Suppose that an object travels from one point in space to 3 m+-kq/xedmn 8 8skananother. Make a comparison between the dik ame+dsxq n3-m8k8/ nsplacement and the distance traveled.

  When is the average velocity of an object equal to the instantane+rjdem apqzkwqv)+ x47t 4/t+ous velocity?

  A new car manufacturer advertises that their car can go "from zero to sixty i.h s;,n;, d-imil7 kp bjqvp.fn 8 hi 7dv p,m.qls,n-jik;b.;fps". This is a description of

  An object moving in the +x axis experiences an accele; u5w(oid8f s7 7xoxseration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x d./lbsw lj4u b0r -9dqairection) begins to slow down as it approaches a traffic light. Make a statement concerning its accele lq.bjsuw/abl0-rd4 9ration.

  Suppose that a car traveling to the West (-x direction) begins ax2s;7mdc e3b65by c w4vkky)to slow down as it apprs;xmeywd3c2)y6 b b 7k kac45voaches a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constac6nqin yj30od * 5-sixnt velocity. Make a statement conce *-cjxnndq63y5ioi 0srning its acceleration.

  If the velocity of an object is zero, does it3oq+ypehl6 vn ,xmj.7 mean that the acceleration is zero? Suppo vp o6m37qy +nx,.jelhrt your answer with an example.

  Can an object's velocity change direction when its acceleration is constant? pbdlf5 tf5-18jqth1gSupport youd-fg8jtt p1q51b f5h lr answer with an example.

  Suppose that an object is moving with constant acceleration. Make a sdnj6x/g1b. bkzawt i/ y 2om,5tatement concerning its motion with respect t1mgibbjd y tkz./26/n xwao 5,o time.

  Can an object have increasing sig uwo /ul+0p(wa+ (iqpeed while its acceleration is decreasing? Support your answer with an example0 i(lu/qp+a gw ouw+(i.

  Suppose a can, after an initial kick, moves upguk2g03i 0jooa :4bxt5 yobn* along a smooth hill of ice. Make a statement concerg t:n05u4 abxb j3oyi*o0o2g kning its acceleration.

  Under what condition is average velocity equal to the average of the object's 3wa 0lakjk ),hinitial and fina 0w)a lk,kja3hl velocity?

  Objects A and B both start at rest. They botqb68bqax,tw t5 wam(8 h accelerate at the same rate. However, object A accelerates fo 8twmq5a8 (xqt6 w,bbar twice the time as object B. What is the final speed of object A compared to that of object B?

  Objects A and B both35wlvv ieew1+ start from rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by ol ei 51w3vvwe+bject A compared to that of object B?

  When an object is releasedk-lrm(h e )x3d(ae58dvqx yb+ from rest and falls in the absence of friction, which o-dxrelmqd3+x(a 5 )ykehv8(bf the following is true concerning its motion?

  When an object is released from rest and falls in the absence of fricrnx st-0e5 *;vej8 fnhtion, which of the following is true concerning it*tn;sre 5en-8jh x0 fvs motion?

  Suppose a ball is thrown straight up. Make a statement about the331 rjef9 norr velocity and the acce93o3rnfe rj 1rleration when the ball reaches the highest point.

  Suppose a ball is thrown straight up. Whan(;:ptx7s hqrt is its acceleration just before it rph x:tn7r qs;(eaches its highest point?

  Suppose a ball is thrown straighby1b4 ho8 yu4ht 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 gobouy48y4 h1bh ing up.

  A ball is thrown straight up,- x0lijnn6 :mhk0 e*oh8c7avb reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball isn8hkeovm6lb -njh:*ix 0 70 ac coming down.

  Suppose a ball is thrown downward in the absence of air resistance. Makeicxlw i 4lt106 a statement coilli1t 460cw xncerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her acceleration *7sky6.g rp5d akhu(xwhen she she reaches terminal velkas7 d(h rux*g65.yp kocity?

