Suppose that an object travels fromqg02hxc/qn7 rfe,k , d one point in space to another. Make a comparison between the displacement and the distanc g2cnq k, d7/h,xqefr0e traveled.

  When is the average velocity of an object equal to the o nneocpeal1. bz,153instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zersd* 6nt,7u+p r8 hmzxbo to sixty in 8 s". This is a d bd um,7+px h8tn6s*rzescription of

  An object moving in the +x axis experiences an accelerat;,l ; l0giftl:.rhxneion of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x directiowi*4 m.mfs,p v n :te6vjerpw0 *9yro6n) begins to slow down as it approaches a traffic light. Make a statement concer r m9*w0ji6 ytenr6p4p. *e,fsw mov:vning its acceleration.

  Suppose that a car traveling to the West (-x directig+zwl1t vmsyi (6bp nu6ev2.(on) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleration.l(v. peymi6 1gn(t+ws26uv zb

  Suppose that an object is moving with aj3b-a6;gskill 50zf q constant velocity. Make a statement concerning its acceleralzg3k;lab 5 j q-f6si0tion.

  If the velocity of an object is zero, does it mean that the acceleratbat 1)vqj 6l /4qtao9pgf9gc2ion is zero? Support your answer a t q/j12gg9 4pc9boflaq6)vtwith an example.

  Can an object's velocity change direction when its achh hc45utewt 8w- wf4/celeration is constant? Support your answer withwe4wh h5u4 wc/t8h-tf an example.

  Suppose that an object is moving wgqfx43 0sd/ od): okenith constant acceleration. Make a statement concerning its motion eks4fqo/ n): go0xd d3with respect to time.

  Can an object have increasing speed while its acceleration is decreasi:u /z8rjj8sv xng? Support your answer with an e8v8:x szujjr /xample.

  Suppose a can, after an initial kick, moves up along a smooth h;t 4gh f-md.hwr4qjob 8n y1f0ill of ice. Make a statem04b-1mrjhohtq8 g .f 4nfwyd;ent concerning its acceleration.

  Under what condition1drsc ddqe/n6)0rg (f is average velocity equal to the average of the object's initial and final velocds(n gfd0 r6 )ec/1drqity?

  Objects A and B both start at rest. They zw9+gicd97)nxep7+rc mjd n72:hnrfboth accelerate at the same rate. However, object A accelerates for twnx nrge fn7jcm+wz)r+ci79h2d7 p9: dice the time as object B. What is the final speed of object A compared to that of object B?

  Objects A and B both+l+ /f q,l./x xmqmeio 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 object A compared to that of object B?m+qmlxo f.lx//+,e iq

  When an object is released from rest and falls in the absence of frictior,q .xllnx (a *vev)6on, which of the following x).vvq6nrax,l*o l(eis true concerning its motion?

  When an object is released from rest and falls npv)2(0jvsb0o;o ykm in the absence of friction, which of the)y k 0vombjnv0p (;os2 following is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the velocicst adh(+0h8s9umzic5y.t3 qty and the acceleratio 8yscqdhuc5m+t3 9sai(h t.0zn when the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is itsp(dh7y5jp y58eq j9ig acceleration just before it reaches pjid he55(jpy qg87y9 its highest point?

  Suppose a ball is thrown straight up, reache /kp po7k:ah.fs a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is /7 .fkhp aopk:going up.

  A ball is thrown straight up, reaches a maximum height, then falls to its i*y9 a1afq ,( (yzpn4skfu )tljnitial hei(n 9 jp4,qulastfkzy* y1)af(ght. Make a statement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward ins1/t,oqeo oo9o1 2v wj the absence of air resistance. Make a statement concerning its acceler/o o2qw1o jt9,sveo1oation.

  Suppose a skydiver jumps from a high-flying plane. What is her aqfsw )o (lbghh02+r9u cceleration when she she reaches tersq0ufgh) w l+o2(9brhminal velocity?

  A ball is thrown vertw2 jg;fkw8.a y1w*olw ically 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 second8agkwj*2; 1ow.wf ywl 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 later, ball B is droppi(tvqk20op i2ed from the same building. As time progresses, the dis k(pto2iv 02qitance between them

  Ball A is dropped from the top of a building. One second l*wt ez9h gx/fh.z0zc(s8ay r9ater, ball B is dropped from the same building. As tixa9hs.y09ztz 8r hfzce w* g/(me progresses, the difference in their speeds

  Two objects are thrown from:m9/g ut/f qi)(nh 4optwxr, y the top of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speedw, q:)u mr9ytxhotpgi (//4n fs when they hit the street?

