Suppose that an object travels from one point in space to another. Ma sy0zq+0zvx.p0g 7 u b8wl)ve6atiqe /ke a comparison betweg )qzbtaxv00i z0eeyl/7 sp+ 6u8vwq.en the displacement and the distance traveled.

  When is the average velocity of an object equalrb,.v) +h0lwa javo.i to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to sixtynj54de0j vm,6; l edzk in 8 s". This is a description ofd l0kzjedn65, ej ;m4v

  An object moving in the +x axis experiences an accele4iq hmq ;j-mt6 /s 9haqlh)3noration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+xoz:inqdyt3(kl l*9sw b. mv)r-qh2 fd3gl6c 4 direction) begins to slow down as it approaches a traffic light. Make a statement cqdyqcs9.l 62b4 *t l:(m3ildnrk-hvwofg3 )zoncerning its acceleration.

  Suppose that a car traveling to the West5re etbpztu.fow*nk2mvcy6 ie 4*- ,( (-x direction) begins to slow down as it a,-wzo m y*r6tuce ie5vpn(b2ke *4f .tpproaches a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a consfste /8r4*2eqi5 mrhtj tz 7n2tant velocity. Make a statement concerning its achmizt*t rq t4/2e52 snr 7e8fjceleration.

  If the velocity of an object is zer6(18 c i;hwvmyg zv 5r)on eu)sb91kzoo, does it mean that the acceleration is zero? Support5w)uz1z scvvyo)1e9 (ko6bn 8r;mgi h your answer with an example.

  Can an object's velocity change direction when its acceleratio6e(a i5lc rft/iekm( 2n is constant? Support your answer with ane/fi(kmi(a6 2lc rt5e example.

  Suppose that an object is mobz iu:w8g:g6w9 rzgz)ving with constant acceleration. Make a statement concerning its motion with resr ug)zwzg b:9wz68:gipect to time.

  Can an object have increasing speed while its acceleration is decre j7fot59-wvzg l)2zlyasing? Support your answer with an exatvj9 flyz 5-g7o2 wz)lmple.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice. M ) uw3-zwn r-xvtqfi0)ake a statement co-3vzu0 )-qnwx)rif t wncerning its acceleration.

  Under what condition is average velocixt8p*cfi , vh.ty equal to the average of the object's initial xtc8*ih.,p vf and final velocity?

  Objects A and B both sta a17oar 2xuzg/rt at rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to that of objegu2z1x oaar /7ct B?

  Objects A and B both start from rest. They b(gr6nv-v) hqboth accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by objec6-)qvrngvb ( ht A compared to that of object B?

  When an object is released from restwen1m* /v v6z((oz qwc and falls in the absence of friction, which of the following comenv*qwz/1( 6z( vwis true concerning its motion?

  When an object is released from rest and falls in the abse4buk2mor qz5.:,o1cso kg1q ence of friction, which of th k g.5mqs4,kub1o zrq12ooe:ce following is true concerning its motion?

  Suppose a ball is thrown straight up. Make 7eii 3ce9k c42jd aev.a statement about the velocity and the acceleratiocki7d4ej ea3. cv2ie9n when the ball reaches the highest point.

  Suppose a ball is thrown cp y77ebav,0f straight up. What is its acceleration just before it reaches its higfc , 7yae0p7vbhest point?

  Suppose a ball is thrown straight up, reaches a maximum heigrgc,8lk7 :fpz ht, then falls to its initial height. Make a statement about the direction of the velocity and accelerarc:lg8 k 7fz,ption as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, thndo4b) hjyo8b u)m,0om0l gu 8cxw0, ben falls to its initial height. Make a statement about dhb 0yu 8m40gbc)xjb,ou 8 0onlw) ,mothe direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resi.s zjj-zgpm33fd2* gj stance. Make a statemen j.*3 jp-g z2m3sdzgfjt concerning its acceleration.

  Suppose a skydiver jumps from 1 l 5u9zld:fzfa high-flying plane. What is her acceleration when she she reaches tflfu95:zd l1z erminal velocity?

