc(x :u87k 6q9 oede statement concerning its acceleration.

  Under what condition ij0-o.l (pdhats average velocity equal to the average of the object's inid(lj 0 topha.-tial and final velocity?

  Objects A and B both start at rest. They both acce truv*wsy 7y4rhhoz39sr 5lm-+jhe *, lerate at the same rate. However, object A accelerates for twice the time as object B. Whaujzmh*oh*-ey53r 4v9s wry7sr+, ht lt 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 rat i 5eg*io;he7ve. However, object A accelerates for twice the time as object B. What is the distance traveled by object A comph7i;v gee *o5iared to that of object B?

  When an object is released from rest and falls in the absence of bpkr.t l;6 hz+friction, which of the following is true concerning its zph+t6lrbk.; motion?

  When an object is releax +8x:lqpshsrodc( + 7sed from rest and falls in the absence of friction, which of thpor+ xcq:7(+8shl dx se following is true concerning its motion?

  Suppose a ball is thrown straight up. Make a1vy06x ccbw77m vv /o0)ey zdj statement about the velocity and the accel 17yxc)jv 6/vbdce0m0v o7 ywzeration when the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration just befovvs+hrg khuf7 rryz*j 6e9vf:-:8y8q re it re8rvq szuvyrfg8v: y k: 6-+9f*7her jhaches its highest point?

  Suppose a ball is thrown straight up,6gq -(bps ksx* reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration ass (pk6 b-q*xsg the ball is going up.

  A ball is thrown stral-ol uuc.w7zqp; yr ,2ight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is comi u72y,w.u -q zoll;cprng down.

  Suppose a ball is thrown downward in the absence of air resistance. Make a state: fn-rt0)-ls zl79vz xq4anr kment concerning its acceleratizna 4:9x-0vklr-s l)nqtr 7fzon.

  Suppose a skydiver jumps from a higpdw4e m -*anx1h-flying plane. What is her acceleration when she shee1mdax 4wnp *- reaches terminal velocity?

  A ball is thrown verticalj b/ (krs-aomw;-t br rx sp6v65b4t8lly upward with 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 46-r k5tmvrxw(sr;a jb 8o/t-sb lpb 6does the second ball go than the first ball?)

  Ball A is dropped from thhknd(83t9be lt b/n-qe top of a building. One second later, ball B is dropped from the same building. As time - /(n8dqt9bt3 ln kbheprogresses, the distance between them

  Ball A is dropped from the top of a building. bdmngu;0*s 9 dOne second later, ball B is dropped from the samen 9msb*d u;0gd building. As time progresses, the difference in their speeds

  Two objects are thrown from th 2.mqxnz* s88e f7x)kj k4p o/*ngejdpe top of a tall building. One is thrown up, and the other is thrown down, both with the samj/n 8kgkd) 8 4eq.s *zoe72mpxf jn*pxe initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick is thrown st e-sr1m2sd yk k57/mm)fyl+x hraight down from thy7re f1y )/l mmk2h5k+sx -dmse same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with p8ip4u8v1zpcjn x l* )constant non-zero velocity in the +x axis. The position versus time graph of thi *) nluvjpz81 ic84xpps object is

  An object is moving with constant non-zero accelerathy gx e8v),kh ;umob3a2oms-1ion in the +x axis. The position versus time graph of this o1xyso8- mkbh32,g)eo; h uvma bject is

  An object is moving with constant non-zero velocity in the +x ax + 1w)dl5c*wx3 fbxcv tduz/;uis. The velocity versus time grapht/vu *xd)x zwbcfdc+513; w ul of this object is

  An object is moving with constant non-zero accele o98io)g cduyob//6 wkration in the +x axis. The velocity ve9o/k 8wc6dgo )ouby i/rsus time graph of this object is

  The slope of a position versuwug5s7x;1 ny ht*ytvq*8x 6srs time graph gives

  The slope of a velocity ve qi.rodfvpk/ /cy; /u *of*o9ersus time graph gives

  The area under a curve in an accelerati-n94-w 0jbv ahm2 anw0cbs0uk on versus time graph gives

