Suppose that an object travels frvvd 7cpog,j27r ysq, de,e;5m om one point in space to another. Make a comparison between the displacement and the distance traoy sjrm,dcdv gv;p77,e 2 q,5eveled.

  When is the average velocity of an object equal to the awfs: mq-t 5+minstantaneous velocity?

  A new car manufacturer advertises thn 168 bkur:i0, ezapdvc5ed3cat their car can go "from zero to sixty in 8 s". This ub 0c kve,6 adzn:51ep 8ridc3is a description of

  An object moving in the +x axis experiences an accelerov4su0brg5 rmzx 470h *j gjr4vh a0t0ation of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to ls r:ooaijc8ymh2 0 88the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its accels 8lcmoih8y o8a:2jr0eration.

  Suppose that a car traveling to the West (-x direction) va0s., ys4 z ;ukhx6mnbegins to slow down as it approaches a traffic light. Make a statement concerning its hmk.av,0xsnu; 6ys 4z acceleration.

  Suppose that an object is moving with a constant velocity/up;x :o cp* 49h5tenube1jnv. Make a statement concerning its accelpnu9x 1p4uenbj c/:v;* o t5eheration.

  If the velocity of an obs+o323fn8. bx-kbbob2 kf cw6lur4stject is zero, does it mean that the acceleration is zero? Support your answer with an exa6b3k3tfsf 28ko w+ nuc x .ob2lb4rs-bmple.

  Can an object's velocity chab, :+a a6 vxuwy8,wspdnge direction when its acceleration is constant? Support your ansb: v8, awsw+a,6dy xpuwer with an example.

  Suppose that an object is cgn+ p2a8 pj; gq c18jdpj*6yemoving with constant acceleration. Make a statement concerning its motion with respect to tiaeqgp;j2 1py c8*6cjjd n8gp+me.

  Can an object have increasing speed while its acceleration is devt z dbdc77hc5/ 4(xrgcreasing? Support your answerb(vx/5z7gc4c d7t drh with an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of i3lwy ucp3s9q9 ce. Make a statem93 9cqsyulw3p ent concerning its acceleration.

  Under what condition is average velocity c mk:3i 5mdp9tuxx/: sequal to the average of the object's initial and :xmu i sxtp:m3c5k9d/ final velocity?

  Objects A and B both start at rest. Thoaq/. 0 -)u jbpb4btgjey both accelerate at the same rate. However, object A accelerates for twice the time as objecb t/ 0.jauoqpbb 4j)g-t 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 rasm9qe*k jr0-1 3krw0 +ursypwte. However, object A accelerates for twice *+ mswru 031ypwekr s-jkq0r9 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 wq052 czrb- hrthe absence of friction, which of z0w rhb -25cqrthe following is true concerning its motion?

  When an object is released from rest and fallpdaz4 qpa2 fjeu s28 o i*0s4,x);fyfbs in the absence of friction, which of the following is true concern,f20 faquzyxs8 *p2e)bsj fdop 44ai;ing its motion?

  Suppose a ball is throw3/rk(7zxr ga j;ip zlky.r27 0 rb6vkun straight up. Make a statement about the velocity and the acceleration when the ball reaches the higaj/7zp;b(0l 6zk2g 3kx. ir7uyrvrk r hest point.

  Suppose a ball is thrown straight up. What is its ..5.m9dnh k p d7qqa8lm py;fzacceleration just before it reaches its highest poinaqzlm.ykn7; df.58d 9 pp hm.qt?

  Suppose a ball is thrown straight up, reaches a maximum height, then pp;//aa zhl z+pw m.st*p-k,vyh wz; 5falls to its initial height. Make a statement about the direction of the veloci py+ ;-lwwppp/akv ;,hs5*zam .zh/ztty and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height,vm m h 31)ewk6qc*cclviw6+ v. then falls to its initial height.mwvli ck +w*e qc)m613.c6h vv Make a statement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence 41wlp b e1oymy4k;d:tof air resistance. Make a statement concerning o:bk4y lt4 dwy1 e1p;mits acceleration.

  Suppose a skydiver jumps from a high-fmu h :ni/.x (bxb uceu(. (,wu9dzly8zlying plane. What is her acceleration when she x(lx,m/ iu.9z(. nyu ezu8wu :bdc(bhshe reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An idaw7r/fjp; +b wentical 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 ba wjf/r7ap w+b;ll? (How many times higher does the second ball go than the first ball?)

