Suppose that an object travels from one pav -9+bjock*4 y zbaku6iz 9jvpa :2(qoint in space to another. Make a comparison between the displacement and the2 jp9kazcjv q+9u :y (zbikv*bo -6aa4 distance traveled.

  When is the average velocity of an object equal to the instantkl6.ira6f/e4l ls 9q.5xsr jf aneous velocity?

  A new car manufacturer advertises that their car can go "from zero to six)o,n h1wbto hsh7v50l pn.g2x o)pz5uty in 8 s". This is a descr5hpth)2h us )5 .0lonzvo1wob7gn ,x piption of

  An object moving in the +x axis experiences an acceleration ebbgnat .t1cu ,q.,s,of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to m8svk6qn2 px)gd, ;puj 4j)r wthe East (+x direction) begins to slow down as it approaches a traffic k8)nwu; pv x4m)sjrdgjp,6 2 qlight. Make a statement concerning its acceleration.

  Suppose that a car traveling to the Wet aaj1l f0xx32st (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleaf 3xxa2jl1 0tration.

  Suppose that an object is moving with a constant velocity. Ma3*wgu2 t,79noxm qei n*hwo6txfbr49ke a statement concrn,mxitwneq6obuxt7f3 *o2h wg *9 94erning its acceleration.

  If the velocity of anv.5g 13x/ye lati a0lj object is zero, does it mean that the acceleration is zero? Support your anlviaxjt0.a l5/ y31 egswer with an example.

  Can an object's velocityjgj:8 m3xl3se q1-j7;z llook5 ics;x change direction when its acceleration is constant? Support your answer with an examks5-:x 3mx cql7 l;jez8sg;o3 i 1ojjlple.

  Suppose that an object is moving with co/f trgpr9 -qvd*+1leonstant acceleration. Make a statement concerning its motion with respect to time.efod r-9 gq *trp+v/l1

  Can an object have increasing sp 0rjr/w/(gbimeed while its acceleration is decreasing? Support your answer with an examplew(0i/br /mj gr.

  Suppose a can, after an initial kick, mi/ a(x,k3 jnhioves up along a smooth hill of ice. Make a statement concerning its accele3i n,(xak /hijration.

  Under what condition is average velocity equal to the average of t) z0azu aob/y6he object's initial and final velocizb )a/uao 60zyty?

  Objects A and B both start at rest. They both acceleratsux:/j u)8aoqro8kreb.si;d 0jer ) 8 e at the same rate. However, object A accelerates for twice the time as object B. What is the final spjieo;x:ja.)) b8 rok 8sd e u/u0srrq8eed of object A compared to that of object B?

  Objects A and B both start from rest. They both accelerate at the same rate. fl3e k:1d gltdcq.0s/ However, object A accelerates for twice the time asslg:q c0e d 3td1kfl/. object B. What is the distance traveled by object A compared to that of object B?

  When an object is re q1frf1t4krx,p5j e4xleased from rest and falls in the absence of friction, which of the following ir4ff1 q,jtxxp54er1ks true concerning its motion?

  When an object is released from re/v-dmm5lp(:v sq (thkst and falls in the absence of friction, which of theh/-qdp(s (vt5m l :kvm following is true concerning its motion?

  Suppose a ball is throwpw5*q8an 23 zwe7znsin straight up. Make a statement about the velocity and the 52aq7z n3ein*wz8 wspacceleration when the ball reaches the highest point.

  Suppose a ball is thrown straight up. d v7xe/5, rb wh)xu.dd What is its acceleration just before it reaches its highest point?.57ex),hd/dvdwb r xu

  Suppose a ball is thrown straight up, reaches a maxit mqs*q6wk fk*8nz t.2mum height, then falls to its initial height. Make a statement about the direction of the velocity and acceltsf mkz2 n8kq .*6qtw*eration as the ball is going up.

  A ball is thrown straight up, reaches a m;rgtrig p, 0x2yav,c +aximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as ggpr, 2cr+v,;xaty0i the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistance. Make a +ydk plf5.rb pd2b3d7q3wi4b5 pknz9 statemb3 9d lwk2r nqpz5dydp4+3k pi75f.bb ent concerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her ao)1*pn8fyf iw0 cvq2 zcceleration when she she reaco 20f)z *w 1pf8vnqicyhes terminal velocity?

  A ball is thrown vertically upward with a speed v..r zrn: hi3b5q 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 .3nhi5z: qbrr times higher does the second ball go than the first ball?)

