Suppose that an object travels from one 7( hgj29osyoa point in space to another. Make a comparison between the displacement and the distance traa9(2 o7sjghoyveled.

  When is the average velocity of an object 0ss4 ciy.f 1uk.jn8nnequal to the instantaneous velocity?

  A new car manufacturera+n3gq m um;sxqil;87 advertises that their car can go "from zero to sixty in 8 s". This is a descripm8qm; xgiq lns 3;ua+7tion of

  An object moving in the + myu rif1ol nqk,ggl/)7vc 6/-x axis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to n0sed*pf4 w+sv5 *tlothe East (+x direction) begins to slow down as it approaches a traffic light. Make a statement co **pl fssd 0tow+5evn4ncerning its acceleration.

  Suppose that a car traveling to the West (-x direction) bk4hhfcy0.2t9 *urra2a cs yfo g,;qq,egins to slow down as it approaches a traffic light. Make a statement concerning its accerhc 9gf0afhs o2*;u,yc ,.t4 aqr2ky qleration.

  Suppose that an object is m v27/v xqxj)fxoving with a constant velocity. Make a statement concerning)vf 7xxqv xj2/ its acceleration.

  If the velocity of an objeg- sm6ge9h o5;5 6,rgdkfu mydct is zero, does it mean that the acceleration is zero? Support your answer with an example.g,6rmg6;o 5dd5kesuh9 m -gyf

  Can an object's velocity change direction when its acceleration is cs /0hsrq t3o4gonstant? Support 03hg/q4sr tsoyour answer with an example.

  Suppose that an object is moving with constant acceleratxw- yht4e6l w,ion. Make a statement concerning its motion with respect to tim x -,4y6helwwte.

  Can an object have increasing dl m6:3w3z ,g,w6 fj+dxrwdgospeed while its acceleration is decreasing? Support your answer with an exampl3dxj ,zdwrgf6om 3g,+:ld6w we.

  Suppose a can, afterr(,lp,3a7tv sjdc xg0u/qa t + an initial kick, moves up along a smooth hill of ice. Make a statement concer0(/j r,+pcalgqvt 3a td x7,suning its acceleration.

  Under what condition is average v5 6s n*94z uhk1zgs). uf. vmn*amlypuelocity equal to the average of the object's initifuh.mms9gv nul1z)sp yuk6.n**4a 5zal and final velocity?

  Objects A and B both start at rest. They both accelerate at the same rate. Howr xe:5 -3kh) :1iiglvhb qs-, gru:qxwever, object A accelerates for twice the time as object B. What is twerq:i1 :i k,hsgx v)u5g:r b3-hl-qxhe final speed of object A compared to that of object B?

  Objects A and B both starky 6xli2aei00v bg34ct from rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is4bev agi l0ki2 xyc630 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 friction, wxkl/ ) :r kqq3wn9u-s)l+orwmhich nuw 9:ro w-)3+rx sk qlqk)l/mof the following is true concerning its motion?

  When an object is released from rest and falls in the absence of friction, w*af4c4 8rov;lsr/3q spn0peqhich of the following is true concerning itsl/0s;*c4nspr q o3pv er 4faq8 motion?

  Suppose a ball is thrown straight up. oqy 1k).b7xpf6 v kr3bp:;zlgMake a statement about the velocity and the acceleration when the ball reaches the highebzl r7 kpqgyb6)o; :k. xvp1f3st point.

  Suppose a ball is thrown straight up. What isqfzx 6m7is/n47 zr3th;ai u l/ its acceleration just before it reaches its highest u4zz7ixmq htf;s6/a/r 7l3ni point?

  Suppose a ball is thrown straight up, reaches a maximum hm gb i-e.3fmq5+)a arteight, then falls to its initial height. Make a statement about the direction of the velocity and 3a a i gqm+r-bmf).t5eacceleration as the ball is going up.

  A ball is thrown straight up,w x.;+y 0x;ffhmu*.y:oqbl lbl*pjd 4 reaches a maximum height, then falls to its initial height. Ma4*;h b yumwll0fq o.y.xl;+d*j:bx f pke a statement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absenceq9q dbk3.ms v8 of air resistance. Make a statement kvd.9qqs 83bm concerning its acceleration.

  Suppose a skydiver jumps from a j7645 x5uqv0xel4t9gsnwopm jw8 5fqhigh-flying plane. What is her acceleration when she s 7own5 q0p5ve sgm4 f4 56wq9tj8uxxljhe reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. Af 5g5f xzwmsa(km2 ve (4/ixc,n 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? (Howsev(5cz, xkmfg /m5if4 2wa( x many times higher does the second ball go than the first ball?)