  Ball A is dropped from the top of a building. One s 9cl f1f3pdi/iecond later, ball B is dropped from thi19dfpif3 c/l e same building. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One second later, ball B is droppfjkjy79 +, rpb5ccv,ded from the ,7,b+ cj59vkd jcyfrp same building. As time progresses, the difference in their speeds

  Two objects are thrown froqv,j4, oju0abomnf-l b s211tm 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 speeds when they hit tosv 1a2, m 0j uboqb,f4jntl1-he street?

  A brick is dropped from the top of a building. A second brfscs pv0a9,)u ick is thrown straight down from the 9f0psu v) s,casame building. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. The w1rokoo-p)*qi 6rs m 4 ;iiru3position versus time graph of this obj iiork3*)r6; ou -owm s4qipr1ect is

  An object is moving with consta0b7w3 zau lt+k70n wnznt non-zero acceleration in the +x axis. The position versus time graph of this nwk0+u0l7 wanzz7 3btobject is

  An object is moving with constant non-zero velocity in the +x axis. The vxcr;*q,6x t5apox6v5fgb f- g elocity versus,;g5vfo *-f c5 gt6abxxp6q rx time graph of this object is

  An object is moving with constant non-zerop:n p a3l)ykei;ma2,t 6 xw4xk acceleration in the +x axis. The velocity versus time grakte;2ya ailx3)nkw ,x 4:6mppph of this object is

  The slope of a position versus time graph gialsxgd 2h +:as73i khtx9sn:b ms(5 ,mves

  The slope of a velocity versus time v1bd.x6ltc)e graph gives

  The area under a curve mu23 eav rhx*tl h,i6(3z(h +v a,s(poquxqx2 in an acceleration versus time graph gives

  The area under a curve in adnecfiv 6*f; (vin g94b.5q ex velocity versus time graph gives

  If the position versus time oqqomn )67y,a+ g,kifgraph of an object is a horizontal line, the object io7a q n+g6y,mo)kf,qis

  If the position versus time graph of an objec(k*h)u9k i,cjhhy 3xyt is a vertical line, the object is*(y 3hykjx)h,9i hukc

  If the velocity versus time graph of an object is a horizontal line, qi4 ) xi1ccz-8z9ciqb ccru4 +ff+c2h the object iz- u+ii 2c 4cqcz bch cr14+)qc9if8xfs

  If the velocity versus time graph of an object iurtcmt0l ep3c)pw rh2*g d*19s a straight line making an angle of 30 degrees with the time axis, t 9hl *t3u20cdtw1c rgpm*re p)he object is

  An object moves 15.0 m north aig(u ..x8-: lqwwiz hqnd then 11.0 m south. Find both the distance traveled and the magnitude of tuq -xqgz i8:wwl. h.(ihe displacement vector.

  A boat can move at 3)mro8zt- ,h(-f gfj2ewpyn i+ 0 km/h in still water. How long will it take to move 12 km upstrea-z-fi) +o h8pe t,rw 2f(gyjnmm in a river flowing 6.0 km/h?

  55 mi/h is how many mc*1/8psu+c p*ym;gy s1ea cak /s? (1 mi = 1609 m)

  What must be your average speed in order to trave1)lo. gxcf.ofl 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) i :7n-f7mqbnl+bze:is b 0z *gvn 2 hours and 57 min. What is the average speed of the rubn7z m0vi n+bg::slbq- zef*7 nner in m/s?

  A car travels 90 km/h. How long does it take for it to travel 400 k 9msp7(cuc 1hom?

  A ly (light year) is thg/j-m ;yz s+bqe distance that light travels in one year. The speed of light zsbj+/gm- q;yis $3.00 \times 10^8 \; m/s$. 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 na 26 jk1g4ynoand you look to the side for 4.0 s, how f4 1akno6n2 jgyar do you travel during this inattentive period?

  If you run a complete loop around an outdoor track beyqxv)oh 9mp)v,5-a (400 m), in 100 s, your averageq9xvp- y v)ea)5b, hmo velocity is

  A polar bear starts at the North Pole. It travels 1f y ah59,iq62unn-t dy.0 km south, then 1.0 km east, then 1.0 km north, then u y5nhad ,in-9qyt6 2f1.0 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 soux94lnq5: xbd: hbfa k9th, 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 averadfah 5:bq :9xlk4 9nbxge velocity?

  You are driving home on a weekend from schw3yz8e:5hba;gvv gj 2 ool 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 yogvv;b5yj:e28 z h3gawur hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What is theh)z p/hkcj rft5 ho702 average speed of the motorist for this triop/f 7jh 0k2 c5)rzhthp?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is g d9i.h i9psc7her average speed fg9is c.h79pid or the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 2507* wocg:o (ejt mi/h north for 750 miles. What is the average speed forg:w7j eooc* (t the trip?