  A brick is dropped from the top of a building. A secon v )jw7m1 sudsz/2z0pmz*/mw xd brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the acce dw j7)/m*z21vwz sums 0z/pmxlerations of the two bricks.

  An object is moving with con *c ,ve ig,q;nhj )42nmmlos eskths y)3i0-0zstant non-zero velocity in the +x axis. The position versus time graph of this object )t eh;0h* mv3jgly2i k sz,scnnqe)i0om4- ,s is

  An object is moving with constant non-zero acceleration in the +x axis.i.)aze h)yz. (il7 bmnhe+y)iib+ +yz The position versus time graph oz7)) i)yl+im e b+ yy+zh .niez.a(bihf this object is

  An object is moving with constant non-zero velocity in the +x axis. The velr ) jz2f-16udzb(c:jhtc ege7 ocity versus time graph of this object h:gjc1z(fb2- j crez u dte76)is

  An object is moving with constant non-zero acceleration indkiz6 +xts5 rw 5pzb(1 the +x axis. The velocity versus rp sx k56w(5zbizdt+1time graph of this object is

  The slope of a position versus time grap7od+l .-olto) 6iq+mcuqj +z dh gives

  The slope of a velocity versus3k5pgn ;4d3n 6 dgtakh time graph gives

  The area under a curve iw0j:m6ywr rzk 5..yqun an acceleration versus time graph gives

  The area under a curve in a velocity versus time qmwtui-,, k zfe2mrx+71 (xi kgraph gives

  If the position versus time graph of an object is a horizontal line, the u)hwl .kdwn9rr.lo -zem7,a0object 9w rmk-d nlhzrw0).o ,7eul a.is

  If the position versu8mxyu pu 06p2j ypa-8rs time graph of an object is a vertical line, the object is8 2 0y68p-myauxuprp j

  If the velocity versus time graph of an object is a horizonsventmnzn ; 6 )+4)bip 0ab0detal line, the object is4b v;)npz6 00)bi edt e+anmsn

  If the velocity versus time graph of an object is a straight l 3/pj 3mzvrt6kz6yep(ine making an angle of 30 degrees witvk(y3pzr3p/e m6jtz 6 h the time axis, the object is

  An object moves 15.0 m north anzt9a5ejk.vz5h - /g qjd then 11.0 m south. Find both the distance traveled and the magnitude of the displacee5 jjgka5/h.zv tq-9 zment vector.

  A boat can move at 30 km/h in still water. How long sc4cb2)mb ac wo25 k4uwill it take to move 12 km upstrbwmsc 25bua 4ok)2cc4eam in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609 c3( u1yzmsb (eac5b(om)

  What must be your average speed in order to travel 3 /bx05sh n fy,ah3bk.o50 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 mizjxslhthp .ll8.h/ 11 iqi*: un. What is tlqhux.: p 1*. is1l t/ji8hlzhhe average speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for iw 51jvs31-sbccht jy6t to travel 400 km?

  A ly (light year) is the distance that light travels in one y:llm3hh0po u0 ear. The speed of light is hm:uo30 pl0lh $3.00 \times 10^8 \; m/s$. How many miles are there in a light year? (1 mi = 1609 m, 1 yr = 365 d.)

  If you are driving 72 km/kv (z otrk9h r /vt+;rm57(f4 4wsurhgh along a straight road and you look to the side for 4.0 s, how far do you travel during this ir(rk9muhw4 ftovg5v7 /z h;4 (krs+trnattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, yo5/k mb04fn/t-fn v7mzsho 4 mtur average veloc7kbmoff4/hv0ms /t-n m4tzn5ity is

  A polar bear starts at the North Pole. It travels i fp;; oxyes;rfn9+a0oft5 n 41.0 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 average speed;fs f nor+exf 054 yopi;;nta9?

  A polar bear starts at the North Pole. It travels 1.0 km south, thap115/q qvew pen 1.0 km east, then 1.0 km north, then 1.0 km west to return t1eq1 aqpv /pw5o its starting point. 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 pvpb4- of() slmiles. 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 schf4bs-v)pl p (oool?

  A motorist travels 160 km at 80 km/h and 160 km at q 3o-spw)pco:,2d gso100 km/h. What is the average speed of the motoristpp)g: oowsd3 s2qoc,- for this trip?

  A motorist travels for 3.0 h at *xz s0 f)(m8u74r;wu kig geqkt4/pta80 km/h and 2.0 h at 100 km/h. What is her average sptg;gm)r/8ap xk4u(s47ifzk*t q we0ueed for the trip?

  An airplane travels at 300 mi/h soutu9p:ztgo+n-g)gh: 8e-m ;vi uzd(cbjh for 2.00 h and then at 250 mi/h north for 750 miles. What is the average speed for the tr 8- (ubvco;mz:gjtg+hdein:)uz- pg 9ip?