  The area under a curve in al(xtfq p(3xe*6mmqb n5 ) 3ewa velocity versus time graph gives

  If the position versus time graph of an object is a9)e gjmu1ztf/ horizontal line, the object ijt9/ ez)ugf 1ms

  If the position versus time graph20wsas s(l mu m70ew 9py )i+)gh:ipd :v5vdqt of an object is a vertical line, the object iswq is:vghsu0)0dpel5 d(sy 29wi : p)t mva+m7

  If the velocity versus t) a q)rbtc njxy,u5g0-ee*9lpime graph of an object is a horizontal line, the object isj ,eay*ec-t95nq l) p0ug)bx r

  If the velocity versus time graph of an object is a straight line makingmfbr aa0hm+ /t-8+p2clagio ) an angle of 30 degrees with the time axis, theoc+8 /fr+lht) 2 a-pi0mmgba a object is

  An object moves 15.0 m north and then 11.0 m south. Fuq:koc/t1 kj:ind both the distance traveled and the magnitude of the displacement / jkk:cquto:1 vector.

  A boat can move at 30 km/h in still water. How long will it take to move 1btaih6-o2 wpa04 l u3i2 km upstream in a river fl2 hiaaip 3-6ow4bu0lt owing 6.0 km/h?

  55 mi/h is how many m/s? (1 myqemcxz 065),q y(tb vi = 1609 m)

  What must be your average speed in order to travel 350 km i/ 7r.i,9e *xbw- llejkc7swdon 5.15 h?

  A runner ran the marathon (approximately 42.0 km) inw,m :.x yat0ue 2 hours and 57 min. What is the average speed of the runn,u .:a0xmtwy eer in m/s?

  A car travels 90 km/h. How long does it take for it to.(jjuao l jq;9*z/vfo travel 400 km?

  A ly (light year) is the distance that light trav wn.iiys2xs) e.6 ma)gels in one year. The speed of light isnxsme.).62i ay )w sgi $3.00 \times 10^8 \; m/s$. 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 loobp2 u0 c-hai671.qvdxmo0gimk to the side for 4.0 s,2xqhmgpu0m0a 76 .iod 1ibc- v how far do you travel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, your averax.7qqz gs0do8zhm -7j ge v qg 70hx8zm-o.qd7 szjelocity is

  A polar bear starts at the North Pole. It travels 1.0 km southn5(o r (sfqr5la2 bpy,, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip take (r5orsfn2b ,5(qy alps 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It t8g7-mhq faii-i /qa+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. ig at7/-f 8-iha+mqqi 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. Iq9, t+gxvgr jm: 71fvat then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is y+jg7 q,rv:ft 1agmv9x our hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. Wep n/t1f/(y,i5ldp rd hat is the average sp ip(,re5nfl/ d/tpy1deed of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/kj-gk-aya f57 t ji1/nh. What is her avera5 -aki-1af kjyn7/tjg ge speed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/ht pg urs480v nsxy7ce82i/s*o north for 750 miles. What is the e82 cvr0ipo* yss/x48tg sn7uaverage speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 10,v2 :k6, on:ndpuw 1 u2tgticy0 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 teuwpv2:t:u,k n d6 ,1ictnyo2g am 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 and comes to a stop after 14 s. The car's averhs sm/l:g)5j hage velocity during deceleratio sjh5lg h)ms/:n was 65 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, ad ;zcvx6 dd ;5-vumj,mt the average rate of ,m6;uv ;m- dvjdx5cdz$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates a gic/neih 7v((m3hj ,ft 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 r)z-quk5fi )kyjg-z 4 yest 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. It then speeds up with a constant acce-bgps nz v+v)kcalwh )4k;7 m8leration of 4- mhzk )nsklbg)c7 8v +av;wp$2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 3.7 m/s experiences a constas7wbrig(1bl, xld-*pnt acceleration of 17(gw -i,*xrbs bdll p$4.9 \; m/s^2$. What is the cart's displacement during the first 7.0 s of its motion?