  A ball is thrown vertically upwahma 8lu;h*v q3w.r s:brd 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 shl8 3ab:;hq vmw*urs.econd 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 lb+*c1x yw2tdtater, ball B is dropped from the same building. As time progresses,cw t+1xbtdy2* the distance between them

  Ball A is dropped from the top of a building. One second later, ball B isatp.,vw b+o 1r dropped from the same buil w po.+b,1rtavding. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall buildint)k cc(j6jvq8;sx i m2y*h/)pub *mkvg. One is thrown up, and the ot tkukp)*c6;)jmiv sbx/j hcv8q*(2ym her is thrown down, both with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the t2ts 1efiba+ )rop of a building. A second brick is thrown straight down from the same building. They are released at the same t e+2ftb1sa) riime. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. The positz 52 zsdaook cd*qcq o-nl(:xw74ak.(ion versusk-x2(zo*aonl.7dwqc(q s c k5do :za 4 time graph of this object is

  An object is moving with constant non-zero acceleration in the +x axis. The-7( s5d2zxtd +i :s gu.htmkih position vtz+xmghdt. ( h ids:5su2 7k-iersus time graph of this object is

  An object is moving with constant non-zero velod vcvnj98b7*v 4j p0xthqz +2acity in the +x axis. The velocityn4 bva7*jqzv 80pxh 9vtj 2cd+ versus time graph of this object is

  An object is moving with constant non-zero acceljzn5w1* fk :tltm6ym -eration in the +x axis. The velocity versus time g:- mwtytn ml1kf j*z65raph of this object is

  The slope of a posith+/ a5 io/yy 2crs4bgoion versus time graph gives

  The slope of a velocity versus time gy dt4n82dqr. w45deyiraph gives

  The area under a curve in an acceleration versus li; ; k dcqrmyu:vr134time graph gives

  The area under a curv1.d: e4lhqo+ l0z,w b7bzlzxze in a velocity versus time graph gives

  If the position versus timei q12w w9 9ntp wk g7/tyw4t4vdj,o3tu graph of an object is a horizontal line, the object iv4gt 9k4ww, jinqtpt7t31ow /y2dwu9s

  If the position versus time 2nx0bhq1 u gv)u6dk 14clkci g/tg .-2azxyx,graph of an object is a vertical line, the object is6zklb tdg uhn , 01 i4-)1 xk/.yg2acxgxc2vuq

  If the velocity versu81ya( 1 w:d1dyks7k3cty 5ihjju6z oks time graph of an object is a horizontal line, the object zt6dckdw8yyh13 uajkos51y: 17j ik(is

  If the velocity versus time gr1 m e0zpu33ncrjc7ey 4aph of an object is a straight line making an angle of 30 degrees with1j7z3y rcemnc u3e0p 4 the time axis, the object is

  An object moves 15.0 m north q;,q1hd09h cmrw m4 eoand then 11.0 m south. Find both the distance traveled and the magnitude of the displacement vector.9 rmhoc q;w4dq e1mh0,

  A boat can move at 30 km/h in still water. How long will it take to move 12 ktwang3acc( f ad37;a ;i cf;,fm upstream in a river flowing 6.033, t7gdaficwcf; aa cn (f;a; km/h?

  55 mi/h is how many ms8*yc(4v u+p rses6 ls/s? (1 mi = 1609 m)

  What must be your aver qm8d-b y(ns:rtcrl-)age speed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approv m(k1t4ma 8kxximately 42.0 km) in 2 hours and 57 min. What is the a1mm k(v8kx4 taverage speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to travel 4swaqjf q/b266 00 km?

  A ly (light year) is the distancevie(ci( ;+sp4:7aujkfkv8 wa pbv :6 c that light travels in one year. The speed of ligh jvv:u:4cpiki k ecpa(bv;w( 6 7+as8ft 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 roadm w sjyj7oe 5xg)ib7.9,r.k iu and you look to the side for 4.0 s, how far do you egr y .,b.)9isw5uim7kxo j 7jtravel during this inattentive period?

  If you run a complete loop around an outdoor tra2 *g.swv/ hde; 5zfpydck (400 m), in 100 s, your average veloc.5yhwe 2dzfp * dgs;v/ity is

  A polar bear starts at the Nb5kc /r * u4;uupoy,rvorth Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west,/o4 cpuvbuy;r rk5*u to return to its starting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts ae r6yh97a/cr yz-- n r*d;bwaat the North Pole. It 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. This trip takes 45 min. Wenz9-haba-7c r r/yd r;a *yw6hat was the bear's average velocity?

  You are driving home on a weekend from school at 55 mi/h for 1p)m37b1d67kbzkxalt*zxq gl q l19c (10 miles. It then starts 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 schobz blmq7d3l79k 1talc q()gx p6*zk1xol?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What is the arnuh xjmpq f+k89v-b-2 nh36 s+7hxfq+cxx l.verage speed of the moto fhkh ph unlrq2x+3mcx9- xnxsb.q 8-6+7+vj frist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. xi,uq9z:f )y no3ld wsna3:g+ What is her average ,uxz :n)339qd wg+o:nyial fs speed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h ndxbnw*; ;k 0dc-im/ ),acxcstf4 e j/porth for 750 miles. What is the average speed for;/sm xi*tcadckb;wp fj-4e d)0/ n ,cx the trip?

