Suppose that an object travels from one point in space to another. 8w*q 5/rz (mwb(lbq/hqswq b5Make a comparison between the displacement and the *qzq5rqwb q( /sbl(/bw 5wh8mdistance traveled.

  When is the average velocity of an objn-/cuzguiw9/pb l t42ect equal to the instantaneous velocity?

  A new car manufacturer advertisent mjss - r,m6lpt,c+:g(qo4js that their car can go "from zero to sixty in 8 s". :sjp +g,solt 6c(m ,mt -r4qnjThis is a description of

  An object moving in the +x axi-p:hn zr;); drkymq *bs experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) be.aj x:x*e0ne,a 67givid x g-jgins to slow down as it approaches a traffic ligj dieg n*xa6 7ax-,j g:v0xei.ht. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x directu f :0eb9xf;hj58aspa ion) begins to slow down as it approaches x08b9ef; afahju 5 s:pa traffic light. Make a statement concerning its acceleration.

  Suppose that an objectk4q09-s dr8ej f7h8oqsl5 cxx is moving with a constant velocity. Make a statement concerning i7h lf8jqrx-s eoxc s5dq48 09kts acceleration.

  If the velocity of an object is zero,8 dz;dhl1s;p1)gk l rk++r9/dlwzs j a does it mean that the acceleration is zero? jp;d z+ga ls/l9 kk )8wsdrhl11;dz+r Support your answer with an example.

  Can an object's velocity change direction when its accel0wski jd 86lj.eration is constant? Support y.i0jls6k j8 wdour answer with an example.

  Suppose that an object is moving withd-at w(y+ dop( constant acceleration. Make a statement concerninpo-t+d(d a( ywg its motion with respect to time.

  Can an object have increasin k;o9jb9p; ljag speed while its acceleration is decreasing? Support your answer with an exajp; l;a9ojbk 9mple.

  Suppose a can, after an iniu9hdhuhgxg0s1x9 e.6 tial kick, moves up along a smooth hill of ice. Make a statement concerning 0sghdu9ex6h x9.ugh1 its acceleration.

  Under what condition is average velocity equal to the average of thd fcp/,,ca1l7jhd o rtmbb443e object's initial and final vejrb p,d 4b/ moa374lcc,fhtd1 locity?

  Objects A and B both start a.f nvl(aaq 21wfiy w(5t 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 obje fawq(vn wlfa5.2iy( 1ct B?

  Objects A and B both start from rest. /lwewmfwwi-1q, f q7- They both accelerate at the same rate. However,m l,w qw1-wqfw- 7efi/ object A accelerates for twice 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 the absence of nmlv 12mepyy03s xpoz 3kz 17*friction, which of txky7p1py nv32 sz1 m*0eozl 3mhe following is true concerning its motion?

  When an object is released from rest and:6+ajpjpt9g26wgwp yp8fss oe89 2ty falls in the absence of friction, which of the following is y9 2t6 sa:+wgpg fpp68jwo2yt ej 9s8ptrue concerning its motion?

  Suppose a ball is thrown straight up. Make a stat( gsro6e 5g:4c/ xzp .d3ibmriement about the velocity and the acce:g6rem4d.igs5/ro3 z( x ibcpleration when the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleg) rb9-xv m+7i1xpjderation just before it reaches its heji7p-v) g+x1x 9dbmrighest point?

  Suppose a ball is thrown straight up, reaches a mn 1x7j*od9k:dd /sbiuaximum height, then falls to its initiasdnd/7o1xkubji*d: 9l height. Make a statement about the direction 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 in r):eql;(q4ui 5cqfi bitial height. qiecf5:r ); u qli(4bqMake a statement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the(n/u9c h(czde absence of air resistance. Make a statement concerning z(ucde ( n/c9hits acceleration.

  Suppose a skydiver jumps from a high-flying plane. Wjyst:jyeo 3p9 x,m5 mh(6) wjdhat is her acceleration when s,hyx3s:d6m (wp 5oj)etjyjm9he she reaches terminal velocity?

  A ball is thrown vertically upward:ourwil + j)w, 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 second ball to that of the first ball? (How many times higher does the secowui+ ,)r l:wojnd ball go than the first ball?)

  Ball A is dropped from the top of a building. One second later, ball B 3pu; mbgyt8-dis dropped from the same b8yd-gbmt ; 3upuilding. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One sjx.a;s. zvd2g econd later, ball B is dropped from the same building. As time progresses, the differejszgv.2 adx;. nce in their speeds

  Two objects are thrown from the top of a tall building. One isz d0f4 ypifu)8ibp, a9 thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when 4pf09, zp d8uiaify)bthey hit the street?

