Suppose that an object travels from one point in space to another. Make a comsevo/ez, e0 q7parison b,e os70eqvz/e etween the displacement and the distance traveled.

  When is the average velocity of an object equal tk2l*cih n6. dio the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zeroyz,( ff,2cpehlfe c70 to sixty in 8 s". This is a dep fch,2(f e, l7cyez0fscription of

  An object moving in the cjbpiqp)jl/, :u 00q, if:g.no y osy4+x axis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the Eadb;q8 1iv6o uxst (+x direction) begins to slow down as it approachdo6ub;v1iqx8 es a traffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) bui5 je3-2i;v(xj,e6nrweav7o18;bznpu pft egins to slow down as it approaches a traffic liz ,u5je;pne1jv7xepw-8 r;3i6nv oua bf2i t( ght. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make a st;l ;ieendm(tjnx8fc /ls*( .patement concerning its acceleratic*t.m8 e(nnjdl; s(f;/plxi eon.

  If the velocity of an object is zero, does it meangq; h4oaxe +2o that the acceleration is zero? Support+xogqh ;e4oa2 your answer with an example.

  Can an object's velocity change direction v:n2ftjd*; )dfs.s sowhen its acceleration is constant? Support your answer with an exa:f;v.sn2odf *s)jd t smple.

  Suppose that an object is moving with constant acceleration. Make a statemen t,ay7(avg21 s*z,p yz8* vi; frgocwet concerning its motion with respect tar, cg(* zos8vyw1zv tg 7af,piy 2e*;o time.

  Can an object have increasing speed while its acceleration is decreasing? Swvgp uwi2bb(teha 9e7w 1.f98upport your answer wi 1 tgv( fewpa 7h9u2biwb9we8.th an example.

  Suppose a can, after an initial kick, moves up along a smooth hilpgd99eb 0g;xvac7 mh: l of ice. Make apvg0mgbxde97:a9h ; c statement concerning its acceleration.

  Under what condition is average vr;8x* d*;tdv,rl:akxijfpgez9r,w0 elocity equal to the average of the object's initial and finx:,jg ,ved a;t* rlxdw8f9z;p*irk r0 al velocity?

  Objects A and B both start at rest. They both accelerate at *.vk zyv1qdpxezo6/ 3the same rate. However, object A accy *6 qz3z.dvvk/ 1xoepelerates for twice the 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. They both accelerate at the same rate. Hf/:qeiu pnnrj/ 13b 5kowever, object A accelerates for twice the time as object B. What isn/5n bpuqfri: 1je/ k3 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 fo4z5:p8hd szq ;. vurwriction, which of8hsp;.q wr4zz d:v5ou the following is true concerning its motion?

  When an object is released7/ (jekt: e/xk,k+sanw 4yemt from rest and falls in the absence of friction, which of the following is true concerning its mo+k(kj s we7tme/:t n ey/xak,4tion?

  Suppose a ball is thrown straight up. Make a statement about t8enfl+*q5, mdbjq ud:he velocity and the acceleration when thqen+qdj,l 8 d f5m:*bue ball reaches the highest point.

  Suppose a ball is throwwba9y+2(m i 5zeenv,ck4s0c sn straight up. What is its acceleration just before it reaches k imy(29en+s5zce0vs4 caw b, its highest point?

  Suppose a ball is thro6kvp an1it4)kg 9rok:wn straight up, reaches a maximum height, then falls to its initial height. Make a statement about the direcgt :4rkk a1on6 9)kpivtion of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls to its y4jj r vr-m.:yka6*)3k rwlkm initial height. Make a statement about the direction of the veloclw*3:r4k )kj.- vkr y rajmym6ity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in dli)dc n8nb04u68hwm the absence of air resistance. Make a statement concwudd 806hbn84nmc )ilerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her accwvzrv 6)hwlgri6 2jy2r-2 vj- eleration whenw)r rvz-2r62g ivy -jvwl hj26 she she reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical set:e e 1myk 29kh0nd0ldcond ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximhn9dte1k2k0d: m l0ey um 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, ball B is droppj ( -p ix47cgn1njv7en4 2bcxhed from the same building. As timh i4pjcegvcnb nnx1x 7(24 7-je progresses, the distance between them

