Suppose that an object travels from one p9:- 8tihs tmhjoint in space to another. Make a comparison between the displacement and the distance travelsmt:h-h t i89jed.

  When is the average velocity g / cnr5oi1+ds a,uv;sof an object equal to the instantaneous velocity?

  A new car manufacturer advertises that thyau*z3 s 3*rakeir car can go "from zero to sixty in 8 s". This is a descriptioz *s3ra*yuk3an of

  An object moving in the +x axis exhz:t7p6m+*nj ga oj)s periences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling 5z-2s m olrw4xto the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceler- mzlwsr4x52o ation.

  Suppose that a car tralp7/i 6gb0.xnqb ip,fveling to the West (-x direction) begins to slow down as it approaches a traffic light. Make a sta,/qx p6 ibn7b g.fi0lptement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Md+k9 *hy-w7xh4o2 jponoxr +cake a statement concerning its accedh 9x+ rjxcyon+*o-4hp 2wko7leration.

  If the velocity of an object is zero, does it meanu hkxqc: nu4lu n9 +9/tyhi9ft;6ze5 n that the acceleration is zero? Support your answer with an9ci+6nue9 hk5;uzn/:f x4nltt uy 9qh example.

  Can an object's velocity change dilmu s 73b9flob7 fzs66rection when its acceleration is constant? Support your answer with an 9b m3fs76bs7z6 fllu oexample.

  Suppose that an object is movin6fj w,pkr)y-ng with constant acceleration. Make a statement concfy jk)w6np -,rerning its motion with respect to time.

  Can an object have increasing speed while its acceleration is decreasin vp-94qqirw6pg? Support qiq4r -vpw96p your answer with an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice. 7k)g;l y6mznlfp-qr 1Make a statement concerning it ; )1zqry6ln 7k-gpmfls acceleration.

  Under what condition is average velocity equal to the averag a.mp*l3;jev ce of the object's initijl av .cpe*m3;al and final velocity?

  Objects A and B both start at rest. They both accelerate at the same 23t vjwvv,bqjsrf * m z3ebd,-bit5:.rate. However, object A accelerates for twice the time iz25b 3j,jqvbesvfvw3: rtbm -*. dt,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 . hapdc ;z nmr ro1*ml9vk :/3:xdca8raccelerate at the same rate. However, object A accelerates for twice the time as object B. v :rmxn lm3cc/orr.a akzd8*1 d: hp;9 What is the distance traveled by object A compared to that of object B?

  When an object is released from reh1zf )i3 hrrpfo1a 8h*st and falls in the absence of friction, which of the following is true concerning its motih*) iz3rphfo 18hf1 aron?

  When an object is released from rest an 7ext,i e;0ifg2gn6 tx7tmjh- d falls in the absence of friction, which of t m2txgex7nh-ti7ef60; gjt, ihe following is true concerning its motion?

  Suppose a ball is thrown straight up. o(fhkk+l t bjk:wry la1c pr4w335,6jMake a statement about the velocity and the acceleration when the ball reaches tlpcbkt31 rwoy 6aj(5w +lkhf43j :,krhe highest point.

  Suppose a ball is th)s *wjvo ob3jm/pc :gu f*0eh2rown straight up. What is its acceleration just before it re pg *w es2:j hb)o30ocvjfu/*maches its highest point?

  Suppose a ball is thrown straight up, reaches a maximum height, thea 2.w i +.-rono5snfw7jxbf e3n falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is goinfn-bfww7 xjeo .3ias2. 5+nro g up.

  A ball is thrown straight up, reaches a maxi3h/6lxutjy4 i mum height, then falls to its initial height. Make a statement about 364xj ti y/hluthe direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the ab19yd cnn6t30f0 gi89ufr 2 tqwz q,ppasence of air resistance. Make a statement concp, 8 ac fd y0q3pn9r6gqi2n0utwt1f z9erning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. Whats c9d(n+m sibi,u wlp3h 1 g6;k.vlmf: is her acceleration when shmv+g (3ilhpus:,fbi1;wk6ms .l9 dnc e she reaches terminal velocity?

  A ball is thrown vertically upward with a ,9 )s qbso-xsd;d8f/ho j-e z p1)jmzbspeed 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 -mds hfjbs )/z o,xsj o)bz-pe9q 1;8ddoes the second ball go than the first ball?)