  A brick is dropped from the top of a building. A second bl e vt/ /4dg1ed.pdq+krick is thrown straight down from the same building. They are released at the sp d1/k+e/vd4le.q tdgame time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant nonous 4gv52v ron,b)-a u-zero velocity in the +x axis. The position versus time graph of this objec,4ar-)gb vns o5u2vuo t is

  An object is moving with constant non-zero2-l.ppma8qt4ba it( sj-h9g d acceleration in the +x axis. The position versus taa t-dgbs8th2 q.pi 9mp4l(j- ime graph of this object is

  An object is moving with constant non-zero velocitcwfs+, ;2j4l p s0sr:q 1djv1czj7t tty in the +x axis. The velocity versus time graph of this octj1s ;+720sp v:sqw d1f t4ct, lzjrjbject is

  An object is moving with constant non-zero acceleration in thk-e g d aagz(uz:2kz3:e +x axis. The velocity versus time graph2zk gudz:a(k: gaez -3 of this object is

  The slope of a positio,9*dyn6 ; zaco yel;hys fp9tm0b k73gn versus time graph gives

  The slope of a velocity versus time gp py1/kv0c6 zcraph gives

  The area under a curve in an acceleration versus time graph giopam*k 0 +7:guik p2gaves

  The area under a curvt 6u: euim/iq18 .ldwde in a velocity versus time graph gives

  If the position versus time graph of an object t de(wdj 36;fris a horizontal line, the object isdtwr(ejd6 f;3

  If the position versus d 2xmr2/lmx3+rq(jd ntime graph of an object is a vertical line, the object is2 ndr(23j /+mrdxlm qx

  If the velocity versus time grap*ejfakoe*+ yt43l c*s h of an object is a horizontal line, the object is*koj l 3e*ey4+*fas tc

  If the velocity versus time graph of an object is a strai s-bc25:ne f8o3p 8yoy qvsu*mght line making an angle of 30 degreesuoeov38 b-mns2 : s8f pqc5y*y with the time axis, the object is

  An object moves 15.0 m north and the 9ge ht2rh8y40:twtj:cac t+sd7lg5qn 11.0 m south. Find both the distance traveled and the magnitude of the displacement vee:+9 hgdt w s8t0yta4 t5l :cg2hq7crjctor.

  A boat can move at 30 km/chuu8 umz ark6b5 +.w;0sco:jh in still water. How long will it take to move 12 km upstream in a river flowing 6.0 km/huu m86soa r k+.wjzu5ch;b: 0c?

  55 mi/h is how many m/s? (1 mwb azr: uf*/au5f4nw+ 2cj;efi = 1609 m)

  What must be your average speed in order toa4hhqap(.w :t travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0)tacs nn +dh ;gnd(48h km) in 2 hours and 57 min. What is the average speed of the runner in m/s+ch8;ah)d tn(s dgn4 n?

  A car travels 90 km/h. How long doc2+q0vsy+n qtgyz k qy4v3. (oes it take for it to travel 400 km?

  A ly (light year) is the distance that ligo ,9z* jtwa*essi b73uht travels in one year. The speed of lo*wzasti,j s 9 eb*u73ight 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 to the side vl6( ;ahrv4vo 03v pm5 mht1tafor 4.0 s, how far do you travel during this inatteap(mtvth3v64vhra;lv 10om 5 ntive period?

  If you run a complete loop around an outdoor t:y,kqqh4 u39a alvy39( 2qhsc g6u akmrack (400 m), in 100 s, your average velcvkys9,(:hamq36 aq quu3y2lkah49gocity is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 twygh14(j -rr)w) uhb km east, then 1.0 km north, then 1.0 km west to return to its ))rb4hh1gw wrt (uj- ystarting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at. nq9ya4iuxwh- e1vt8lw23*6 x ad d)fcy8pet the North Pole. 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. This trip takes 45 min. What was the bear's av2ad9 -wtq*81avc ld4f 6ex.h3uy8 ) wetixnpy erage velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 miles. It the,1wdw mkio3nzz+ ps 96pms).jn starts to snow and you slow to +jn,wzs9dm.k)pm6 io spz 31w35 mi/h. You arrive home 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 ave5b cohsi 6(9cilv; (puqz:9dxrage speed of the motorist for this tripxdluz6 ;hcpvs 99( c boq5i:i(?

  A motorist travels for 3.0 h at 80 km/ b*/1(edz iqg g /;yrw/xh:hees5lfk8 h and 2.0 h at 100 km/h. What is her average se /k wh ed5lf;s(*hg/gzqix:eb/ y8r1peed for the trip?