  Ball A is dropped from the top of a bu s17drbrxm-/2hiv s t*ilding. One second later, ball B is dropped from the sames /m71r-vi2hr t*ds xb building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is ta2a 7mv+fc(vdl5n q+z(bj y 4chrown up, and the other is thrown dowcjv yna+bzm2(l f 7aq5c(v4+d n, both with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top rjc)e5:f*ix f of a building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare th)5:x f fc*iejre accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. The p:e0bg p5w6zoy osition versus time gbog06p y5we: zraph of this object is

  An object is moving with constant nj0 m5 vfp)8)wf49e;tktqba hfon-zero acceleration in the +x axis. The position vpk )8f;btmt5vqejw)ha f094f ersus time graph of this object is

  An object is moving with constant non-zero velocity in the +x axis. Thepw.: r l4a aeob+.4q3ykujt z( velocity v(p.3owb+q4l a. z4ukay r:tejersus time graph of this object is

  An object is moving with constant non-zero mf dh3y*/ag t.acceleration in the +x axis. The velofm3t d/* ha.gycity versus time graph of this object is

  The slope of a position versus time gnr nfljzq+1id0a r -96raph gives

  The slope of a velocity vers *qinaemr*w/ x8. imh7us time graph gives

  The area under a curve in an acceleration versus time graph (xf0m m p4g.pmgives

  The area under a curvyis :+:- jt:;sdtcy sve in a velocity versus time graph gives

  If the position versus time graph of an object is a horizontal lin+wlvgt6i 0a/ we, the object iv0/ai6t+ gw wls

  If the position versus time graph of an object is a vertical c(+d t:o jaxzc- ;*o. aws4vcn6vybv3line, the object is von.x4dwaca*ccz ; bv3+ -(v: os6jty

  If the velocity versus time graph of an object is a ho mq q hk tn/in24qd.;/9wanm.wrizontal line, the object i./t qq a /knw2mmh .w9ndqi;n4s

  If the velocity versus time gra oy3.biq4+jm ua3wiy, ph of an object is a straight line making an angle of 30 degrees with the time axis, the object ib+y ,43. jqumo yai3wis

  An object moves 15.0 m north and then 11.0 m south. Find both the +/jk3 kj5ie.fbb -t exdistance traveled and the mfj+ .x 3e-k5kj ebb/tiagnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long wsc9t9,b a*myfk- sj0xill it take to move 12 km upstream in a river flowing 6.0 km/hs,c0sj *a 9xyb- tmk9f?

  55 mi/h is how many m/s? (1 mi = 16 z4bc)7 cgpx85g9k pk1i6 zkuf09 m)

  What must be your averagerfo8 r9o8/w1p pm hfaa l0s13gol 69wk+ /xazt speed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximam.dh; 2g-to6+9c qm qtrwu,d*x /mnyjtely 42.0 km) in 2 hours and 57 min. What is the average speed of the runner i c;m mj+h9 d,r gy-*/nqtwxouq6dm .t2n m/s?

  A car travels 90 km/h. How long does it take for it to trw ;v1x el)/xuwavel 400 km?

  A ly (light year) is the di klbjkhzs33v. iipn- 5oh:*g ,stance that light travels in one year. The speed of lighv ,bkkgh5pnjzls-i 3* io .:3ht 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 stxi 5rwd/c17 *mfe ks-/s vat8qraight road and you look to the side for 4.0 s, how far do you ta1 xs58def twqcr sm/7 vk-i*/ravel during this inattentive period?

  If you run a complete loop around3 d8j 2z 7c,imqlx nf3x(nv3jj tc80gp an outdoor track (400 m), in 100 s, your average veln j(n 3jz7 gqcl dxcxt832j8i30 v,mfpocity is

  A polar bear starts at the North Pole. ;kc gg)l2c q/+ojf px6It 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 tak/go6 q +xgjck; c2)pfles 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.zbohsh95uq z,huu8i; i0ao85do 49sf0 km east, then 1.0 km north, then 1.0 km west to return tohhzzsbqs8 ioh9fd5o8i o 5;uu,u 40a9 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 d)r+1em4xza1:xioi e uuw)z5miles. It then starts to snow and you slow to 35 mi/h. You arrive h4uxze ix) :ia1or)5m+1u edz wome 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 at 100 km/h. What is the averagb y) .g0+kqmhle speed of thb khlm )+0qgy.e motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What el91mdy w4d da*aa91yis her average speed for the trip?91wm1yda ae d9*daly 4

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi 5mo(et7 n0p(mi.abmq/h north for otqe.(ib 705pn( mm ma750 miles. What is the average speed for the trip?