  Ball A is dropped from the xlyq eq+f204njghh l43oz-;xtop of a building. One second later, ball B is dropped from the s q02g;l+fon4-hl4z qjxyehx3ame building. As time progresses, the distance between them

  Ball A is dropped from the top of a buildiqjx)geg,dbcl l9 )/+xrg5 5wp ng. One second later, ball B is dropped from the same building. As time progresses, the gg)xb eg)5 jl,xlr/ dcq5+wp9difference in their speeds

  Two objects are throw )hi2( piwz:zln from the top of a tall building. One is thrown up, and the other is thrown down, both with the same ini:ih2 il(z p)zwtial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a buila9lpvk9k9i 0xp-u4- io yyrt2ding. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare t iivpuyrao9 2t4-ly-k p99 0kxhe accelerations of the two bricks.

  An object is moving with c 9dzw2e6gg fg6onstant non-zero velocity in the +x axis. The position versfdwgz egg962 6us time graph of this object is

  An object is moving with constant non-zero acvz k7d2z8fto)celeration in the +x axis. The position versus time graph of this zd8kf)otv 27z object is

  An object is moving wi/7fy r1k30b tj p3diiyth constant non-zero velocity in the +x axis. The velocity versus time graph of this object i dj3fy0ritip7byk 31/s

  An object is moving wit.uma 6smf.9sqh constant non-zero acceleration in the +x axis. The velocity versus time graph of th s.umasmq6f .9is object is

  The slope of a position versus time)ovwgs kgr,;/g3oy k3.:7uh4 glvmrk graph gives

  The slope of a velocity versus time graph -u -8 odylugf.gives

  The area under a curve in an acceleration versus time graph gives;ksklcg6 + aqqp6s* j*

  The area under a curve in a velocity versus time graph give ucmj qvy (5sf+.dviw9mch(1 :s

  If the position versus time graph of an object is5uenv z nj-:*g a horizontal line, the object u- e:jnn5 vg*zis

  If the position versus time graph of an object is a vertical line, thekce q+w9xr2gy /x 5yg- object is gygx5e9 +2x-wykrq c/

  If the velocity versus time graph of fn1 po61hhrq:an object is a horizontal line, the object i:hp6rq 1f nh1os

  If the velocity versus time grajj5o5u6g.,oh 0/ .lo jxnmmi)pc jef1ph of an object is a straight line making an angle of 30 degrees with the time axis, the objemc,hpui l ej1o /.n.5jg xj)oo0fjm6 5ct is

  An object moves 15.0 m nobkue 3)c7 9sowrth and then 11.0 m south. Find both the distance traveled and the magnitude of the displacusoe3wck b97 )ement vector.

  A boat can move at 30 km/h in still water. How 2 4 i/m+lsuwslagl;0u long will it take to move 12 km upstream in a river flowing 6.0 km/h?4/ll+ i0 sgw2l sauu;m

  55 mi/h is how many m/sbjc7. *cdmzonu)v,0 c? (1 mi = 1609 m)

  What must be your average sp 2d -p;j onu( a.x2ylo2mu2aleeed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 mif3pg8arbi acyy(5pu;- g( w;nt6 do(j n. What is the average speed of tp(;5c-;onyf(ajtr8a i (ygdub3 6 pgwhe runner in m/s?

  A car travels 90 km/h. How long does it take for iz6,xwzc :.tm nt to travel 400 km?

  A ly (light year) is the dists4tz.)gm wjvt2yff 77ance that light travels in one year. The speed of lightfft2.7 y7 m)wtsj4zgv 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 roadz8. rsxf1sa-d and you look to the side for 4.0 s, how far do you travel during tfs-rdza sx8. 1his inattentive period?

  If you run a complete lohf-u(g+ rx)m0nvc jr b 5)+nxvop around an outdoor track (400 m), in 100 s, your average velocity b r)njx vn) chr0f(gmux+5+-vis

  A polar bear starts at the North Pole. It travels 1.0 km cg19 hi,nwl0lsouth, then 1.0 km east, then 1.0 km north, then 1.0 km west,9h l1nc0i wgl 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 tn g.p5d lhmjqdbe 9be00q k*8)ravels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km wpdk0lqqe*5 n8 hj.b9bemd0) gest to return to its starting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend fropd1 pyt0o /i3tm 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 minutp10d3ti y o/tpes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 16, i3n,p5c wg53kcfemg0 km at 100 km/h. What is the average speed of th c,mgng55k33wei cpf,e motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 kc0xy; bheb8 n3yu 0ef7m/h. What is her average sp; ehbn 008uxe 73ycbyfeed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h north fo)bc)hy1w ue a*r 750 miles. What is the ec)y 1uba) w*haverage speed for the trip?