  In a 400-m relay race the anchorman uur pe)q6qff1n.k *;l(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 Ap1rfuq. lq ekf;6n*) u 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 stopd v3 7xg vg3)ro5y:byv after 14 s. The car's average velocity during deceleration was 36 km/h. What was the car's deceleration while slowing down?:b3r v)5 gvvdxoy73yg

  An airplane increases its speed fron 2q5lnz)x1cj m 100 m/s to 160 m/s, at the average rate of z)2 n qxcj1n5l$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates e3:,,abe35tf:btg kt trk.ng 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 accele8t1orxo rg;-ikv5ilzb 8503h wolr. c rates 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 fo:xmc 0uj p8cykx +o0q4r 10 s. It then speeds up with a constant acceleration xj8yx4 q0p:+oc u cm0kof $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 4.3 m/s experiences a constant y lfq(pd,4- snacceleration of sn qy- 4dp(f,l$3.8 \; m/s^2$. What is the cart's displacement during the first 4.9 s of its motion?

  A bullet moving horizontally to the right (+x dtpxib lj)f2m1g (-hz 8irection) with a speed of 404 m/s strikes a sandbag and penetrate(tl)p-8 1zbx 2figmjh s a distance of 97.25 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult o 0.5b( aksigkkg09 lqxn 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 acceleration ig.ki0als 0b 5q9k(gxks constant, what is the length of the catapult?

  A car starting from rest moves with constant acceleration of*lwj8 (k2m43( puv9m 8hly iuwhin)yn $2.0 \; m/s^2$ 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 /qwm2kfu/wa :uc ;gb(200 m. What is its average accelerat m2/fqgu ucw(bw;:ka/ion?

  An object starts from rest and undergoes uniformaahk -(uerj., acceleration. During the first second it travels 9.5 ma.u(, hj-ar ke. How far will it travel during the third second?

  An object is moving in a straight line with constant acceleratio (e m6bepf3x.ek;(lus;yu*da n. Initially it is traveling at 16 m/s. Three seconds 3e *ea;;fpuk u msy (dex(6.bllater it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates unk f7h:zt3x3 seiformly 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 apyf f+b1wnt/ np1 50ph 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 waiting at the i xzijyz8 lsks.l; 1+d+13l t-oqbjd 8intersection starts 1;q3 l .i zloizd-8sbt 8sxjk+yldj1+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 with a speed of 12 m/s ei bzy73+x k.non the surface of planet X where the acceleration due to gravity z.7ib+x3ek ny 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 planetuc8)y w ,hz-lpf jk(9x X where the a hzjxlk)-p,89wu(y fc cceleration 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 t ubst3gsu7r) /he surface of planet X where the accel 3/s grutub7)seration 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 s5 wyxli44 v l4l60henlurface of planet X where the acceleration due to gravinl44yl6ehvli x 540 wlty is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greate0tcue1z.l8a t ml)3 ryr 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 yoyl80tl1.zamrtu 3ec )u catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. What is its velocity rtq*iaxu + y:(after 3.ir :au+x(y*t q00 s?

  A bullet shot straight up returns to its stai tsr6 zsc2yghf;+5f;gti.4t4ol z1mrting point in 17 s. What is the initial speed o yfz gsrt.c26ohm+5; tg 4lzi;ft4s i1f the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does 4ym0lv+ ni)t )ap,tmm5(bu ywit take to return to+0y4(,lib mm)tm 5tapv )nuyw its starting point?

  A ball is thrown downward from the top of a building with an initial speejz adrrv2d-5 /6*j bnrrbb t 2ktyb3;;d of 7 m/s. It strikes the ground after 6.7 s. Ho5jbb*2tv z ; nyr3/jkdta ;6bbr-r2 drw high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numerical val)4nw0h es)szw ue in the blanks4hwz esns))w 0)
(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 upufe yto34zy fg/t193 b into the air with a speed of 29.3 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 14 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 14.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t = 1.0 lq,fwghr 12nz 2a0sm7lu ty1) s?

  In Fig. below, what is the velocity at t = 2.5 ;ivx-n:i./ ea9f ijeiy(nl6 bs?

  In Fig. below, what is the velocity at t = 5j sonjrb221w4.0 s?

  In Fig. below, what i83mr4 3o ctvcrs the velocity at t = 5.5 s?

