Suppose that an object travels from one py; jm*b*ni ki7oint in space to another. Make a comparison between the displacemennm*i 7kjy*b;i t and the distance traveled.

  When is the average velocity of an object equal to the instantaneous v2 awc). fqqev(elocity?

  A new car manufacturer adve hue;r 8yk.+n /leqe0ertises that their car can go "from zero to sixty in 8 s". Th hr.l0e+n/e;ek8qy ueis is a description of

  An object moving in the +x axis experiences an acceleration o qocm86krc,k5 a2cc,s f $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to slow do+wc-c3 meilyqy 9-/gewn as it approaches a traffic light.-e yq/wem3lg+9c -yci Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direc386tke cs3hl stion) begins to slow down as it approaches a trk3 stse8l 3h6caffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving withw +bg 90io0ihk a constant velocity. Make a statement con0gh9+ i ob0iwkcerning its acceleration.

  If the velocity of an obje7l;yycz cxkm+ 6/, uajct is zero, does it mean that the acceleration is zero? Support your an;6lz amj+xk/7 c,cy uyswer with an example.

  Can an object's velocity change direction when its acceleration is ;rdb-s34cyjb:vns f5 constant? Support your answer with an examplrc:bd4vsybj; 3 f-5nse.

  Suppose that an object is moving with constant acceleration. w oz*bjsqe1cp/ zd s-k-c-in0f +p16i Make a statement pknzw*j/i o ipcs+1z-c 6-d1q0f- besconcerning its motion with respect to time.

  Can an object have increasing speed while t flv/t* ,k ahlfbh6-y4t)5qb its acceleration is decreasing? Support your answer with an exampl/q6y- f)tal h4fbhl,t5vb kt* e.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice. 4dfd.k -s:qx5v 8avk t Make a statemka5.k s x-:v4 8qdvdftent concerning its acceleration.

  Under what condition is average velocity equal+ b ge64h swb97st6 om:idku*j to the average of the object's init6wts 6h k:uib7emj9o* 4b d+gsial and final velocity?

  Objects A and B both start at re9rte qw fb*4t(7ve (imst. They both accelerate at the same rate. However, object A accelertb7e r9fq4twv*m(ei( ates 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 tcn5, 5urhoknu2m;g9 ,96rebzw- nqbrhe same rate. However, object A accelerates for twice the time as objectburr,9buz2q m5r;9gn6w5 hn kcon,- e 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 o5sn 2dp7z/rjb f friction, which of the following is true concers5 7nzjd2p/ brning its motion?

  When an object is released frompc4 )9fe mpzi0 rest and falls in the absence of friction, which of the i4cf9)zm0e ppfollowing is true concerning its motion?

  Suppose a ball is thrown straight up. Make a k20 sy-fhzq5: it p7vcstatement about the velocity and the acceleration whe5k c: yt7v2isfqzp -0hn the ball reaches the highest point.

  Suppose a ball is thro ( v7ksklf/iy4wn straight up. What is its acceleration just before it reaches itsy 4lki/(v7skf highest point?

  Suppose a ball is thrown straight up, reaches a maximum height, then falls 2ft+qt:s-lri to its initial height. Make a statement about the direction of the velocity and acceleration as the ball i2+ :rtlsqtf-is going up.

  A ball is thrown straight up, reaches a maximum heigh6315r pcfsq fjt, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball f36fr s1q5c pjis coming down.

  Suppose a ball is thrown downward in the absence of air resistance. Make a stal5ldhm +hz-+u (h+g eztement concerning its acceleratiogh+uzmlhdl-zh5( e+ +n.

  Suppose a skydiver jumps from a high-flying pv,ugczo:y.*30 lng vnlane. What is her acceleration when she she reaches terminal vv .vngy ,*:0ugln3zocelocity?

  A ball is thrown verticallyu jujq h2: txpxra8*zll0f..p*0f;yd upward 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 second b*xxhptd0*u jl82y.;j zplf0: q aurf .all go than the first ball?)

  Ball A is dropped from the top of a buildin8 l-4hvo rmhx:8-wfmeg. One second later, ball B is dropped from the same building. As time progressew8f-r4x lhm: vmh8-oes, the distance between them

  Ball A is dropped from the top of a bui6 yoc savj)-1slding. One second later, ball B is dropped from the same building. As time progresses, ts6svc 1j-)oya he difference in their speeds

  Two objects are thrown from the top of a tall buildu. 2meotrb- (wmmt1s ln,1x.ving. One is thrown up, and the other is thrown down, both with th ow tmme12l.bu, -mvxts .n1r(e same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick isp:08jwvq6zu +l -fqn m7hq*fc thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the twvq7qfqfu6j z08 m-lpw*+:nh co bricks.