  In a 400-m relay racc+zcd(y)0 xxh e the anchorman (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 final cyx0ch( )x+dz 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 10 s. The car's averaennj w.z sfxy;t6(.;tge velocity during deceleration was 79 km/h. Wt; zy.(;n.j xtf6ews nhat was the car's deceleration while slowing down?

  An airplane increases itso*lzj 2azj3.r speed from 100 m/s to 160 m/s, at the average rate of rjl2azj *.3 oz$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/i5e6a 6k):s1wsux3nu z ;yagi c by0g9h 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 +n*f ;wygo(qwody4l4and 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/qq vl*5h +iy 6nh+p+ ;/arimfvs for 10 s. It then speeds up with a constant acceleration of+q5i++q; r6fnphl *i /hmavvy $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 5.0 m/s experiences a z )vsx); ;1aaezxsf.sconstant acceleration ofa ).svsfex;x1z;zs a) $1.6 \; m/s^2$. What is the cart's displacement during the first 9.7 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a spee-je e3l1/keduv 5c7eikrt. 1 c;mqy;pd of 423 m/s strikes a sandbag and penetrates a distance of 33.99 cm. What is the average accelep1em5k1.; /uvy lr-ciq dtc37; eejkeration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrier. It reac*6facxj 3jfax w0 orw,6j/v ;dhes a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is const j6o w*awrjdx,;cxf0 a/6v jf3ant, what is the length of the catapult?

  A car starting from rest moves with constant acceler o,z) ac l5uk(xyi5h(0oxq (ltation 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 z0px* kbwx cup--1 *eqof 200 m. What is its average acceleration w*uxce-xpq-p*b 10zk ?

  An object starts from rest and undergousffq-y.2qpu5)1 vn cs+ lu 6j3 b jnyh8n;p9kes uniform acceleration. During the first second it travels 2.2 m. How far will it travel during the th+5 p up-;k63 nubn lq1y2fjsq 98vc.js )nyuhfird second?

  An object is moving in a straight line with0;axbt t mhjp*p0:qq:t)t w *j constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far doesw:bj 0:p axth0 q)*p;t tjmt*q it move during this time?

  A car starts from rest and accelerates uc+h vg4 6xit(o po0b.( ljd,kiniformly 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 roa lct s,b+ugjyijv+z9b gm 5,;5d 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, my+g rw(pm8 k4a car that has been waiting at the intersection starts ahead with a c(p+yg 4mwrm k8onstant 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 1(f5gp rb; rvt4n)t)9e s sibjjo9o.dthe surface of planet X where the acceleration due tjb5toe 4j1) rs.oids( n99;r)vb pgtfo 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 planqybkynp(qp (2fue. 1( et X where the accelerat1 2(e(y pb .yqpk(fnquion 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 upwarxi8x ttx)u+pnu. ie,zv6m 3 k+d with a speed of 15 m/s on the surface of planet X where the acceleratiip+ )vkx6 ut+z nue.3x,mx t8ion 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 planet X whe65 or;0vyu :sp5khuukre the acceleratv5ks:urko;u yp06 h5 uion 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 ynwn8dq xtuih8m6 8f1/ our friend holds a ruler between your fingers and releases it without warning, how fwu8dtm/ 886iqf1 x nhnar 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 i e71 :cekwzx2jkb8n u)wbna2/:e; gp ats velocity after 3.0kpw 12e gnxj7cbe8;wa ua: )bzke:2/n0 s?

  A bullet shot straight up returns to its starting p yj.u5 je 4+t3/kluuxroint in 19 s. What is the initial s 5u+jl3tj.4ur/ eukxypeed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it j7qt 2 wm:fa:. z5awzltake to return to its starting poiatzjqw7mzlw af2:5. : nt?

  A ball is thrown downward from j. qm; 1gtzkr,the top of a building with an initial speed of 13 m/s. It strikes the ground after 1.1 s. How high is krmz; ,.1tq jgthe building?

  A ball is thrown straight :a+f ft*)gk /9lu 6-r,e3akex*cysdcu4 ofpaup with a speed of 30 m/s. (only fill in numerical value in the aaa4cd :,tp gx9/fko + *ey6fc-eukuf )rsl3*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./keb ccf acuz9som5h9 :c8l 2 into the air with a speed of 35.1 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 7 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 7.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is tuw4x2dw0*w:mmf1 vdi 8my3gdhe velocity at t = 1.0 s?