  A ball is thrown vertically upward wlv51p nx0sv 2nith a speed v. An identical second ball is thrown upward with a speed 2v (twice as fast). l 1 0nsxn25vpvWhat is the ratio of the maximum height of the second 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, td q;j e.mnbc2vw/3m5) 8drivball B is dropped from the sat)8e23mvbvm .i5jd/c wdqr n; me building. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One second later, ball B is dro;bl1,( gabwpnju l(x58 wt qk1pped from the s5(pn ; 8lu(g 1wxb wtlja,b1kqame building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is thrownhm-b 2tesj-tht8p:lhpox b/ ((9z; bd up, and the other is thrown down, bot/ po:thb8dxth l(2;- -9zj mh(psbb eth with 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 b8 4s bavxa 21wrx(4:qska sg*orick is thrown straight down from the same building. They are released at the sameg*a4r ssk: 84a xav1q(xbow2 s time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constlc h 9,x(l7bdpme/ sl2ant non-zero velocity in the +x axis. The position versus time graph of this object i chlb9s7p2 / x,ldm(els

  An object is moving j0:yr47i0ay ly: drpqwith constant non-zero acceleration in the +x axis. The position versus time gr:y0y4ya7:rlr iq p0jdaph of this object is

  An object is moving with constant non-zero vzzm 7,tyal )i-elocity in the +x axis. The velocity versus time graph of this obj)zitlm-a,z 7 yect is

  An object is moving with constant nonl*7qow 4r6gzh or+w lzp q-r79-zero acceleration in the +x axis. The velocity versus time graph ofzoq9+orzrl6w *hq4 7p w l7r-g this object is

  The slope of a positcmdk2 9 ,m4uazne:b 2pion versus time graph gives

  The slope of a velocity ve38n;x url tm9ursus time graph gives

  The area under a curve in an acceleration versus time graph givesd(2ebxg x1ga/8 ygob.

  The area under a curve in a x0m vacxraz*55*3jqi te0ko+velocity versus time graph gives

  If the position versus time graph of)7g-s3; p3nru7fxocerhky ot;s k.,v an object is a horizontal line, the object is;kx,)7v 3-7cno gsypef 3ohksr.u t;r

  If the position versus time graph of an object is a v viow4 ;g+esvhj2 )hw3ertical line, the object isvwj+ igew3o2)s; v4 hh

  If the velocity versus time graph of an object is8fwd;*r,k1 z -w )ubaplrb(us a horizontal line, the object i -bwf rb sr1dzlkpu,)ua(;*w8s

  If the velocity versusl+7dv- e1q vol time graph of an object is a straight line making an angle of 30 degrees with thev1q l+v7- dole time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both tflkr6rz 5f* .hhe distance traveled and the magnitude of the di 5h r*fflz.kr6splacement vector.

  A boat can move at 30 km/h in sqnvs( /g:r ag/till water. How long will it take to move 12 km upstream in a river flowing 6.0 km/as/v(gqr/: ngh?

  55 mi/h is how many m0 ug51k saw5 c o k9l0xgj.xb-ktl(cp4/s? (1 mi = 1609 m)

  What must be your average speed in order to travel 350 km in 5.15vy ),m 0b;(cdv 0-ev0ho bdjao h?

  A runner ran the marathon (approximately 42.ipolopdxr*+ bf 3 p7/wfz35-p 0 km) in 2 hours and 57 min. What is the average speed of the runner i - ppfppdf 3wx /r7i3ooz*+l5bn m/s?

  A car travels 90 km/h. How long does it take u*g m(wbs i pti*eud r08.xv,)for it to travel 400 km?

  A ly (light year) is the distance that light travels in oneu41 v9lbap :n2lhgmtac/ ci/- year. The speed of p:cla49nmtc/b2hl a g/1- vuilight 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 road and you look tovbojp+ m 6o(*y1q f(,yvsfz, e the side for 4.0 s, how far do yoq1+yoevm( 6p o, vf*b,s (zyfju travel during this inattentive period?

  If you run a complete loop around an ou qlgbtccg)hf/xc, j 1y p.1u9jp6v 2-ftdoor track (400 m), in 100 s, your average velocity ish1 cl,cb)1jtugg 9p-j/x yc62fpq.fv

  A polar bear starts at9tkq6,ldz 8 mos/mszo66a;l w the North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km noa lswmlzo ,6d8kzo9m /6tq6s;rth, 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 Polqft .7( bizcs/e. 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 bt s(czi/.qf7. This trip takes 45 min. What was the bear's average velocity?

  You are driving home o - ;3axfl3owjwn a weekend from school at 55 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 far is your hometojl wo;x3 awf3-wn from school?

  A motorist travels 160 km at 80 km/h and 160 km at 1x .ws.brut2i(00 km/h. What is the average speed of t (ixtu2s. rwb.he motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. Wha/)zuszt t49ltsup+ /ft is her average speed for the t /z sttuu9)+p/z4fs tlrip?

  An airplane travels at 300 mi/h south for 2l pd4cqe7 021qdzwkg 1.00 h and then at 250 mi/h north for 750 miles. What is the average spe wlp0z1ged421q 7ckq ded for the trip?