  In a 400-m relay race the anchorman.17k bqtnd g;q*ca*ru (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 th7.r* guq ;a bkcd*ntq1e 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 car's aver l q pa :6skp;h;fg9s)kot0dk.age velocity during decelerat k;: ktsa;gqp6d f)pko hls0.9ion was 33 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160r-gg +mmc.14con f uv/ m/s, at the average rate of +-mcon g 1mv4/.urcgf$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at thvfli0u s, c2/ ull8rh6e 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 accelerateso9,-oum kn)mn 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 a constant acceleratbi- gznkbs0hv4 j50 t gg59+uzion b+0z9g5v4ts ik0n-jzb5gugh of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial v1otcb 2s,omwqe15t q( elocity of 4.6 m/s experiences a constant acceleration o,5bqqsct2( 1 oe1mwotf $1.4 \; m/s^2$. What is the cart's displacement during the first 8.2 s of its motion?

  A bullet moving horizot 4lww4pc (qb6ntally to the right (+x direction) with a speed of 432 m/s strikes a sandbag and pepwl w4q(4tbc6netrates a distance of 75.34 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carriemni uff)/kbsorf0r15w(d)j6i- 6 inkr. 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 is the length of the catanr0 u/nfki1s)ijw 5fr6i(b -ok) d6mfpult?

  A car starting from res-3qsqkzv* y3ufp u*8dt moves with 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 /ar 4dq f( st(z6l;rs: bh0xwdin a distance of 200 m. What is its average acceleral d6(4sta wzrhdf:0/r(xqs;b tion?

  An object starts from rest and undergoes uniform acc*f*/0 y sv5f0pbq btqgeleration. During the first second it travels 9.5 m. How f*pqs y050fqg*b btv/f ar will it travel during the third second?

  An object is moving in a straight line with constant acceleam.l.:eywgn;(m d. rjration. Initially it is traveling at 16 m/s. Three seconds later it is ..mw ey(ldjm:.ra ng;traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates : j(/-(y msaioguyj:k9xt /du (5zby tuniformly 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 5k pz1)nlfklu -lei*gfmm4d4 dt0s)3 on 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 beena:w hjz 3h8zb 08u)0cqa1 lyre waiting at the intersection starts ahead with a cons3r 0:ea8ua j cl81hbzqwz0y )htant 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 surface of planet X ;v .s0*;cccrnhxm7dlcae 1ba/9sjz 5where the acceleration due c1ja. 7*csbm0es v;x5/ahc9rc zdln; 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 surface of plasivv*40+ma0bs, x4th;bww8kbg9fr m net X whersx4 0;gtvm*8i9fkab ,4 +0wbshwbv mre the 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 a28d7ru+bd;pwyd(; r v tj .evb speed of 15 m/s on the surface of planet X where the accelerati;+tbbevy 2prvd7jru;wd. 8d( on 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 thwn e6c pr-fitml ql6,w-98uk:e surface of planet X where the acceleration du r-cqm6iel :-n k9tlw8f ,w6upe 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 0.10 s. If your fr:-ewqc)uj c aa;wh.r5 iend holds a ruler between your fingers and releases it without warni)er a cq;a wj.hcwu5-:ng, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. What isn;2: vy g4aclz its velocity after 3.04n g:lc zav;y20 s?

  A bullet shot straigc7p4pp/ y*lbin,k1 wty/ei h:u8llw3 ht up returns to its starting point in 18 s. What is the inity kc n 8lwy/l/37pbt1eip : pi4lwh*u,ial speed of the bullet?

  A ball is thrown straight up withea3vvzq c.* n4 a speed of 36.0 m/s. How long does it take to ret ev an.3vc*zq4urn to its starting point?

  A ball is thrown downward from the top of a building9 ,n q0z.*jrm0fkkt3x7tn wxr with an initial speed of 28 m/s. It strikes the ground after 2.5 s. How high is the buildinr93k7xm wj ,t0knt.z*q0frn xg?

  A ball is thrown straight up witnc d) (a *a8g)p4gk tbh-h0l7u e9pvmbh a speed of 30 m/s. (only fill in numerical value in thegva -h)d70 9t4)npb(k*m b elchpua8g 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 into the n-ii tff:8 eh xyylh8(37m w8wair with a speed of 28.4 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 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 velocity at t = 1.0. ( s8ta-kjk9e,gax ezj9at7k4jc c3h s?

