Suppose that an object travels from one point in space to anothay gbfwcr :71 a8sq7;zer. Make a comparison between the d:; sb7z8yg1a ra 7cfwqisplacement and the distance traveled.

  When is the average velocity of an object equal to the ine51y rc9 gx2ipstantaneous velocity?

  A new car manufacturer advertises tx ;xr6q qe v0px*gjb)v n+va(0hat their car can go "from zero to sixty in 8 s". This is a description o0*jngv q xva(r;qpx )xb6 0+evf

  An object moving in the +x axis experied8p6 kc6giz4 jnces 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 slow do-rg46 af0f6wu) xtzzvy z r.u(wn as it approaches a traffic light. Make a statement concern6autr.x (f 0 g zwrzy4ufv-)6zing its acceleration.

  Suppose that a car traveling tozakx q0rl4cw)3t -:iu the West (-x direction) begins to slow down as it approaches a traffic light. Make a statement ct azl:)u-0kwx4i 3rqc oncerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make a st+ e slnvfo8 zj8b q l,ql8q,0bb8.fjq6atement concerning its accelerajl,z,b88l 8o. le+b bnqjq0 6 vfsfqq8tion.

  If the velocity of an object is zero, does it mean that the ac-xkz- 2b 2r:4y6o8zgcmxuu ,o kcyo- lceleration is zero? Support your answer with r6-k- - z4xobyxugoclo 8 2ukm,:yz2 can example.

  Can an object's velocity change direction when its acceler*yl0v1 ph dg+lation is constant? Supphv ld* 0lgpy1+ort your answer with an example.

  Suppose that an object is moving with constant acceleration. Makiw o5-;dw4id 44a4t z ;gyeiyse a statement concerning its motion wi dt 44ei5zwiy-wy4i;dsg4;oath respect to time.

  Can an object have increasing speed while its acceleration 5gbi u)1frdw7 is decreasing? Support your answer d)bf7 gi51wur with an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice. M z3pftu .y6x-l :ucfy:l)jpj2ake a statement concerning its accelef l-: z x.cy 2lpf:u6p3jjt)uyration.

  Under what condition is average velocity equal to the average of the objeccqos :ytrdoa+ 6i3, c*t's initial and final velda+*cisr,qo6 yc t:o3 ocity?

  Objects A and B both start at rest. Th 09u*/ec skjoi tum3-qey both accelerate at the same rate. However, object A accelerates for twice tc9 /u0k u- mqi3es*jothe 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. Tspbmy 6yr/80vhey both accelerate at the same rate. Ho 8v0prbs my6y/wever, object A accelerates for twice the time as object B. What is the distance traveled by object A compared to that of object B?

  When an object is released from rest and falls in the absence of fricth 3lw2lwx7 g8d1 yj;qcion, which of the followy83lh1wx2gj 7 clq ;wding is true concerning its motion?

  When an object is released from rest and:emoh w-z( bl8 falls in the absence of friction, which of the following is trulm e(8 :-zhowbe concerning its motion?

  Suppose a ball is thrown straight up. Make a statement abouy 5 1l49pv,npwhf/pce t the velocity and the accelerati4p9,ew/ fphvn 5l 1cpyon when the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration just 9.tcyjb;4 a 2asc.ubwbefore it reaches its highest poiy4cat.ac w b 2u9;bj.snt?

  Suppose a ball is thrown straight up, reaches a maximum +g h d51mrqh6xw g0ny1height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as thr ghg 651n0hyqxm1w d+e ball is going up.

  A ball is thrown straight upff hz z(grrb/ *:/nso7, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the vezs(f:zrb/ ro/n7fh * glocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistanlgwc/b3c (k9am kv0w4gy8 4 zhce. Make a statement concerning its accelegm bw494c08ygalk/cz3hkv (wration.

  Suppose a skydiver jumps from a high-flying plane. What is her accnjkqe,v8y)4 e*n7vxqeleration when she she reaches tevnjky7 eexq)qn48, *v rminal velocity?

  A ball is thrown vertically upward w) xfu0)lbxkb) 6j 8wppith 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 does the second ballb0pfkx 6bw x)8up)j )l go than the first ball?)