  Ball A is dropped from the top of a building. One second late(;w ppaq g;pc.r, ball B is dropped from the same building. As time progrpgw;ac;qp p( .esses, the distance between them

  Ball A is dropped from the top of 4zeghb/g:,w j a building. One second later, ball B is dropped from the same building. As time progresses, the difference / g4,:ewzhg bjin their speeds

  Two objects are thrown from the top of a tall building. One is thrown up,7-d)4t8d xv aa1wpfb a and tdad-px4af1 a7 tb wv)8he other is thrown down, both with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a bui 86tpq0 .r.d4bsey qkilding. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks. p48dis r.6be.qkt 0qy

  An object is moving with constant non-zero velociltuc 1g(5b0f lty in the +x axis. The position fl5 l1(buctg 0versus time graph of this object is

  An object is moving with constant non-zero acceleration in the bih)*5m3src i4ja( jr +x axis. The position versus time graph of this objeirir sh 4(*mj3caj)b5ct is

  An object is moving with constant non-s(yh wsf//1(xa4m7soqb r,kuzero velocity in the +x axis. The velocity versus time grapf(( ums7 y hrx,wsb/q1aks4o/h of this object is

  An object is moving wi4y*, -xp fa1rq,6ra f/js plnsth constant non-zero acceleration in the +x axis. The velocity ven,6s /,fy x1 prl4sqfarap*j -rsus time graph of this object is

  The slope of a position ve;l7d y/hlpt 1srsus time graph gives

  The slope of a velocitkkmh6 t9 v , hd9zp/ri bcc-d549ui*ewy versus time graph gives

  The area under a curve in an acceleration vem/n1h*ul stixjv. st1lwk1 9 zv a1-y+rsus time graph gives

  The area under a curve in a velocity ve9um3 ath.8e+l3ij d /- zzgprersus time graph gives

  If the position versus time graph of an object is a horizo1htf7j6 nx uv6ntal line, the object j7f61vn u h6xtis

  If the position versus time graph of an object is a vertical line, the object 3etd (d:j+z yvjyaw :2is ye: v+d:j3ztwyjad(2

  If the velocity versus time graph of an object is a horizontal line, the object tq9 .xa(*opd1dj 3 mgmijd* tmgx(qo19 pa .3dms

  If the velocity versus time graph of an obw :va72v9aiv:8c jwjci .b jf*ject is a straight line making an angle of 30 degrees with the time axis, t v:ivj jw7 8*: caijfcw2v.ab9he object is

  An object moves 15.0 m north and then 11.0 m south. Find both the distan(lno9/b 8aa9 a ee:zrr rep,s7ce traveled and the magnitude of the displacement vector.9,(8 ro 7:9aae/e nabse lprrz

  A boat can move at 30 km/h in still water. How long will it take tkupd/t 00i+ sqo move 12 km upstream in a rives d0/k ut0+qpir flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609 m)7mvi wwo0c f:8

  What must be your average speed in order to travel 350 km in 5.15)6, uh;j g,72sjihigv wpb.8 vjcjg 1t h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min.v+og 4fz2:j0eraw 9 sj What is the average speefg +90ojwv 2erja4: szd of the runner in m/s?

  A car travels 90 km/h. How lonz /0bv 6 nnv1r4:s*gq.gwkdnwg does it take for it to travel 400 km?

  A ly (light year) is the distance that light travelgzkd ty:8x ,o7ae0 gr1b2auz) s in one year. The speed of light isz8gk rxg ue,21)o a:70dtzayb $3.00 \times 10^8 \; m/s$. 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 stdxxqu wl 2bjm/8r,x-0 raight road and you look to the side for 4.0 s, how far do you travel during thisdqb 8,wjlxx2-x m 0ru/ inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, your averame :xs( bdc7eu.m 86okckb8.e u ( 6emdmx7s:oge velocity is

  A polar bear starts at the North Pole. It travels a 3o;-/s vo/5rbw ihmo1.0 km south, then 1.0 km east, then 1.0 k-i5savoor h/ m3w/ob;m north, then 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 t;)dk:ykyr-.d e ath0f ravels 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 4a dyf; kert)-y dkh0:.5 min. What was the bear's average velocity?

  You are driving home on a weekend from school at 5d: wzwl(8fl**r c8d1p 2zrtpc5 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How p8 rl(1pwdz*r: d*8lftcc2zw far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What is the avera )ay3b:ye,d51gb qjgtqnun ,5ge speed of the motorist for this tripu ebyyqj 5ag1,3:t5ngnd)b,q ?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100xhz* 1u)4vqr7z 4s(lks / zsrdobql,1 km/h. What is her average speed for the sz shuzvq1*o/, 4s4b( rq7)r1xd llkz trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h north fo6vg nl95.pu; io1 ffakr 750 mi 9.1f 5ngakuo6 fiv;plles. What is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs thezebe,3 l pbpu0j1) 5lgy5f9p5d gky) h 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 starp judpe k p9 hz0 )gfyy5b3,l1)55belgts 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 9 s. The car5cvdqb132ub vye e3 6x's average velocity during deceleration was 58 km/h. What was the car's deceleration while slowin1b5q yb u2ev6cvedx3 3g down?