  In Fig. below, what o0m-4n xvwvz89r29dxv, srfx is the velocity at t = 2.5 s?

  In Fig. below, what is the velocity m 1atm n-x1y(g mljq h)vr6,7sat t = 4.0 s?

  In Fig. below, what is the velocity at/ib/vpaylgu mp8v7f;(bzy -;, q2 rcl t = 5.5 s?

  In Fig. below, what is the average velocity from 0 to 4. 0y,)bl )yllgtca+ vbrno,xu2ix+2 l40 s?

  In Fig. below, what is the aver+jjf(-ccsor 8 age velocity from 0 to 6.0 s?

  In Fig. below, what is th ch-uy*zpj/9 le acceleration at 1.0 s?

  In Fig. below, what is the acceleratiu1346kl zdtm6dpd* ck on at 3.0 s?

  In Fig. below, what is the average acceleration from 0 w9v)cmlk+q u u:d; fh8to 5.0 s?

  In Fig. below, what is the averaif7u2j+p lg b((khvg 6ge acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 to r2/j el *psw8i8.0 s?

Does a car speedometeq rjt 0 7kowk9q 1klm97sith18r measure speed, velocity? {speed|velocity}

  An object can have a varying speexe. 4so2t.uum d if its velocity is constant.

  The velocity of an object can be negative when its acceleration is powjd-83st3ok g url wdv:h6-n)sitive.

  If one object has a greater speed than a second dlpmos 6;h:a-sa 26b0d0oob f*-hee lobject, the first must have a greater acceahos lopbof0hd;6eel6-: 2da-*s0mbleration.

  Two cars emerge side by side from a tuzg xi da;c2g;5nnel. 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 in speed as itsv/ 4y9m *p5 amc wsdu+s8wlbl, acceleration decreases.

  A baseball player hits a foul ball straight 5rh1prup;bd 3 up into the air. It leaves the bat with a s1dr uhp53r p;bpeed 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 acceleratione/7 yabx4hme95t )ut q, how does9eym4qe t5 /btu xha)7 it change if air friction is ignored?

  As a freely falling object speeds up, what is happening to its acc+px xc1/,ocp4ei 8k xoeleration, how does it change if a1x4+xcpek / ci,op o8xir friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its origina/gxe yl2 .s3ii3iu3c) kgc.rgj8ba v4l position with the k .x giivgb4su3 j.3aci ye/rg)2cl38same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zer+asw:piq.-y7rthw5u o velocity and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acbpf3tt dn2k (,celeration at the same time.

  An elevator moving from the second floor to the fifth fl+,igu2uteskv k,rhs.er + -z(oor making no stops along the way has zero acceleration all the tieuk.se+,, h-z 2(sk+tr urivgme.

  A rolling ball moves fy(94dl nfr)t7wcpv d *rom $x_1=3.2 \mathrm{~cm}$ to $x_2=-8.1 \mathrm{~cm}$ during the time from $t_1=2.6 \mathrm{~s}$ to $t_2=5.3 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.0 \mathrm{~s}$ is at $x_1=2.2 \mathrm{~cm}$ and at $t_2=4.3 \mathrm{~s}$ is at $x_2=7.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps a7cv ;* iss x/3i-q/;o iloakktround a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.0 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 liht u2x ;q1+dthne, moving 116 m away in 9.5 s. It t+hd2t1uq; txhhen turns abruptly 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 fromk3m f ej,pu25qdn1-p s $11 \; m/s$ to $23 \; m/s$ in 5.2 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 glxvivd-i kqn89+e( 6$18 \; m/s$ to rest in a distance of 82 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a ina einw s;f4y ,uf;.2speed of $30 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.5 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out ok53hz1v law pai.8l e+ 0sic3vf the blocks to essentially top speed about c5a1 sl+8l ikv 3v.hie30 pzaw$10.2 \; m/s$ in the first 12.8 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 unixx j(u,5 ;kpp) 8yzrwwformly from a speed of $17 \; m/s$ to rest in 4.23 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car lx 1e-:n/0rjy 5lpkm tpru+k)u eaves skid marks 92 m long on the highway. Assuming a dep k)5 tr-rn:u+ /ykpujlxme01celeration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck b53/b*q0h xq*d x) 2rjoxv(ul 2uebaagoing $25 \; m/s$ 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).    $m$