  A bullet moving horiz,u92z)yr+ bc xfbmke c:vo)7aontally to the right (+x direction) with a speed of 551 m/s strikes a sandbag and penetrates a distance of 87.54 cm. What is thb 2uaf:b,co9rzv mk)e cy7+x)e average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carjau 4yd, pi6km/)t / (y+wijxwrier. It 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 caj/)dm+w/yji ,4 wa6p xuty k(itapult?

  A car starting from rest moves with constant acc . hi4)f2lddfs) aaxbb lfoo+c38n.jx4y2w:beleration 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 i+, d nx0 3*tbhc6pewxo y1w1vvts average accev tx,h6ep1+3 owxcdn1yw b*0vleration?

  An object starts from res jq6;igct,z.yxov (v6 t and undergoes uniform acceleration. During the first second it travels 10.0 m. How far wi ;zx6,jtog. (y vqvc6ill it travel during the third second?

  An object is moving in a straight line with constaax-af.q4;z mu nt acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during thism ; x.za4faqu- time?

  A car starts from rest and accelerates uniformrckpqh9x/.v, a c7jr1ly 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 *sy1k)mmv 3/izczfl.o75yyi 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 :m)1ya pr 5zo7+ok qtlturns green, a car that has been waiting at the iyz:ort+lqom)p 57a 1k ntersection starts ahead with a constant 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+sr7kd .*f +bxm p7 xxzo*lb2i/s on the surface of planet X where the acceleration db7 2.ms xd+f7br+lx*xp ki*zo ue 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 planet 904wuvet ifu9ab:jv +X where the acceleration dvt9b :9wvj0+ aeuif 4uue 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 2p b-o.kdv3 nszi8r 8xof planet X where the acceleration due to gravity sodpkix znrvb882. 3-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 of plantj.o jm qa(kf7:x -g(oet X wherqjtg:a .(foom7 -jxk( 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 greater than 0.10 s. If your friend holds a rub4 cgtx( gic.s939c)ir2ddpo yhv430v0x gq j ler between your fibi 9r2.j(3g9 gxig)dx04dy c ts 0 h4oc3pcqvvngers and releases it without warning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward aj+y e q6o:v+-evfr ( 09odnkekt a velocity of 19.6 m/s. What is its velocity after 3.00 sjo-f+e 0n eo(edkv+qk:ry6v9?

  A bullet shot straight up returnrew .(o r),eam .ftq/ul3+hq ns to its starting point in 12 s. What is the initial, (3 ftneu.wa.lo+hqerrq )/m speed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does itab2li 0fp nq.( take to retfn.l (0b2paiqurn to its starting point?

  A ball is thrown downward from th)oya7ovi*)b0 kqqc1 p e top of a building with an initial speed of 19yboi7)oq*a0vc1 qp)k m/s. It strikes the ground after 1.9 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numerical va4hi ,2vvtf t9aluv hvtfa2t 49i,e in the 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//tpch;opfqhm a8/x , with a speed of 23.5 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 14 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 14.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t = 1 yd u(amk0o wh0v:sb2we89h 0o.0 s?

  In Fig. below, what is the velocity at fisx v gtw45(i6+s*md x0wq8w t = 2.5 s?

  In Fig. below, what is eix : )alsh9;ju34pxbthe velocity at t = 4.0 s?

  In Fig. below, what is the velocity at;.5 tig9wqse3j xekuf v9sd/o19q 8pa t = 5.5 s?

  In Fig. below, what is the average velocity from 0 toim -nx+er+*vpspu yg 3o8zf)+ 4.0 s?

  In Fig. below, what is the average velocity from 0 to 6.0 y hk e,o1d82tz-qd*qct7l6bt s?

  In Fig. below, what is the8 awuhl2a7gj.nt 5n2c acceleration at 1.0 s?