  An airplane increases its speed from 100 pb2 no91/gco am/s to 160 m/s, at the average rate of cgn/o1a pbo29$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km ar;f q0z v.kqhug7d;./h accelerates 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 accele7lub, tb g55jic ;n8jdrates 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 s6. 9bamhd r0zge)ab7 ht/rdy(peeds up with a constant acceleration oy .bg7/e()abtr hra9m6dh0z d f $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 3.0 m/s exd. v2 gti*mg1vperiences a constant acceleration o d1v.*mtv2gg if $4.5 \; m/s^2$. What is the cart's displacement during the first 4.9 s of its motion?

  A bullet moving horizontally to the right (+x direction) with cy i9 2t(y4aec rjlnqv34 mb84a speed of 546 m/s strikes a sandbag and penetrates a distance of 23.84 cm. What is the averajcyc 2r b348q9 na44itl m(veyge acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched fre)t8a9q80ee xc g3x abom 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 acceleration is constant, what isgb 8cx)tqe x0e98a3ea the length of the catapult?

  A car starting from rest moves with constant acceleration.v or4 ssu61z+r :)c,zmfzpin 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 is0lbn 6c*ve7rhj *wnf( its average acceleratijfn( nvlbw*cer70 6h*on?

  An object starts from rest ane60vg.ei oeo5 .t;gs jd undergoes uniform acceleration. During the first second it 0e6gejo.o 5v e sti;.gtravels 3.8 m. How far will it travel during the third second?

  An object is moving in a straight linerudoq;f3i; ,4flx d c: with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. Hu;q,diroxc4d3 ff l;:ow far does it move during this time?

  A car starts from rest and accelerates unw8f xk :tml:ay* f27n- nm6 lpu8g6fnkiformly 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 decelev6+p)em;wnrnp rmbbx1 u7 9h:1h ox:krate 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 that has been wzx l)6o h;o 39ralrm9maiting at the intersection starts ahead with a constant acceleration oorahox9 rl6m93 lm;)z f $2.00 \; m/s^2$. 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 exq;e* s3m, qlpjhe9 012 m/s on the surface of planet X where the acceleration 30exmq,sqpe;l e*j9h due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward aq 7r4r)y-a xxhf1l +o)v0.i7jzawnkwith a speed of 12 m/s on the surface of planet X where the acceleration due t )71wzjarrkl f0qx n .y74-)a haxio+vo 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 opb8l ;kln. r1kd6es0+:z qng3xw6 cosf 15 m/s on the surface of planet X wherepbw nqk.8s l+en6rs03dkz1 gc 6l;:xo the acceleration 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 surface of plaov 4j wppnz-4**cqr :( gia jof,2w.dfnet X where the acceleration d opv*qwi. jjndfp ,(4 2*rac wfoz4g:-ue 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 0.10w ha931jyt,o 8hrq:u s s. If your friend holds a ruler between your fingers and releases it without warning, how far can you j9o whuha, y8t 31sq:rexpect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. What 5 q-90f qdgdrjh13y xg/v:zet is its velocity after 3.00 s?v 0 jqetq r f/d-dz5:ghx1yg93

  A bullet shot straight up returns to its starting point imb1 hq-ymg40w;7xb k dn 10 s. What is the initial speed of the bx 0mywm;bk71d4-gqh bullet?

  A ball is thrown straight up with a dsm88 9/8yosxqeum.bg g/t9nspeed of 36.0 m/s. How long does it take to return to its starting p u8.tomeg9sys/8mdnq /8xbg9oint?

  A ball is thrown downward from the top of a building with an idekd(b oe (rv8r;u3h 8r8-rkk nitial speed of 5 m/s. It strikes t rrhoud(d verr-k8ekkb (88;3he ground after 7.8 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (o7u:ed1 9yt,c1sj f0ualj -f qdnly fill in numerical value in t y7 t:e ,c9sddaf-q lj0fjuu11he 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 straigv1/u clu:t f (q.pgf+rht up into the air with a speed of 21.8 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 12 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 12.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t = 1.t yn a+s*6n ovc g ,nt1z2490xj,zdokx0 s?