  In a 400-m relay race theabhwv- crqzkc81 +te, kt49:g anchorman (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 runner can have when the team A runner starts the final leg of the c t,ca8 v14q -k9+hgezkr:t wbrace, in order that the team A runner not lose the race?

  A car decelerates uniformly and comes to a stoyr2jj5 )smsi1 p after 8 s. The car's average velocity during deceleration was 74 km/h. What was the car's deceleratio1ism r5 sj)2yjn while slowing down?

  An airplane increases its speed from 100lt,fknwtyi7( ) .42 k4xmzfif m/s to 160 m/s, at the average rate of (xl4t)tf., i4w2y7k kminff z$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the ratei-uxfpr,n cvv) f;k)hi2:r *z 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 ac9c s 61y2fd47ev-qqemhad)w d celerates 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 acceler 5 iqinilau4nfd3l0soo j5r+5yi:*m 5ation of 5if aj riido 5isl50*ou3 +4nn:yqm5l $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocitiz7 b0pg fk/7rdc7+jcy of 3.7 m/s experiences a constant acceleration of zb/i cp7cd0 7+gk7fjr$2.1 \; m/s^2$. What is the cart's displacement during the first 4.1 s of its motion?

  A bullet moving horizontally to the rigr zi+-9z4nt d)a xsh9u+w fsbb0*zg-cht (+x direction) with a speed of 431 m/s strikes a sandbag and penetrates a distance of 84.28 cm. What is the average x -+9t sc4-digbn*w bzas0 z) hr9f+uzacceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapultpx60 m lx8nt8*ruhq3 3 noeku09ph/uf 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 acceleration is constant, what is the length of the cata08lhfmeu unqo 8/ xxp6*903t nu 3pkrhpult?

  A car starting from rest moves with constj,o4:h;qo9 82o 8lhguw ub)cg+oh kvlant 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 its average acsmbjtcc 0-a.bd.6 w2s; q8pqqc82qb6.bc;at j. spdwq msq0c-eleration?

  An object starts from rest and undergoes unifo.4c 60mxjmx z,3zmx /xnb,dadrm acceleration. During the first seconx.0dx3ajx6mmxnb /dc,z mz4, d it travels 6.6 m. How far will it travel during the third second?

  An object is moving in a straight line .npr9 zl i2ryn7z uu.8ji1u6fwith constant acceleration. Initially it is traveling at 16 m/s. Three seconds later itul6r n yzp2ruu1fi iz7.8j9.n is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates uiqe.nwsv(fnl5g:62 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 ona ez3)x1 zm q59tf9vva 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 turns green,x uisfhm5 )(bu5mi-s kcssg s y++//l/ a car that has been waiting at the intersection starts ahead with a const/ syc+l+ bxgu(su/s/ik)hm 5sim-sf5ant 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 speydtn +o2n+:cy lyho.ag :/uv,i /4it1 0xrbg ued of 12 m/s on the surface of planet X where the acceod rtyy0 :ut , unvhgg4i.n /1+lib+oya2 c/:xleration due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upwc 3nbry 8uz-,eard with a speed of 12 m/s on the surface of planet X where the acceleration due to gravity isu8cze3nb -ry , $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

  An object is thrown upward with a speed of 15( .,kijd6q .s.l;t teh;wuncn m/s on the surface of planet X where the acceleratione.u. hnq ,ni;( jlwsd6c.ktt; 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 upward with a speed of 14 m/s on the sqck(j :*h mga*urface of planet X where the acceleration due to gravg h *c*j:qkma(ity 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 7w8m0gw ex7 xrvx5-vs.10 s. If your friend holds a ruler between your fingers and releases it without warning m07sgrxwvvx-7ex8w5 , 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 velo6sv mz 1(42grhezz wu7city after 3.7 gm6hrz1zuzvsew (2 400 s?

  A bullet shot straight up returns tn9nrt 6omfsxk*p15l4 o its starting point in 7 s. What is the initial speed *txnpknrsl6951 om4 fof the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How longhl(..i ywjy6 z does it take to return to its stlw(i .zy6 yh.jarting point?

  A ball is thrown downwardeq8oqml 3 tzg/d2,w8 b from the top of a building with an initial speed of 29 m/s. It strikqq l e8w,8odmb3 z2/tges the ground after 3.2 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numeric8oz0 /sn/b- kufjd 460f eow+qvaaqs3 al value in the blankaj8uk/4wqf+aq 3eoz0fn vs6dbo / -0ss)
(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 a speed of 22.5 m/s. (pl7tet,: u 1isuse $g=10 \; m/s^2$, 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 1 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 11 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 11.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the vdate u3a5; akq;m2a/ 28fxmvfelocity at t = 1.0 s?