  Ball A is dropped from the top of a building. One second (eg7 w pz9e;rr5+lct6s/0 :kfq ugpo vlater, ball B is dropped from the same building. As time progresses, the dist5rgqu+vp6e7/frl;eg 9 0wco( :zpkst ance between them

  Ball A is dropped from thzn;-0 jvpzym c keqk8pzj3vv8 x07 1v:e top of a building. One second later, ball B is dropped from the same building. As0j 08;:k-m v8q knzxjz1zpv 73ev pvcy time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One isf9v s .j3-5aogqhx7 vr thrown up, and the other is thrown down, both with the73-v9r 5 ajgs fxhvoq. same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the 79bbe8keo z3d top of a building. A second brick is thrown straight down from the same building. They are released at the same time. zko 83bb97ed eNeglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. m :g23 ef/-eyou5zm luThe position versus time graph of this objectfz oumgyeu5-m /3el2 : is

  An object is moving with constant non-zero acceleration in the +x axis. The ds5tm4tg v 3+zgg0yqpmz8 *q 6position versus time grap0 *d tq8v g+z56g4zyg3mms qpth of this object is

  An object is moving wit v we+f;jh,aium driu0;:u phxt; b*4+h constant non-zero velocity in the +x axis. The velocity versus time graph ofi0hj a:ufwu;+ ,ei;br+vt d4 uh*pxm; this object is

  An object is moving with constantum7hv9y (j 9v ale,iz66 ze:hdtj190*qdkb kb non-zero acceleration in the +x axis. The velocity versus zd v* k:61 kiy lje6hz,9avd(e7b b9j0tq9muhtime graph of this object is

  The slope of a position versus time grakdl4 g 5mcy/lhq f:)4tjx2l 2yph gives

  The slope of a veloc hk 2i qtv5jsl.d2e pl*f-+lf/ity versus time graph gives

  The area under a curve in an acceleration versus time gra y4htp)0mg- wnph gives

  The area under a curve i*8klgy-,e)gg * (hv(m4 *mrbhkfq7rhni 5 zken a velocity versus time graph gives

  If the position versus time graph of a;bo2qs)l 2q wkgur5 :cn object is a horizontal line, the object luck )52 :qg osw;r2bqis

  If the position versus time graph ofg 4k r7 rchn:gbe:a/f6e,0d2z wk q9cg an object is a vertical line, the object isnegc :gk ,d/0ergkwh6b9fa27:zcqr 4

  If the velocity versus time graph of an object is a horizon3r64f:u0dor6pdx5 6rrem lfen chcy*-zv ,f;tal line, the object isndxf p 34refc o;56v0 ur*rm,66lyd-h f cre:z

  If the velocity versus time graa g1g)8sc ae,d.qsml 20*czkwph of an object is a straight line making an angle of 30 1s 8ls,q)*0d.kgceaw m czg2a degrees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m -9 erxkmm k.bz 2wzs67south. Find both the distance travel w7.2rm9ek k6bsxz- mzed and the magnitude of the displacement vector.

  A boat can move at 30 km/h in stilh 00y3p/ucx0ghtb ; ipl water. How long will it take to move 12 km upstream in a river flowing 6.0c/0ipp gx0uty hh3;b 0 km/h?

  55 mi/h is how many m/sel87rkj 4x zf6? (1 mi = 1609 m)

  What must be your average speed in order to trave;f(.-xj h oyvyl 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 x g.nz4h +uj2qmin. What igzhnq4j+. x 2us the average speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to travel 4/u3c*fp7pxk3 v c:faz oy,,sx 00 km?

  A ly (light year) is the distance that light travels in33xfjb3;hpgzl. ln5o one year. The speed of light z;o5nbfj3 hlp3lx 3.g 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 strgt ib(-n3da- jaight road and you look to the side for 4.0 s, how far do you travel during this inattentive paij-b 3(t-ng deriod?

  If you run a complete loop around an outdoor track 33e:(t/otox;bmo rd u(400 m), in 100 s, your average velocityo :;txd3(rob/3 mtoue is

  A polar bear starts at tc 7go ea a;0.*jz(hsf6ns(zyl he North Pole. It travels 1.0 km south, then 1.0 km east,cyfha s6lz*(0n e7sgzoaj; ( . 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?

  A polar bear starts at the North Pole. It travels 1.0 km south, thenj 8d vnsrx;u4rdx9:+o 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 bearru+os;n r:d4vx9j8 x d's average velocity?