  In Fig. below, what is the velocity at t = 2.5 u8pv5btrt( k3s?

  In Fig. below, what is tb8,y1a() 33aafit*ztwn lh xthe velocity at t = 4.0 s?

  In Fig. below, what is the veote3,g3l s7w nlocity at t = 5.5 s?

  In Fig. below, what is the7wv 8 qrq+six, average velocity from 0 to 4.0 s?

  In Fig. below, what is the averaak5hf pegk0 47 c1t7gy0h-e*ms i l+fjge velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration at 1.0 c1p)/dx(a +acry 5g izs?

  In Fig. below, what is the accelera/dc;sx4(thx t tion at 3.0 s?

  In Fig. below, what is 3d jz):ccl8g5 :lvwaq zun /v:the average acceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration6q ep2wanbk/4 from 0 to 8.0 s?

  In Fig. below, what is the displacem:bi.t t+ot3kk vc; 3iyent from 0 to 8.0 s?

Does a car speedometer measure speed, velocity4zb3ji6hi;d (j9r+ n eba5qhk ? {speed|velocity}

  An object can have a var+t05kcf,b + nx;iu v(wtwmr v(ying speed if its velocity is constant.

  The velocity of an object can be negative when its acceleration)b7g5h6piwt,a* . c *mxb ilbj is positive.

  If one object has a greater speed than a second object, the first must have a xj8: k;i d9p r6(reybagr b ;j9k8edap( yrr:ix6eater acceleration.

  Two cars emerge side by side from a tunnel. Car A is traveling r1nq )yx k-2;ohi,ogm0gzawy1m: 2fm 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 acceleratioxkuxwky+* j). g .,m5jw hxn*jn decreases.

  A baseball player hits a foul ball straight01ukeu. xs3jo)1ks m 2xi q+cx up into the air. It leaves the bat witu+j m 30kksu).xo1 xes1qx i2ch 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, howzy ,i)awjd1enp ;z2i5 does it che ziz2n,; d1iyapw5) jange if air friction is ignored?

  As a freely falling object sp *l(4) ,vedsf)smm o4aoo:cq eeeds up, what is happening to its acceleration, how does it change if air frictvas)ef *c)4: moosol ( d4qem,ion CAN NOT be ignored?

  An object that is thrown ver4t.l vk241 aaey, bez;qz efa8tically upward will return to its original position with the same speed as it had initially if air resistance is negligible. If air resistance i4y., z kbqe eteva4al1faz28;s appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration at i9 olquu o3tal,d 4qq:ep7)(sthe same time.

  An object can have nonzero velocity and zero acceleration at the sak y8: d+e6ohccme time.

  An elevator moving from the second floor to the fifth floor mq-2(ds kznnlf99mb ; haking no stops along the way has zero acceleration all thhlq-2s n 9;nz f(dmb9ke time.

  A rolling ball moves from(6b.t* zprxl mk-uf kuy 71qp. $x_1=1.9 \mathrm{~cm}$ to $x_2=-8.7 \mathrm{~cm}$ during the time from $t_1=1.4 \mathrm{~s}$ to $t_2=5.1 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.1 \mathrm{~s}$ is at $x_1=3.1 \mathrm{~cm}$ and at $t_2=3.1 \mathrm{~s}$ is at $x_2=8.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete (g g*2lm-i:kmo kxl k.laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 6.9 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 st9adp . /ql.gun1br4b iraight line, moving 116 m away in 10.6 s. It then turns abrup1/ualqpdbg inr.b9 4. tly 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 from om:(tg; n kb()f-f dzp$11 \; m/s$ to $22 \; m/s$ in 5.4 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 fromosbx,v.nv5tqs2 0/ yi $20 \; m/s$ to rest in a distance of 58 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speb4 ga6cjs0y tofdi8e8 p5t;g- ed of $32 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.1 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter canb;j;m+bys cjv2mt (5j7w0au i burst out of the blocks to essentially top speed about wj;+5mymas vjc(;j iu 7b 0t2b$11.0 \; m/s$ in the first 11.7 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 speed of9/bu:f8 on * eenolrktfc,3 lpyj92: o $16 \; m/s$ to rest in 5.76 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a ca8;sjv itvtdz18 y 2)iar leaves skid marks 92 m long on the highway. Assuming a deceleratiotas j21 dt)v8;v ziyi8n of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truci , g685y.e3 w xmk3 ;6ftbap8hjpxqgwk going $25 \; m/s$ 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. After exactlphn* a:l(y *cjy 27.0 min, there are still 1100 m to go. The runner jlp a h**cyn:(must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$