  In a 400-m relay race the anchorman 9olo.3)8p h ce (dumhb(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 fina 9pduhm(.c8lo 3)oeb hl 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 8 s. m- n; 41cxyzplvw7qt; The car's average velocity during deceleration was 34 km/h.w1v pyn lzx ;c;q-4t7m What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at a7z9ldc2lxcf 2rz7 2bthe average rate of c9z7x a2d2zlbl7 rfc2$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 k 0sthfzuj 881m2lbgxi 97qf( qm/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 accelerates atrd hw 8:*d zi9fc2ht)r $4.0 \; m/s^2$ 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 thenj)i a-bz pdh3//g-xsb speeds up with a constant acceleration of /b3s-x jb-hazi) pd/g $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 3.2 m/s experiences a cou o.e v 3nt4bbo*9k,55c*oexk1flppknstant acceleration ofo*tceepbf,kov n kb3 4klou15p 5x9 *. $2.6 \; m/s^2$. What is the cart's displacement during the first 6.8 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed of 555 meem19e,;oa e xyizd 05/s strikes a sandbag and penetrates a distance of 23.66 cm. What is the average acceleration, ino0x y; eei9ae,em 51dz $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrier. 8 .y- fh-*mkzxdtmf pd b90,x:iuq)on It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuxx.,pm:q0fo *h -8yi9u d )znkbf mtd-ming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with c q su0aztjf+mnl r/g,fp *3,s2onstant 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. 32/0yo 5pps:fe0 zsimtdkdo f-)n;oo What is its average acceleration?0smn0fkpti o 5po;)z /:dd-e2o3yfos

  An object starts from resrju(ntk (yzmun/+k3 + e07o tct and undergoes uniform acceleration. During the first second it travels 5.8 m. Ho3c+tu0 +ut/ m eok(7ny r(knzjw far will it travel during the third second?

  An object is moving in a straight line wilw ,o, (qqdrs*th constant acceleration. Initially it is traveling at 16 m/s. ,dw l,o*( qqrs 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 uniformly at v fopnkfd(23 gk(-kjx -i,w,t $3.0 \; m/s^2$. 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 dej 4nox t/1bwn j74.n s+g1ezq +yf iyfz8r-0llcelerate 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+m d dfo; 1vf.fn28jyx green, a car that has been waiting at the intersection starts ahead with x.f 8nfddvjf; o +m2y1a 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(n*/z. drtjnvnr6 y9yww0e / j 12 m/s on the surface of planet X where thyt*zr/ r.n n(dywjj9v/0we n 6e acceleration due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a speed of 12 m/s on the surf5mdhtee)p kbeo(m)/bw2b 0 m6 ace of planet X where the acceleration due t0edke5obp(m )b )b m2/h6m tweo gravity is $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

  An object is thrown upwarh gnf7n n-*fxhm768 ))vrz hyvd with a speed of 15 m/s on the surface of planet X where the acfmv))hn gnvnhh * -76f7xzr 8yceleration 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 pliuzv5p bs*+6w anet X where the acceleration due to gravity iwz5+*p vusi6bs $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greater than 0.10 s. If yo)gu8vf:j icqnww*/: tur friend holds a ruler between your fingers and releases it without warning, how far can you expenwwut*g: : v/fi8)jqcct the ruler to fall before you catch it?

  A ball is thrown upward ak 9j:n7: x5uh r6mflrsyq;w/vt a velocity of 19.6 m/s. What is its velocity after 3.0xj:q mhu/k vf6r:5 lwyns7;9r 0 s?

  A bullet shot straight up returns to its starting point in 6 s. What ehx ;;dv e5qj(*g)h siis the initial speed of t(v h;;gid shj*q5 x)eehe bullet?

  A ball is thrown straight up with 6aoz -obbkt 5nhe6f0)a speed of 36.0 m/s. How long does it take to return to itso56banzoh f0)kb6 -te starting point?

  A ball is thrown downward from the 6k34zcs 9xovjtop of a building with an initial speed of 19 m/s. It strikes thes9c vxo6 4j3kz ground after 3.5 s. How high is the building?

  A ball is thrown straight up wita 0xv r7.ucc:wh a speed of 30 m/s. (only fill in numerical value inc .wua0c: v7xr the 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 into2:xg . rxx e2wj 3p /s*+fd1 yhw;x9ywres/btw the air with a speed of 33.9 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 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 velaol(i)r7k6 c:5yakn m ocity at t = 1.0 s?