  You are driving home on a weekend from sche3.pw;t5of.c:qo afbool at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home. ca.bfteof3:qo;5pw after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km a1+xzj.sigc3l t 100 km/h. What is the average speed of the motorist fol zcjxg31s+ .ir this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 1rv3-fiop8.sn h- a,m34e tilg 00 km/h. What is her averagf-him3i l.a,tsov p-rn384ege speed for the trip?

  An airplane travels at 3g*c x4*n ghyck2h8 qe(00 mi/h south for 2.00 h and then at 250 mi/h north for 78c2ghn4kx(che y *g* q50 miles. What is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 100 m) for teac ) jj(8edksx+m A can run 100 m in 9.8 s. His rival, the anchorman for team B, can k)jjc+ e(dx8s 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 ajculnu51 0 kbw8r q;:after 9 s. The car's average velocity during deceleration was 60 km/h. What was the car's deceleration while slowing down?kurj c;anw5ul:8 1bq0

  An airplane increases its spzkc9 v:7dm- t4 t/atigeed from 100 m/s to 160 m/s, at the average rate of zc tvm/g7: 4ttad9 -ik$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at )9*dfubvknp3eq v)g5 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 accelerates at 4 wt0(axle; 4tg2sls l$4.0 \; m/s^2$ 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 accs9m4 zp :v5us qq9tz hkb93fd6eleratiotzfd:k 653mhqu 9sb q4zs99vp n of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velqj+ a1eind+- gv4u ):ebxosl4ocity of 5.9 m/s experiences a constant acceleration of a1:)4+4 i-+x nolebdsqejgv u $2.3 \; m/s^2$. What is the cart's displacement during the first 5.1 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed of ljn s:vo96w5m l6aqa+ 301 m/s strikes a sandbag and penetrates a dia s lqn65jav6 mow+:9lstance of 50.38 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on )v2,vj x sjs3pm 03jjfan aircraft carrier. It reaches a spj)vmxfss3,j0jj vp32eed 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 witcbmj:ts8rs+7 j/r 8 lwh constant 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 nxd93 ms;au8c;prlo 3 of 200 m. What is its average acceleration?cnol u 8sd;x9a;3r3mp

  An object starts from rest and undedv bqg-13p a cr8k ujy.drbr+7gq1:(vrgoes uniform acceleration. During the first second it travels 6.5 m. How far will it trq83r gky(jvbp.b 7v u -d11+dgq ar:cravel during the third second?

  An object is moving in a straight line with constant acce n qo/hv(luaka 2+nt6:h( lh,bleration. Initially it is traveling at ubv+(a 2naqhlo hn:,ltk/6h (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 unifoxto h e6l0e .eu-:ph5qrmly 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 dem 3pek9 e5frnc72+ shccelerate 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 *un0 j1ms .oydwaiting at the intersection start0y sd.um*n oj1s 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 withrja:/ f- qhuvo bl/:bckr h+g+ xw*p5. a speed of 12 m/s on the surface of planet X where the accelerb /p+rwgxa-b l :jkfc 5+vo.rhuh /*:qation due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward wq00 oy gwt )zcj4q1y2eith a speed of 12 m/s on the surface of planet X where the ayg2q w1j)q04oecty0zcceleration 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 3txngv05j: g dof planet X where the acceleration due3nv5 gtjxg:0d 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 the55k ubtycoc 2- surface of planet X where the accelerc -kb 5o2t5cyuation 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 gret2c+fk rl+zj ffrq,x+s i2)-i/- veyj ater than 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 before yi-ij)z t/lj 2,qfscxr 2 r+ yk+ffev-+ou catch it?

  A ball is thrown upward at a velocity ov se6k,tub;f4f 19.6 m/s. What is its velocity after 3.00fs,; uvtek4b6 s?

  A bullet shot straight up returns to its startizs(qz/en/kp / zkq q(,2/romnng point in 17 s. What is the initial speed of thez(/zn/, qpsz k /2/emnkqro(q bullet?

  A ball is thrown straight up with a speo;zyxpa+tl29s (bv tl+c )+f oed of 36.0 m/s. How long does it take to return to its starting point?za+l 2o ft9)l++pxtb yo(c v;s

  A ball is thrown downward from the top of a buq,3ojk pm7bu*dh0;mb ilding with an initial speed of 20 m/s. It strikes the groun k*,dq;7p mbmhuobj03d after 2.2 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fille .-mkq ,egid2 in numerical value in the .kqeegm-2id, 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 intod4 sr /))m- gr.homeih the air with a speed of 44.4 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 5 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 5.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is ,wp),acn i s1 2m9ubuhthe velocity at t = 1.0 s?