  Ball A is dropped from the top of a building. One ser en*cg5bbe (6cond later, ball B is dropped from the samegb6er 5 cbn*(e building. As time progresses, the distance between them

  Ball A is dropped from the top of a brx+qj*8 2b-sou ickvh /jqsr 9+ud82nuilding. One second later, ball B is dropped from the same builv++8rqk*d nji c-2qbs/8u9s hruo2xjding. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. On+4q+vf3i+gq ituv 6m le is thrown up, and the other is thrown down, both witht+ig+mql u+q v v36if4 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 brick is thrown stras m6rz:3j ol*gight down from the same building. They are released at the same timel m:gj 3o*z6sr. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. 0 n(7zrfsig2gg2r :6ncx1o.pp d6t ayThe position versus y 60pdr:f2n rn 1to.pa6s72gc g(xzgi time graph of this object is

  An object is moving with constan-z,/ zsa*d4jpe 6;c *9xgmoes2sirrbn mj.y /t non-zero acceleration in the +x axis. The position versus time.syno/mrj-e;z/4*p,i 2zbs*g d 9 ajx sc6rem graph of this object is

  An object is moving with constant non-zero vv5q+m kq(gfg ou: ,1 c2)kvmly22 wuotelocity in the +x axis. The velocity versus time gra:v (woc gvq 1mou2+lq f2,m 2kty5guk)ph of this object is

  An object is moving with constant non-zero acceleration in the +x aync:zlne4;+ lxoot+) ewl(* s ,+h n1avb)clyxis. The velocity vesclvh) e e(n,l;+lctz+:1y) a *nx4n bloyow+rsus time graph of this object is

  The slope of a positi1* 82g -vdf cbqxqto4fon versus time graph gives

  The slope of a velocitymw5v5a zpv.2r2 u48n t)vsyow versus time graph gives

  The area under a curve in an acceleration veq d: y1r r8*mn01jlebkrsus time graph gives

  The area under a curve in a velocity versugb 0t+a gv-*qis time graph gives

  If the position versus timeg)c+vqk r0z w: graph of an object is a horizontal line, the object iswg:v)+0q zckr

  If the position versus time graph of an objg ;;k qx4wulc2qi2 j;bl 7vtz(ect is a vertical line, the object is; zlv2 qi2cx4k(bql; j gtu;7w

  If the velocity versus time graph of an object is a horiz8 gz9hd zz4at1ontal line, the object is4 ga9zz t1h8zd

  If the velocity versus time graph of an object is a straight lifm +t(tjn)1 ,vydk1lbne making an angle of 30 degrees with the time axis, thelm( tdbv)1k,ytj+n1 f object is

  An object moves 15.0 m nort2d 4rub;fp:bqgw hz/6h and then 11.0 m south. Find both the distance travelquw pbr:z;fb2 gh/6d 4ed and the magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. H(m skn6hu4m-tow long will it take to move 12 km upstream in a river u(4hksnm tm-6flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 m ,jg:e9tkva3zb6 ivka2+dr/ a i = 1609 m)

  What must be your average speed in order to j5z0xlhb*) xfrl:7v atravel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 89k bgg c)c:iz2 hours and 57 min. What is the average speed of the runngc9ikz bg 8):cer in m/s?

  A car travels 90 km/hf:wm)e slq8 i(f4c z+h. How long does it take for it to travel 400 km?

  A ly (light year) is the distance that light travels in one year. The s: n jqf*y/fb.hcq 3)xkpeed of light /qhkj b3c. y:*) qffnxis $3.00 \times 10^8 \; m/s$. 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 side for+ vijy bzdw1*. 4.0 s, how far do you travel during this inattentive peri* b1zjdvw. +yiod?

  If you run a complete loop around an outdoor track (400 m), in 1004wz4 gtso 8/ -hnmaab) s, your average velom4ng/ thsaobw- z4)a 8city is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km easoau aj o-f1j2kicu,8s- 7 n,8o5ahszi t, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 mic1 s85ans7,j8iuo-ha2jaz,- ioko fun. What was the bear's average speed?

  A polar bear starts at the l)reu3k jo-*cgjc 4(yNorth 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. What was the bear's averaerj *-4(l cj)k3 cogyuge velocity?

  You are driving home on a weekend from school at 55 mi/h for 110lxlvg h30kp/y 5+;-vmype, p o -7vyec miles. It then starts to snow and you; 7vx/0-p3ey5 lovh-mev+p , clgp kyy slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 aj 29yfsplw *j h(8oa2km at 80 km/h and 160 km at 100 km/h. What is the averagef hj8oa(a l9yws2j2*p speed of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.);m lj, .mly spufq2l+hn44qs 0 h at 100 km/h. What is her average . m2y;shjlp l)qs +nqumf4 ,l4speed for the trip?

  An airplane travels at 300 mi/h qm6/bbcnfm,a 8at v7p:o 92jso9 wri zj/(h0i south for 2.00 h and then at 250 mi/h north for 750 miles. What is the a9aaowm 8,ms 6q iop//b(bn zcv j9t7j0:frih2verage speed for the trip?