  An airplane travels at 300 mi/h south for 9hv 7add+kz (: c:em40jjpofa2.00 h and then at 250 mi/h north for 750 ekjvj+d(dz c7p0oh9 fa:a: 4m miles. What is the average speed for the trip?

  In a 400-m relay race the anchorman (the 7v*n l,-pu t9.wn5z x-edjypc 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 xd5e luwpp vj-7*tz.9y-, nnc 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 9 mwc6s pe5nsh by 9( aan8b9g931zoe5ts. The car's average velocity during deceleration was 60 km/h. What was the car's deceleration while slowe p zs5m s8gn(a5 t1o699yw3bacenbh9ing down?

  An airplane increases its speed from 100 m/s to 160 m v0pz2hfot6: f/s, at the average rate of ft60 :hzpovf 2$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerate/ ,olr.w spble*:l2zqs 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 re sg os7+h)l(vko7s2 ogst and accelerates 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.fsv o, qx9 nj,ow3:+xw It then speeds up with a constant acceleration of ,o, +v: wj9xwsfxn3qo $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 2.3 m/s experibo ul 03i p;iwhl81bf7ences a constant acceleration o 0bfui 7 pow3ll8hi;b1f $3.5 \; m/s^2$. What is the cart's displacement during the first 8.2 s of its motion?

  A bullet moving horizontally to the right (+x direction) uz1-(dnm s4e vwith a speed of 574 m/s strikes a sandbag and penetrates a distance of 96.27 cm. What is the average acceleration, in ez4v(dm-snu 1 $m/s^2$, of the bullet?

  A jet fighter plane is launce x 11yy:,z8z +evklrghed from a catapult on an aircraft carrier. It reaches a speed of 42 m/s at t11ryke:ve x y,z z8lg+he 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 acceqdk 8ys;09 dej5s*f ialeration 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 s-w/if 74w*0 r9qc u:cgd neqdin a distance of 200 m. What is its average accelerrdudiwc-n 9q*wgec7 s4f q0/ :ation?

  An object starts from rest 4m 5 fhw,1pwdnand undergoes uniform acceleration. During the first second it travels 6.0 m.w,5mfdhp14n w How far will it travel during the third second?

  An object is moving in a straight line with constant acceleration. wz w2vk99// q3mygu ceInitially it is traveling at 16 m/s. Three seconds later it is traveling at9gq/u93 /wvwcykem z2 10 m/s. How far does it move during this time?

  A car starts from rest and acks; lx:x6/v e8gq:2xu+70qdq g flxcncelerates uniformly 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 deceleri-4bm wfpg;du3vyk9fo4 . 5yvate 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 cakpt2j1;m/ w dda3quyzi 9n) vc8vid*.r that has been waiting at the intersection starts1uqi)9ivkamy;j/c8d dw2z*p.t d vn3 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 on the surfai7rv*gi x -(6 dg(ejlcce of planet X where the acceleratg(dveri lg-(xc 7i*j6ion due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with.b ygbig9:ti3s+u2 ik gct., t a speed of 12 m/s on the surface of planet X where the acceleration due to gravity isgi9skigy t +t.,3 .:bbucigt 2 $1.5 \; m/s^2$. 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 sul2z afs7)b)vc3gd rx3 rface of planet X where the acceleration df3 r 3cslx7bva2)gz )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 1wyfv tl8dgl6 0.ap1d6 4 m/s on the surface of planet X where the accelera1t66d.pw8lav gl0yfd tion 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 than 0.10 s. If your friend v-2me wn-dz( u* ne4peholds a ruler be*e-4dv u wenp-m2z(n etween your fingers and releases it without warning, 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 is its velocity af* nre 3dmxv3q,ter 3.0 rn, xme*3dv3q0 s?

  A bullet shot straight up returns to its starting point i corr(72x3yz tn 5 s. What is the initial sptzo rx(c y27r3eed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it tq- tn i6hur7e.n9 a3miake to i 7i.n9rna6muqh3 t e-return to its starting point?

  A ball is thrown downward from the top of a building with bc(k nhy5u9)q- k ;r e:hskf-tan initial speed of 21 m/s. It strikes the ground after 5.6 s. How high; kkc5h)ys9hqt(u:ef -n-kb r is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numerica. c5 o:iym,yii+zjt(ul value in the blanks)(zi,.iuoc: jm+iy5 ty
(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 with a spg kr(s o-x94pseed of 30.9 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 2 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 6 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 6.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what isxe4 )dl2bm0vbw b02o z the velocity at t = 1.0 s?

  In Fig. below, what is the velocit0-8yy mq djxk7y at t = 2.5 s?