  In Fig. below, what is the average velocity from 0 to 4.00efoywcs :s/ y;)8 v 6tgb/aht s?

  In Fig. below, what is the average velocity fromvc*x*s2xyahrz:wk 5 / .m5 ahd 0 to 6.0 s?

  In Fig. below, what is the acceleration +drlxz5fi+6ik/dw;1 k;xyudat 1.0 s?

  In Fig. below, what h id*lgk2k gjs41/s7 lis the acceleration at 3.0 s?

  In Fig. below, what is the0 fnr. pp1lw20wa p/n)xl*ptc average acceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 to 8.0 ss15s uxr ,fyy3 kpz1(fk*8sgj?

  In Fig. below, what -qgrrxvk.z wy7y3 6nh/*l, mfis the displacement from 0 to 8.0 s?

Does a car speedometer measure spo)r. 0 7 i y39s8hxcihvhif1okeed, velocity? {speed|velocity}

  An object can have a varying speed if its veltgv8;evop*p yw wjv(ig) + -d/ocity is constant.

  The velocity of an object can be negativ*vuwrb p)q 6,5wgkx s4e when its acceleration is positive.

  If one object has a greater speed than a second object, the first mus+7y-1 gziepwkt have a greater acceleratioei1 -z yk+w7gpn.

  Two cars emerge side by side from a tunnel. C3e /rw-2em9qh u sjjdrc);db 7ar 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 its acceleration;o0do kf7p6of rmx,.k decreases.

  A baseball player hits a foul ball straight up int)cw b (jis9oqzypiu8)b( 3*bbo the air. It leaves the bat wij*()i) b( ybsuob9z 3qw8ib cpth 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 objert4 ms,4e2 i46hcekoti8 4o xkj/p:dbct speeds up, what is happening to its acceleration, how does it change if air f kmox p 8 4ie4eji4/sr2odkctt64bh :,riction is ignored?

  As a freely falling object speeds up, what is happening to its accelerathdp y; *bnm(s2ion, how does 2p;ndb*ymsh (it change if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return4f6b vvtlp6 dx2o2 g8o to its original position with the same speed as it had initially if air resistance is negligible. If air rexvlbdof o46pv 2g2t68sistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration at the /q o;nikgg ran9/lrt3n6 6nwhd :3zt0same time.

  An object can have nonzero velocity and zero acceleration at the sam +gjzm rdp/. (jdvp/:ze time.

  An elevator moving from the second floor to the fifth floor making no stops acqwk2h3w j vu1+4etq4 long the way has zero accelhv4q4+wk3 jcqweu12 teration all the time.

  A rolling ball moves w yyb7e wwvg1et.+ 0: c:e:yhnfrom $x_1=3.0 \mathrm{~cm}$ to $x_2=-6.9 \mathrm{~cm}$ during the time from $t_1=1.3 \mathrm{~s}$ 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 $t_1=-3.7 \mathrm{~s}$ is at $x_1=3.3 \mathrm{~cm}$ and at $t_2=4.0 \mathrm{~s}$ is at $x_2=7.2 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter-mh)mdc)v* 3cps ile ($1 \; mile = 1609 \; m$) track in a total time of 11.2 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 mdsapmjx( *st)w2k)jhu 5p/3v;:m bw line, moving 114 m away in 12.2 s. It then turns abruptly and gallops halfway back in 4.6 s. Calculate (a) its average sp5bm); w(j*) ukd3ptwv:ssh mp2/m xajeed  (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 fr fx7asp f37d1fp 9a2(*thnyhd)nyb ( wom $11 \; m/s$ to $22 \; m/s$ in 4.7 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 fro)uvx e51 :x-t wx5hrcum $18 \; m/s$ to rest in a distance of 76 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a spen1 xq.zaz gea 62gu2y5ed of $31 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.0 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially top sp(5 pu z6:4p;loekoq, zq shuy)enl*mu6(lw j 4eed about6pn4 ( z;ljelh qumly:s6oew*u4p,)u5ozk(q $11.0 \; m/s$ in the first 13.1 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 adq3m; hs/d 81iv00y : mhcdzdx speed of $19 \; m/s$ to rest in 5.37 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 highwa :sg+u mp6)nksy. Assuming a deceleratkps):g6 +msunion of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truu*ds h gu(i)k2ck 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).    $m$

  A runner hopes to complete the 10,000-m run in less than 30.0 eer)d:o8/0 .wn *ip tsgbmg4bmin. After exactly 27.0 min, there are still 1100 m to go. The runner must d/nem:gtr0)4sbp*g e oi8b w.then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$