  In a 400-m relay race the anchorman (the person 3v4jbtxxf g;*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 race, in order that the team A runner not lose the race?fxt3 4jx gbv*;

  A car decelerates uniformly and comes to a *i:mruspl;*4 3w *oy 6tpfano)f0f bu ysp(: kstop after 13 s. The car's average velocity during deceleration was 66 kmu 4pkr*y) 0bo nsowffa 3u:(6sl**ytpi;p :f m/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the average rfu/ b*vw; l,vcate of bfu;vwcl,*/v $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accel/n4twi,ncds q/4 add,6 se8(y u u7ceoerates 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 accelerat8 ymw zzk,yf+hu8d 1z8 c-oao2es 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 svv / +p5taod1a. It then speeds up with a constant acceleration of o/a+dvp5t1va $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 7.7 m/s experiences a consa7xij xs0t 0uclho/ 8pbkb-r2)gio89 tant acceleration o bx/ip h0c0oso2ka 7)b88 l- ixjtu9grf $2.0 \; m/s^2$. What is the cart's displacement during the first 5.7 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a 3zyi iyy.1o,7.dqd wxnl(q;g speed of 383 m/s strikes a gw nyiy.yd z;.x io71(lq3,qdsandbag and penetrates a distance of 55.08 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapul:vx8+ xs k.ju;ho3)tzvboh +k t 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 achh ;vokx+bo3.)kvs x t:jzu8+celeration is constant, what is the length of the catapult?

  A car starting from rest moves with constant accelerav*0 +p*v rrmection 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/ konm 7io.cj(,s to 80 m/s in a distance of 200 m. What is its average accelerationkiomc7j(o ,n. ?

  An object starts from 4m; lbfdk : ep5chh84krest and undergoes uniform acceleration. During the first second it travels 4.7 ;kkb5 44fdc:m hlpeh8m. How far will it travel during the third second?

  An object is moving in a straight line with constant acc 1ekk2a8gj f;*bf xmya5 t0us,zi q(;zeleration. Initially it is traveling at 16 m/s. Three seconds later it is travel emy2t,gijaqf 8 51a szf (b0*kkz;x;uing at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates un( cwkahmk t2: .a)olo l2d/zs9iformly 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 uy4m .uhm rq+,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, a car that has been wait j u1c9za;we0ting at the intersection starts ahead with a consta1t9jwaez 0;uc nt 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 ofmcv liu 2yv,9) 12 m/s on the surface of planet X where the acceleration due to gravity is ) m9vy vlu2ic,$1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a spee: )qn0 (v z:-)vvtd:znq x/fphtoid)bd of 12 m/s on the surface of planet X where thein/tz fo -vn:)(v qdqxvp:d t0)b)h:z 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 pla gln3b-73he-x r k,snlnet X where the acceleration due to gravitn 3 -ksnbh,g 3x-rell7y 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 stx h ;0;b zdlqvo:tl i;d,g*n6urface of planet X where the acceleration due to gravd dx l;;*nq:glottz0bi, h;6vity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually g1ynh)q xze:. treater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far cqzyxt.en1) h :an you expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of up9g dfw6+0 +xi66 4ylqjcrz h19.6 m/s. What is its velocity after 3.006h6 y ip+z4 wu0 d+6q9jcflgxr s?

  A bullet shot straight up returns to its d8gk*fl l(wack g1otq5 ;0(h rstarting point in 12 s. What is the initial speed of the bullet?g8dgk5r*wqla1(kcl0 ; th(of

  A ball is thrown straight up with a g +4)vf (4*m(mvz eaaa:u niygspeed of 36.0 m/s. How long does it take to return to its starting poinva:aye4*mf vu+zg(( mg) a4in t?

  A ball is thrown downward from the top of a building with an initial speedoe46ziy12.s div1e3chq djhm an(jl,h/d)l: of 22 m/s. It strikes the ground after 7.8 s. How high is the,dzdile.ny4se6:1 cq3lv/a 2hh)j h1ijo md( building?

  A ball is thrown straight up with av xs;wgo+7 gb. speed of 30 m/s. (only fill in numerical value in the blanksg +b govxw7.;s)
(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; 0lm 6)qr*tfgtzkte6 a speed of 29.6 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 15 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 15.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the 2cdo.-5pd x* yy.ok ucvelocity at t = 1.0 s?

  In Fig. below, what is the velocity ata8e x zdf8,e/l t = 2.5 s?