  In Fig. below, what is the vel6yzqr m r0z g:i.+nx4cocity at t = 2.5 s?

  In Fig. below, what is the velvd2v a0g, u)sfocity at t = 4.0 s?

  In Fig. below, what is the velocity at t y98i hz572-wo1wntm fcr88t+ xcl. hk 5ggssn= 5.5 s?

  In Fig. below, what is the average velo rilfv- 65vwy-city from 0 to 4.0 s?

  In Fig. below, what is theh aeb. tn93bj p tijia(087q2s average velocity from 0 to 6.0 s?

  In Fig. below, what i/rw z:;wvux*rzteg3 ; s the acceleration at 1.0 s?

  In Fig. below, what is the accelerati, l7r*x y(mmp6p h9nfk 5p5;kuhzfah7on at 3.0 s?

  In Fig. below, what is the average accelery)b+okaz; g um 5+vqo-ation from 0 to 5.0 s?

  In Fig. below, what is the average aasj4b --bkor.y(lz2 v9vi ai nqvh. sw63cv68cceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement9mab34kxqvj)h /alz 7 3hh uo7 from 0 to 8.0 s?

Does a car speedometer;v- 3zyqzq ge(;i4att measure speed, velocity? {speed|velocity}

  An object can have a varying speed if its velocity is con3 j5) iq.mcjv qb7;p:qomwmc+stant.

  The velocity of an object can be negative when its accele1ec pxs6er3+oration is positive.

  If one object has a greater speed than a s4l+vfu:gxo ax.,.ifiqpb : ;tecond object, the first must have a greate .i :xq.vg ,p:aouf f;it4lbx+r acceleration.

  Two cars emerge side by side from a tunnel. Car A is tz u8y2j 9u .jjk9cd4(n8ipxf eraveling 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. r9.gacfajc9 sdbik n.r p 2(m+37suj decreases.

  A baseball player hits a foul ball straight +gajm , ;wch j,vm1c,eup into the air. It leaves the bat with a spee ;jj, emhv,wcg,cm 1a+d 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 eh6q85+4 waxw5 vrd,x qhs9q tacceleration, how does it change if air friction is ignor,9qt854dwra qsvh+xqew 6h5 xed?

  As a freely falling opv2/-qo daai480r c yjbject speeds up, what is happening to its acceleration, how does it cha2 0p4jqoca-dvri/ay8 nge if air friction CAN NOT be ignored?

  An object that is thrsv7dxkt g:gyw9h0s4g2-s l a.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 wls.:g d w9as740sxyg vgh 2-ktill this result be altered?

  An object can have zero velocity and nonzero acceleration at the same time9qn5 ftnel a a:g;2bd2.

  An object can have nonzeru2 8l/q2 br-t-ghlg gao velocity and zero acceleration at the same time.

  An elevator moving from the second floor to the fifth floor making no3j c-+qh;twbm p7za1s stops along the way has zero acceleration all the t7qjz 3a1whc +b;pmst-ime.

  A rolling ball moves from uuet, tvjb/k24li yqx6(s/.7n e)kml$x_1=2.2 \mathrm{~cm}$ to $x_2=-5.5 \mathrm{~cm}$ during the time from $t_1=2.2 \mathrm{~s}$ 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 $t_1=-3.8 \mathrm{~s}$ is at $x_1=3.3 \mathrm{~cm}$ and at $t_2=3.2 \mathrm{~s}$ 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 kk4brvx-mdn ym aog*+987q s9quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 12.2 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away fokjcexh4 t904 3y)jdorom its trainer in a straight line, moving 116 m away in 12.0 s. It then turns abruptly and gallops halfway back in 4.7 s. 04hj4 d3ko)cyjt ex9 oCalculate (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 fron;hn,o g dd 5r2q/z)rwm $12 \; m/s$ to $24 \; m/s$ in 4.8 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 idb xz(;64 rxo$22 \; m/s$ to rest in a distance of 70 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed o8gsw*lw kr:rj9v0: u; nl6vohifyf +kl8yh --f $32 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.4 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of tdye ,-e9(8 a(+ypenyzo :kxa nhe blocks to essentially top speed about(nye8:e -+ax,ka(on ydz9y ep $10.9 \; m/s$ in the first 14.6 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 unif 12ojhw(33uru vmr :vtormly from a speed of $21 \; m/s$ to rest in 5.38 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 m lon /mok wfy+er/sy r).e1g on the highway. Assuming a deceleration of/ y o+f wrmy).e1ser/k $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck8 *7dta8jgmfm 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).    $m$