  In a 400-m relay race the anchorman (the person who run* w*wn v2 lgqy(joz,(gs the last 100 m) for team A can run 100 m in 9.8 s. His rival, the anchorman for teamy z* o2ggnqj(*,wwv(l 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?

  A car decelerates uniformly and comes to a stop after 12 s. The car's aey/m5cml;4sj( :xns9i b ci) overage velocity during deceleration was 70 km/h. What was the car's deceleration while slowi/o) :c( c j m9lix4bi;s5eysnmng down?

  An airplane increases its speed from 100 m/s to 160 m/s, at thwcg.6fh wc7fn93dmt ;e average rate of c.t dm6hwfc g37fnw9;$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 kwxof:a v8 l,nyv .62ekm/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 accemtrh f21;o9 qylerates 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 h qqh cb-yqpw q;53,w;a constant acceleration oqp3yhq qc;hw; q ,-bw5f $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 1.6 m/s experiences a (qe+inw2 zgz,v. +9aqm h,4czrit9l d constant acceleration ofmt ,+9.wqv(ah cz 4,9 d2rei l+gnqziz $2.3 \; m/s^2$. What is the cart's displacement during the first 4.7 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a vny/q -k)hp u.:i:ppnspeed of 448 m/s strikes a sandbag and penetrat:uv.np/npp )qi :k -yhes a distance of 84.73 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched x9 vwa4u1+e tjfrom a catapult on an aircraft carrier. It reaches a4tv91j wau e+x 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 catapult?

  A car starting from rest moves with constant acceleration of 3 jws,g+ 3daueot9.)i 2dhgynus4 s ;f$2.0 \; m/s^2$ 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 6esyytpeq, -i -3 j5n pz;s3soaccelerati5,sy3;z -3e6ytqs ji pp eson-on?

  An object starts from rest and undergoes uniform acceleratiiwg v9 d*.pe10usrj 7 t*xign7on. During the first second it trpu7vg01 ix*wgds79t i enr*j.avels 9.7 m. How far will it travel during the third second?

  An object is moving in a straight line with constant acwj;m.dczmx5r0v7y ;ik3 xzl7celeration. Initially it is trav i5z x7l7v; myjr 0zmwk;dc3.xeling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates uniformlyuli f7cw9z16l 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 c ,(-mugvnw(sman 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 css02z7)x vzrfar that has been waiting at the intersection starts ahead with z0sx)7z 2vsfr 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/s on the surfau9 d., qyfjoo:ce of planet X where the acceleration due uf.d qoj9y:,o to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown hz) ucg,*s c9ty/ga t3upward with a speed of 12 m/s on the surface of planet X where the acce3/)g hcz,stu at gyc*9leration 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 ug+c;mo: 0 w9 ic 82tiwkmum9dupward with a speed of 15 m/s on the surface of planet X where the acwo8 tciu m9g: u+w9kcd0 ;imm2celeration 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 hh6g-h:v wr nl 4jr;l)a speed of 14 m/s on the surface of planet X where the :);w6j r lngh vhrhl4-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 thah,9up/ qu 6l1egbt j5an 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 fall beforee pu1ablqtu,965 /jh g you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. Whal9u) k9k,-bnkp+nppu;x h ly q 3(zlo/t is its velocity after 3/kz) k ;q l(n3 l-pl +oybh,xpn9ku9pu.00 s?

  A bullet shot straight up returns to it9js )p cz+y 3+3)(hedyvegvmts starting point in 17 s. What is the initial speed of the yh v3s (pe++tjm3d c9)gzv )eybullet?

  A ball is thrown straight up with a speed of 36.0 m/s. Hoc/js(6i4q z mjw long does it take to return to its starting p/j iq6zs(m4jc oint?

  A ball is thrown downward from the top of a building with an initial speenep5rbz d5m6*ea+4 ui 4ip *zqd of 10 m/s. It strikes the ground after 5.7 s. How high is the buiz 5eppba54qi4zu m*er6+n id *lding?

  A ball is thrown straight ur k 8k+b;:rgqup with a speed of 30 m/s. (only fill in numerical value in the brku ;bgr+q 8k:lanks)
(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 w7( .;bh4 /qbd ewf,tkyv0nvzhith a speed of 43.9 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 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 is the velocitybv x /5 3n 9cqdae)kqr0tyva6;(.ljsm at t = 1.0 s?

  In Fig. below, what is the velocity lzca9.t k) m07-atj icat t = 2.5 s?

  In Fig. below, what is th4mes7k-y u.ugxf ns4 9e velocity at t = 4.0 s?