  In Fig. below, what is the velocity at t ck x0v2; 8k7xc c7nx2may1 p.4sdp dqu= 2.5 s?

  In Fig. below, what is the velea/zffned.9 , +qj*gdocity at t = 4.0 s?

  In Fig. below, what is the veg yz1,0q lcy,clocity at t = 5.5 s?

  In Fig. below, what is the average velocity from smm 0nn( ,7pt3ps v7up0 to 4.0 s?

  In Fig. below, what is the av 7;wd/rv: /z/oohnfdt erage velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleragiw 4hc o8i2)wtion at 1.0 s?

  In Fig. below, what is the acceleration at 3.9)r (mbi+q2ou ii3jbz * r3isx0 s?

  In Fig. below, what is t3mp9v 6vzp 4jz,;awcsko +ar0he average acceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration fro p/ko6 kllq/(am 0 to 8.0 s?

  In Fig. below, what is the dispbc hp,w66 merhk*s7jxp +3c2gy4l zh9lacement from 0 to 8.0 s?

Does a car speedometer measure spee q6etf0/i/ ixbswz/2w d, velocity? {speed|velocity}

  An object can have a varying speed if its v kzj 3,ljomet zca-7//ida5z1elocity is constant.

  The velocity of an object can be negative when its acceleration is :uex- avhay)9p/5(m 5s1ymttlrs s6v positive.

  If one object has a greater speed than a second object, tf m5p5lky pb2;m w+6vohe first must have a greater acceleration.kb55 vp lw6py+2o fmm;

  Two cars emerge side by side from a .;2umv p7.* dcrq oxvktunnel. 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 decreases/fo .eycm c+ vp/ l;eha4(bi*x.

  A baseball player hit dswv..f*b o:as a foul ball straight up into the air. It leaves the bat with a v:bsw..oda f* 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 object speeds up, what is happening to its acceleratj;9oq wrfg xw nb+g3-20c.w+4lufm bvion, how does it change if air frivjr -obfmq; w uc9+ 02xwlb4nfwgg. +3ction is ignored?

  As a freely falling object kjt 23dbhl+ mj*6,zxj 3kh yz/speeds up, what is happening to its acceleration, how does hm h jlkdj t,b2*3x3+/zky zj6it change if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its originalqmbzz5qt9k/6 position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will thqzq9btm/ 5zk6is result be altered?

  An object can have zero velocity and nonzero acceleratia 73au.4spi bgon at the same time.

  An object can have nonzer es -mn0zhip5.m)hr5ro velocity and zero acceleration at the same time.

  An elevator moving from the second floor to the fifth floor making no stops al2w )1j: dqrzf8gp;r xb8 8mmbtong t 8q: mjbb8r1rxpt zmg)d;f82w he way has zero acceleration all the time.

  A rolling ball moves from 4 ctjhp3zt0o;7cw: pi $x_1=1.6 \mathrm{~cm}$ to $x_2=-5.2 \mathrm{~cm}$ during the time from $t_1=2.5 \mathrm{~s}$ to $t_2=5.1 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.5 \mathrm{~s}$ is at $x_1=2.7 \mathrm{~cm}$ and at $t_2=4.1 \mathrm{~s}$ is at $x_2=7.5 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a2j, s +c da/*x,)uxpqz w.vbkm quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 6.7 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 87 m away in 1 ur7x4 twj8a2g1.3 s. It then turns abruptly and gallops48wa 2grxt uj7 halfway back in 4.5 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 from u h6m ilv88li9$11 \; m/s$ to $24 \; m/s$ 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 frohwlu4 7u(( jz:k(zvfvda)s7 lm $20 \; m/s$ to rest in a distance of 83 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a v9ya ;7xrjjr b 3tly57speed of $26 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.7 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of thx2)d)d (o4tn-jcqy k z kyx*qu:r c,*5p r;kwge blocks to essentially top speed about,rdjk4pz xcxk) *cwy: no5 dq)yuqk;gr2t(-* $10.7 \; m/s$ in the first 13.6 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 uniformly from a speed f5+f )nd.z wfr3w-ukmof $20 \; m/s$ to rest in 4.62 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 highway. Assuming +nds*.+ b7qgiyxtmocl 2:p6t a deceleratiy7+.gstlq*6xm:bp to 2 dn+cion of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truc+lhpbo o:v- 9ydlf8.pk 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;s,svi gn0u6tk4- hyt 10,000-m run in less than 30.0 min. After exactly 6g40,ksi ;-sntyhvtu27.0 min, there are still 1100 m to go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$