  In Fig. below, what is the vel5v,vs38 u ;pv2jgwb xrocity at t = 2.5 s?

  In Fig. below, what is the velocity at t o vi-rmcg wc93*5:h eh7onuk) = 4.0 s?

  In Fig. below, what is the velocity at t xz, o.vr.h/0md y;vto= 5.5 s?

  In Fig. below, what is the average velocity froma -m,;h2x 4daz mg/ioo 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 to 6.0 ss v*gie/ tlu.(?

  In Fig. below, what idw8*3nnyhnmn rzrf5*2 x;vy) s the acceleration at 1.0 s?

  In Fig. below, what is the accelerao: xunyxmnls,6 / d)pmq655nution at 3.0 s?

  In Fig. below, what is the average accelecqb:nqun i*+q y.n(z vg90io7ration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 to 8.xs g 0+b3;u2queg dd2fe+g(hvkj zb3;0 s?

  In Fig. below, what is the dispotvdlh 9f29fn6q wu 0k i/.u/wlacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|9 vvw-*t ofdt3velocity}

  An object can have a varying speeq1vg7trqpj*z 3us ud: )(- ujod if its velocity is constant.

  The velocity of an object can be negative when it.bonzepq/vo2 s0g1w su((bj3gz+0y92qkwry s acceleration is positive.

  If one object has a greater spcg+ ,*upf(i .jye7kejeed than a second object, the first must have a greater acce j+7eui(ck*fg, ej.ypleration.

  Two cars emerge side by side from a w9htn z s xzel:b168+atunnel. 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 its acceleration c0g70otyt v;ks z*yb8 decreases.

  A baseball player hits a foul ball straight up into the air. It leaves thewjg-4 dh0u f9u bat with a s 9hwu-0u4fdg jpeed 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 sp7gi0hg gxc) zf5)6xr ceeds up, what is happening to its acceleration, how does it change if ax0f cx) g )g6izhr5g7cir friction is ignored?

  As a freely falling object speeds up, what is happening to its acceleratibnq.. 6t;(fu5 z(yhthkqirf 6on, how does it change if tn6 (qk; (.6hurbiyhzf.f qt5 air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its originao/) fxqjbxo1 9l position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciabljx) o qo/1f9xbe, how will this result be altered?

  An object can have zero velocity aov wi vy(s7r1;0ap1bdsjzh 5) nd nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at the same tixaa:5o- mvl7yme.

  An elevator moving from the second floor tm6s sdin*80cno the fifth floor making no stops along the way has zero acceleratio8c6ns 0*midn sn all the time.

  A rolling ball moves w2h;cswd* 4s ifu(w)k from $x_1=2.2 \mathrm{~cm}$ to $x_2=-6.6 \mathrm{~cm}$ during the time from $t_1=1.7 \mathrm{~s}$ to $t_2=6.1 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.4 \mathrm{~s}$ is at $x_1=3.3 \mathrm{~cm}$ and at $t_2=3.1 \mathrm{~s}$ is at $x_2=7.6 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a qua4lthq ykstk h2m:.;/mrter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.7 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away fromb/3/ansm ekpk (c*dk7 its trainer in a straight line, moving 92 m away in 11.6 s. It then turns abrup/(b*ekkna 7p/d mcks 3tly and gallops halfway back in 4.5 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 fr0 k s4 y)m(cb2mrqhy7rom $10 \; m/s$ to $24 \; m/s$ in 4.4 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 fromt tkz9+ n;y:ve:b0obc $19 \; m/s$ to rest in a distance of 57 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must rem5/9gco7 d-/6xxpy (wtq c vjpach a speed of $26 \; m/s$ 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 burst out o fe+qn ow6gl/ 1(yvvu5f the blocks to essentially top speed abou16+ qvnuyo(lge /v5fwt $11.4 \; m/s$ in the first 10.1 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 a s1vao/11 ogb odpeed of $18 \; m/s$ to rest in 5.51 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 m long on the highway. Assumi;f.nd-w kp (fmeg/*xp ng a deceleratif wx(kf d*mnpep/ ;.-gon of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goi0 zx.mzz g/taf23 o*beng $25 \; m/s$ 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 completvv )p, q fdanf,piblb92d*yb w5(q60te the 10,000-m run in less than 30.0 min. After exactly 27.0 min, tqybw, pqdv2 lvf0dt)pi, *6bb5f(an9here 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?    $s$