  In Fig. below, what is the veloci9o+(*kuo 3drvacbc0g ty at t = 4.0 s?

  In Fig. below, what is the veloci.kafq.d hab4yg 30mb 4ty at t = 5.5 s?

  In Fig. below, what vr(t y.wvo -1kd(dq2 iis the average velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 ti 7pm- 0wrgyd)o 6.0 s?

  In Fig. below, what is the 0)ppovqfic eiaq8/91acceleration at 1.0 s?

  In Fig. below, what is thex/cl(o7ht 7ppx o( w1i acceleration at 3.0 s?

  In Fig. below, what is the average accelerag,8yt3 al-erhtion from 0 to 5.0 s?

  In Fig. below, what is theprwu r woqv);+rcb- 09 average acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement6i+axp(t ut 9j h;np9k from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|velocityim+dk po.r, xh,/.vpo}

  An object can have a varying speeppf 32 qof6)pad if its velocity is constant.

  The velocity of an object can be negative when it2lwddq ocvj(qh +g/7 q8dtf3-s acceleration is positive.

  If one object has a greater speed than a k wa werwi 3h2,4t,wy5n0wdo0 ney ;2rsecond object, the first must have a greater acceler2n03ye;on,wwa,edr4wy w tk 5w ih02ration.

  Two cars emerge side by side from z5n3 9iog )ojsprh7/) ta sw2c3in4zxa tunnel. 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 iheco*pp x230w-j4 s8q pfth;rn speed as its acceleration decreases.

  A baseball player hits a foul ball strai izau zz/l33og 21agga* w/.oight up into the air. It leaves the bat with a spa zo2aia3li1wz/g o.*zug3g / eed 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 sp0lxa7rrpfe *r1l)/bi eeds up, what is happening to its acceleration, how does it change if air f b f)*0irr7 al1pexrl/riction is ignored?

  As a freely falling object speeds up, what is happening to its fjw x36dih0*bit7opekme6/+ acceleration, how does it chang mjtdei /pi6 *x0fhe3k6obw+7e if air friction CAN NOT be ignored?

  An object that is thru5m tsw2 e6sks*r;oi b3btx3:own vertically upward will return to its original position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will thmeix tb;tks3ssbo6r 23*:w 5uis result be altered?

  An object can have zero velocity and nonzero acceleration at the sametzdke0+ 30d;tyj*m) zddvi+d time.

  An object can have nonzero velocity and zero acceleration at tzix,v(eqasc1 2m3k47t,m qz nhe same time.

  An elevator moving from the second floor to the fiftht b1j- l-.ffkw floor making no stops along the way has zero j.wfb tl-f-1k acceleration all the time.

  A rolling ball moves from i6q7s vm-5pe egq-ib ee82p5j$x_1=3.4 \mathrm{~cm}$ to $x_2=-7.5 \mathrm{~cm}$ during the time from $t_1=1.5 \mathrm{~s}$ 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 $t_1=-2.9 \mathrm{~s}$ is at $x_1=2.0 \mathrm{~cm}$ and at $t_2=4.2 \mathrm{~s}$ is at $x_2=8.5 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight compue yt8wr98 ctkh5px9+lete laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 6.4 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from iny(o,u/4qm tpts trainer in a straight line, moving 106 m away in 12.6 s. It then turns abruptly u4,m n/oyt(pqand 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 fromks:-fkqjz(bd m0/bi, r2 ,skeh5q b5g $12 \; m/s$ to $24 \; m/s$ in 5.6 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 fro9-kkktzvj tyr /o.djqr)80h * sbda 2p+cf4)v m $17 \; m/s$ to rest in a distance of 74 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must rea hyop8q8 t *3dqu -c;eqguk+m)ch a speed of $31 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.8 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst s54v8.szuq00 kaznm.-tac3 esw -z l+3w xcqiout of the blocks to essentially top speed about a.3l zmc-s-5 i.wv +zqaszct0 4nxu q0e3skw8$10.7 \; m/s$ in the first 13.9 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 fromc ix4t1dn2s9s/po m vh78aci1 a speed of $18 \; m/s$ to rest in 4.09 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 ther9rcwq5dx 1vrgpztgnk5 q 2:m: 6 y/+e highway. Assuming a+x5gezw:gr169nr 5mq:dq v yp/ck r2t deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goinx8k8x:z3+6 kb-aruizt/ap t v7y xz i)g $25 \; m/s$ 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 am-n 8:ql jmsj*)mzz (u:-rqythe 10,000-m run in less than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The ru:u lzjms- ma8r*)qq y-(jzm:nnner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$