  In Fig. below, what is the accelera t1q,5-byfjiq*5cor ztion at 3.0 s?

  In Fig. below, what is the average acceleration from 0lj+( gvk1enaoxcr. 4 8 to 5.0 s?

  In Fig. below, what is the average accelerationxqc:+fkiv g /0kaz0 q: from 0 to 8.0 s?

  In Fig. below, what is the di/mz il gqj 3yy:/(mq(csplacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|veloc:/)r7ifvs +1tu xhrq s6qnin 8ity}

  An object can have a varying speed if its veloc kv2c(/cvvth .ity is constant.

  The velocity of an object can be negative whn+3(t ) l;lfjr2r nddxen its acceleration is positive.

  If one object has a grzhjep) es44wr .4yb5reater speed than a second object, the first must have a grejpyb4s er4.45 ew)hzrater acceleration.

  Two cars emerge side by side from a tunnel. Car A is traveling with a spf1-wr*tfg5km:)yix d:s gv23/p+p m3zvbsn eeed 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 abdu lq83sj lrc.-q 8.its acceleration decreases.

  A baseball player hits a foul ball straight ugre6u3 3iilwj gcjv- ndk, 0(.p into the air. It leaves the bat with arci6eil30g3( .wvduk- ,g jnj 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, hwpz +b 3 zxwvld:l 8dh**b9b/how does it change if air friction w xl+ hpv9b* 8:dwz/hdlbz3b* is ignored?

  As a freely falling object speeds up, wh4gl n:end8w.rat is happening to its acceleration, how does it change if air friction CAN NOT bn leg.rn4:wd8e ignored?

  An object that is thrown vertically upward will return to * drr1epg8jw8 its original position with the samp88j *wrredg 1e speed as it 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 h3s(5-n n -pyly2:pisu x- yo pr7t.yanonzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration h8.nylfpeky38h f d; e5ig/03p* ogxgat the same time.

  An elevator moving froh4mai g/hr li -78j7p/i me3mym the second floor to the fifth floor making no stops along the way has zero acceleration allmm3py/h8i4 halerji 7- i7m/g the time.

  A rolling ball moves dlole(b)b 5t:x urt;8nc) 6d/ ex ylw4from $x_1=1.7 \mathrm{~cm}$ to $x_2=-7.4 \mathrm{~cm}$ during the time from $t_1=2.3 \mathrm{~s}$ to $t_2=5.5 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.5 \mathrm{~s}$ is at $x_1=2.0 \mathrm{~cm}$ and at $t_2=3.3 \mathrm{~s}$ 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 qo/hk j,e unnaukid,f90*y)2zuarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 12.2 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 hql 9spiifo vyq4f 5)5;)cgbvz.d4 .xa straight line, moving 103 m away in 12.4 ).s5ifi;dq zcp.bf) v5 o4q yvx4h9gls. It then turns abruptly and gallops 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 frxc/d:pq5ta 9* fy kc2dn7bqp3om $10 \; m/s$ to $25 \; m/s$ 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 r+rt,7-ppcr)0q jj er$21 \; m/s$ to rest in a distance of 77 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed osf6+r 0p1okabxy n3-bf $27 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.6 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can bubzbpgz oub2 jjw.ppr6- . -7 je+slq.k+b6yy+rst out of the blocks to essentially top speed aboutbqyy+ o + pk- zgbjpbs+w7.6.j.b-6pz j2luer $10.5 \; m/s$ in the first 10.6 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 uniff * z,jxy ishew:ns,87zb 2c1tormly from a speed of $17 \; m/s$ to rest in 4.30 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a mtw1 6kfv;52n2cno zscar leaves skid marks 92 m long on the highway. Assuming a deceleration off5 w 2v6 m1zotns;2nkc $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck /qu f2.dccf3h kw,jc8going $25 \; m/s$ 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 thasj h87z nlyt9*n 30.0 min. After exactly 27.0 min, thsn* 9yhj8l7tzere 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?    $s$