  In Fig. below, what isj4-,akzm bxi- the velocity at t = 2.5 s?

  In Fig. below, what is the velocity at t = 4.0 s)1.quls/ak+zo 0o ws t?

  In Fig. below, what is the velocity at t = 5ctpfad gh:-unu-- mbq3/*z *b.5 s?

  In Fig. below, what is the average velocity fo xzp9(ld9 undv6)*qq rom 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 dc/-3ls /duoo3wo+bj/ mgh a* to 6.0 s?

  In Fig. below, what is the ac 0p)p 4lu1m:qfegjbx,celeration at 1.0 s?

  In Fig. below, what isjq )y; fq):chw j+2,a0mvgowl the acceleration at 3.0 s?

  In Fig. below, what j)uhm6 .6)nri7oabgpis the average acceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 to 5li -ln2: gjw;:u0xreguo s8d 8.0 s?

  In Fig. below, what is the displacement from j9v7g+4 ue,a* j kpozn0 to 8.0 s?

Does a car speedometer measu)i8lzmh+phurz 1 e.o; re speed, velocity? {speed|velocity}

  An object can have a varying spezgd-dtasj68 va.6 0eved if its velocity is constant.

  The velocity of an object can be negative when its accelez la8x j7pj k 1e3vc,u9yi*bhgd6*y(io+-w cpration is positive.

  If one object has a greater speed than a second object, thr8g 7tqmga4 +qe first must have a greater rg+ tq7qamg8 4acceleration.

  Two cars emerge side by side from a tunnel. Car A is traveling witg owttl q1 ;bi(a2u+d;h 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 increasinoc m09z*nyj.*foua:dg in speed as its acceleration decreases.

  A baseball player hits a 51wgdr: 50qkueq0q ;ahh5 yy3zmmb4u foul ball straight up into the air. It leaves the bat with a speed ofyym3h mhzw:de r 0aqb5 5145uu;q0gqk $120 \; km/h$. 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 ;37b pt1 ivogpacceleration, how does it i7 g3pv;o bp1tchange if air friction is ignored?

  As a freely falling object speeds up, ws/vl mar0 .,oumns 6 wp u4a,8ppxmn(0hat is happening to its acceleration, how does it change iwa/um0( 60vsx.4 lmn upm8spn ,ap,orf air friction CAN NOT be ignored?

  An object that is thrown vertically s 2 xsh7yc-en4upward will return to its original position with the same speed as it had initially if air resistance is negligible. If air resistance is 4s c7hyx en-2sappreciable, how will this result be altered?

  An object can have zero velocity and noi g-co ,u+eoew(pl 2 *z6lnw3wnzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at the s ;mbd2 ,th-zkcame time.

  An elevator moving fromvw( gei04nd wyy5jo 1nbkr(1. the second floor to the fifth floor making no stops along the way has zero 1r(b5nonyvyi14 ww dge. (j0k acceleration all the time.

  A rolling ball moves fron4 we9er).ra3y- 7 vd/momdu vm $x_1=2.7 \mathrm{~cm}$ to $x_2=-4.7 \mathrm{~cm}$ during the time from $t_1=1.6 \mathrm{~s}$ to $t_2=5.0 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.8 \mathrm{~s}$ is at $x_1=2.1 \mathrm{~cm}$ and at $t_2=3.9 \mathrm{~s}$ is at $x_2=8.4 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps aroun( d5s4wy1b,1 msyods ad a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.8 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 straight line, moving, sia4g:v:gl3 s,ducn 96 m away in 8.2 s. It then turns abruptly and gallops halfway back in 4.6 s. Calculate (a) its average svi,::sd3ug a gs4n,lcpeed  (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 fro k:ll7ks rt(r1m $12 \; m/s$ to $23 \; m/s$ in 4.5 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 from9gvqrct/ ;kx2 gze;bt,3 fx0u $18 \; m/s$ to rest in a distance of 72 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must re; ig9hwa+/ yhcach a speed of $30 \; m/s$ 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 can burst out of n/6y::eic q gzjx1 kjt hw( y5zy40ug8the blocks to essentially top speed about z n6 wgi8jc xj5qy y1tk::zu/e(hy0 4g$10.4 \; m/s$ in the first 15.0 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 sper)ysz;p 5sb ,.om8ekp:o ng r7ed of $19 \; m/s$ to rest in 5.21 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 m lo 8bsw c(zt/jw6ng on the highway. Assuming a decelj6/wz(bw s8 cteration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goingv:ng3 syspk0 / $25 \; m/s$ 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).    $m$