  In Fig. below, what is the 2dy xwujd679xn/s-p gbmg h ,0velocity at t = 4.0 s?

  In Fig. below, what is the velocd j9t.ims:dhcj2c rs,w 6:3nzity at t = 5.5 s?

  In Fig. below, what is the average velwx1,x6*3hsof: ww.u37f ul e v ieprc2ocity from 0 to 4.0 s?

  In Fig. below, what is the average vbn:/- dgz 1lxselocity from 0 to 6.0 s?

  In Fig. below, what is thet. u )hmebyp+3czax8 , acceleration at 1.0 s?

  In Fig. below, what is the accelerati 72i dxsyaz+ esikn+4-on at 3.0 s?

  In Fig. below, what is theb. h,ylij;k+ p:ivweh*c29.kv jjsuw 6 8u2vu average acceleration from 0 to 5.0 s?

  In Fig. below, what is thsy;aci 5 gtoxm55e/q7e average acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 tfl z;tig5.)d;2vcrs ao 8.0 s?

Does a car speedometer measure speed, velocity? {speed|vgzg kj:j61v5b,st nr03m qp k3elocity}

  An object can have a varying speed if its velocity is con7zb7*fx+imly stant.

  The velocity of an object can be negative when its k)4cz5jgunc ;1;rfw1p3 w kjaacceleration is positive.

  If one object has a greater speed than a second object, the first must have a gtp5hb frwhe *tr 2j*,.re pj,r*w*.frbt5t h2heater acceleration.

  Two cars emerge side by si+k6c,ffd. x bh coc/g9de from a tunnel. 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 its acceleration decre/qcwghg sz36 f *0) cix wrjz17+bbzz;ases.

  A baseball player hits a foul ball straight up into the air. Itye6nl8 njvj k4 -:s*rx leaves the bat with a speed r468 n :-jelk*vsny xjof $120 \; km/h$. 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 itsiq 4 fh3pemll78f ,9p7ldp;zc acceleration, how does it change ipi8,hfl;pzmldl 7e3qfpc 7 49f air friction is ignored?

  As a freely falling object spe3s a).m do23h bv8saqveds up, what is happening to its acceleration, how does it change if air friction CAN NOT be ignor v3vaoa ) 32ss.mhdqb8ed?

  An object that is thrown vertically upwn 1d 8z qu;k1+0k.4 eqo ed*nhhcqnj/oard 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 oh;oq18 cq.qze nn4udkhk*d n1/je+0 be altered?

  An object can have zero velocity and nonzero acceleration at the y 9 yngy s94la 6wc*5qk(u0putu6 vz9hsame time.

  An object can have nonzero vel9gpigf fo+6xf6 f6yo2 ocity and zero acceleration at the same time.

  An elevator moving from the second floor to the fifth floor mak+od hyz9nz ai;.s2q)jing no stops along the w9a)+yzizh2j on d; sq.ay has zero acceleration all the time.

  A rolling ball movesp: +.oxwe02 yzuggd* t from $x_1=3.4 \mathrm{~cm}$ to $x_2=-6.5 \mathrm{~cm}$ during the time from $t_1=2.5 \mathrm{~s}$ to $t_2=5.9 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.2 \mathrm{~s}$ is at $x_1=2.5 \mathrm{~cm}$ and at $t_2=3.8 \mathrm{~s}$ is at $x_2=7.7 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete lav6j *zv e5n )larfr-27zkqsu.ps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 10.7 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its qx8l/ -pmhxrz 7/3s dgu y)g1btrainer in a straight line, moving 99 m away in 11.4 s. It then turns a xx318) b/m/ghlgq z-7rspud ybruptly 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 frod t d:7c)yakze0zy* i3m $11 \; m/s$ to $23 \; m/s$ in 5.0 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 l t4h-xj1p y9hld7ca)$17 \; m/s$ to rest in a distance of 78 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a sm)/e1qpnl +b hpeed of $26 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.8 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially toi,kh+ lm6*ntp+ ln /2zins b(lr99sf rp speed about/kr+9 zn2tl(i*9 ssnb prnm,6ilh f+l $10.0 \; m/s$ in the first 10.3 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 uniko .sro32ex 4tformly from a speed of $15 \; m/s$ 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 kb/lc7jv:3ewc4h 1yym long on the highway. Assuming a decelj 7e:b k1hwy 3clvc4/yeration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goie4;xnz zsd )q.ng $25 \; m/s$ 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 min. After exactlyse e lthyme, +u:d(.4:ip/ uaw 27.0 min, there are still 1100 m to go. The runner must them, at:.u+4eys(/d pe liwuhe:n accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$