  In Fig. below, what is the velocity aa1e(3 zo;gz mf5rs5t mt t = 5.5 s?

  In Fig. below, what is the average velo74y0 px*qf 0 ycsrz;b-hfjm 9hcity from 0 to 4.0 s?

  In Fig. below, what ibp( :lcoc-2yus the average velocity from 0 to 6.0 s?

  In Fig. below, what isw(g i)h 0skl nse1l+.j the acceleration at 1.0 s?

  In Fig. below, what is the acceleraz6 5y5 w6vj2pttz 5pgbtion at 3.0 s?

  In Fig. below, what is the average acceleratio0*6nzoebz(zi+x hgx/*1pcpvlz v0 c, n from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 to 8.0 s hpip+(g.3;be ottgpm2c,1 blt4t5 ti?

  In Fig. below, what is the displacement from 0 to qy;o0,k(h.ikfrxt 7j brf;+ a8.0 s?

Does a car speedometer meev /sk;6lrc(xasure speed, velocity? {speed|velocity}

  An object can have a varying speed if its velocity is conzkq izd3ilq*gl 8ih-0 -jcw9(stant.

  The velocity of an object can be negative when its acceleg/ 8bqu 4p1vnqration is positive.

  If one object has a greater speed than a second object, the firlw cj2 t09x(rw-yle.t st must have a greater acceleration(x-0t.ew 2lwlycj9tr.

  Two cars emerge side by side from a tunnel. Cebz)qujtm;5njzx .v+ vnfev7t: 6 02 bar 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 incr0 dz6b-qrxu h5easing in speed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It leaves the bat wfzl eq 3j4nbhs6 na*dg vw; r-xj:72u1 :6zrhfbdqx4*us3a ej n2vw1l;-jgn7 ith 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 speedsxe -0n5d5)7-onsws y,yc cmji up, what is happening to its acceleration, how does it change if air friction is iycy x 0ms5e-nn ) s5ci-dw,jo7gnored?

  As a freely falling object speeds up, what is hac *e+ougj5eu7l rp1/y bvn s;1ppening to its acceleration, how does it chang71vyu5ur sn+;*1lpgbj/ee coe if air friction CAN NOT be ignored?

  An object that is thrown vertically ub+ ;pwal (lp;rvjtnv;l:5x d6pward 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 this result bdpv;abjllxtwr 6;: ln(5p+; ve altered?

  An object can have zero velocity and nonzero acceleration at the same time.b:0hzmignbrg s.l0.)

  An object can have nonzero velocity and zero acceleratioh5 j/pkle, fn.n at the same time.

  An elevator moving from the second floor to the fifth floorm2q ,.nb:gryl x xo)6j making no stops along the way has zero accelerati)2bg:nl6.om, y qxrxjon all the time.

  A rolling ball moves h.ed)d,,xioln ao ,*sfrom $x_1=2.6 \mathrm{~cm}$ to $x_2=-6.8 \mathrm{~cm}$ during the time from $t_1=1.9 \mathrm{~s}$ 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 $t_1=-2.6 \mathrm{~s}$ is at $x_1=2.5 \mathrm{~cm}$ and at $t_2=3.4 \mathrm{~s}$ is at $x_2=7.8 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around alc5vs-n;m7 sqy1r4ydvnvf 8 1 quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 6.6 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its trainc/ +o, drw80aiyfr3lp 8r kfs:er in a straight line, moving 91 m away in 13.7 s. It then turns abruptly and gallops halfway back in 4.5 s. Calcpl8fc 3drrr:y/iw+ 0fsa8 k,o ulate (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-cww*u h /+i7yrkxwbc( 66dw c $10 \; m/s$ to $24 \; m/s$ in 5.7 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 w-g uk b,g98br$19 \; m/s$ to rest in a distance of 83 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a2hrxhm(e9a b 5dhqel0fu46 .a speed of $29 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.2 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the block -y gsi .f2wodg/:c g,t:y *yvjxmxr61s to essentially top speed about s-2ijg fdvxgwcx 1:mg oy6ty: r,.y*/ $10.3 \; m/s$ in the first 11.4 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 spr k)ienz84l (lw 4r;faeed of $21 \; m/s$ to rest in 4.19 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. Assut l;zqcc6;/ 8l jhed obxk/92uming a decelerath c8xle6 lq d jk;bco2t;9/z/uion of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck going wohm3bv*. *f piz j8+d$25 \; m/s$ 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 10,0jf*;mhkgu9cpmtz 4 l-vr.27 ayj3gs. 00-m run in less than 30.0 min. After exactly.s*t f g k9a -gvum2ph;7jjm3r .zy4cl 27.0 min, there 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?    $s$