  An object is moving with consta*wmpah7 n.v tsf:v 9-ka9a 0lznt non-zero velocity in the +x axis. The position versus time gras zf:a.9al *7 a90-w vmnptvkhph of this object is

  An object is moving with constant noy8iwte6+ y7 x4us, odsn-zero acceleration in the +x axis. The position versus time graph of th7 wy+4x,syed6i u8ots is object is

  An object is moving with cons83vh8vjugujr0p: dev2 f7hi5 w/u .wozhn8q)tant non-zero velocity in the +x axis. The velocity versus time graph of this object is)3hqh8rz/2 8w:vj.0 jfv udv ouew75pi8g uhn

  An object is moving with constant non-zero acceleration in td ot1.9vuk o+lhe +x axis. The velocity versus time gtoo+v1 . dk9ulraph of this object is

  The slope of a positionk-hzv/,f3 s5 jhyyc a, versus time graph gives

  The slope of a velocity versus kak6p :q.9c ohtime graph gives

  The area under a curve in an acceleration versus time grap g b3,4p7ehjyww5.9 a mg*ctjrh gives

  The area under a curve in a velocit6r(962 j0sd gheewq jty versus time graph gives

  If the position versus time graph of an object is a horizon9hpbp) tp* jfs 1zfp)p ,p0d0h*8renq tal line, the object isfp1p,p8hth* pq) *p0z9ej fnrps)0 bd

  If the position versus time graph of an ox 8z7r z*et,)xvnsod; bject is a vertical line, the object isz)t8nv s;ozx *d7 r,xe

  If the velocity versus time graph of an object is a horizontal l f a,hcz08g/ovh,q s2db b/wg.ine, the object isbq08 gho hvbgw,,f.zd/a/s2c

  If the velocity versus time graph of an object is a straight line makinml-dpoa+g)-0lv+s w 2jg ;mbe g an angle of 30 degrees with the time axis, the object isbo2 ++js-dm0g lw;pglv) -ame

  An object moves 15.0t 9v 19q6uht 5zs k8yjsziz0e0 m north and then 11.0 m south. Find both the distance traveled and tyvizqe0ksuh 1tz09 z8j t569 she magnitude of the displacement vector.

  A boat can move at 30 km/h in still l1c0wppx) 2gt,dy )ohuy 3l 2r8hvfg8water. How long will it take to move 12 km upstream in a river flowing 6.0 km2ywf8r2dpu1)c3g8xhg t oy lvl, 0ph )/h?

  55 mi/h is how many m/sq-q m71:eegm.eubz7x zpo -d/? (1 mi = 1609 m)

  What must be your average speed in order to travel 350 km in 5.1/r3iqij 0hhjdsy8bfiq)* 2n( 5 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min. Whamg74 ahsq:7/3pdzi q7chpa m :t is the aqg m7 :pa: pd7ica7/4zhhsq m3verage speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to travel hkg8dft- 2(v /1fgewa 400 km?

  A ly (light year) is the distan nn . qofjfe0lu,ai,*4ce that light travels in one year. The speed of l4n i*fuleaqjf , 0o,.night 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 sixp2uoheghi n5fh/t1d 73e+fbcz: ;5 fde for 4.0 s, how far do you travel duc:p /n b;57fo+ zdhxe1fhhg 2ftiu5e 3ring this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, your avi)ulj 2bcygvhc;y+.2eh u: *jerage velocity u.vhgyi2j )*cl+b2 hu ;jc:ey is

  A polar bear starts at the North Pole. It (vr,n hrwk-blk()y kb z089yz 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 average speed? kzw,8yl )kbbr -kyhv0 (n(9rz

  A polar bear starts at the North Pole. vy 0 o3eyne46dtqm ;5 kkhm-e+It travels 1.0 km south, then 1.0 km east, then 1.0 km north, thee635oqye+ykke-mnt d0;4 vm h n 1.0 km west 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 from school at 55 mi/h for 110 milesu) t;g 9wvb;me. 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 youre;;9mvb wt)gu hometown from school?

  A motorist travels 160 km at 80 km/h u4iao/.tp5 cd and 160 km at 100 km/h. What is the average speed of p /a45udc.i tothe motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 k7fnmd/0 1xkilpwad+7 , sl-aum/h. What is her average speed for the trip?pl/0+1faliam-s n wdxku7,7 d

  An airplane travels at 300 mi/h south f hhl;.o:avt:cvgth+5;t/-u 7w qoif wor 2.00 h and then at 250 mi/h north for 750 miles. What is the average speed for the q /c:fh h -wlit5 ugvv:o7h.w;o;a+tttrip?

  In a 400-m relay race the anchoot (+1;zr huybrman (the person who runs the last 100 m) for team A can run zb1y;ut+ or(h100 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 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 139m)qog ipj4x;ey)s j8x kl5o0 s. The car's average velocity during deceleration was 57 km)x gj s e5y k9)0;4mxj8lqioop/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m1zb; t 9d sn-,ob.5vgforq4 oi/s, at the average rate of g v, sro.4n-o f;b95zo bqid1t$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rate o n 4bxn.*zae5z/xrrp12 amf,r f $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from rest and aw:,r 9cu xzn+;x5 xbjpccelerates 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. gqm .;,4 7jabi6yb3za/.wybl asf w k5It then speeds up with a constant acceleratiogz3w y b,7/l.msbba 5yfjiw4 6a ak.q;n of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocita j/ ulmig9y 63n*p2pzy of 3.4 m/s experiences a constant acceleration ogz/ u6lya3i2pm9 p n*jf $2.8 \; m/s^2$. What is the cart's displacement during the first 9.7 s of its motion?

  A bullet moving horizontally to the right (+unpf -r8 1-ckxx direction) with a speed of 351 m/sknpr1-- f8cxu strikes a sandbag and penetrates a distance of 95.12 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 carriboy866lfyy f s :.1ftter. It reaches a speed of 42 m/s at :t.fs66y8yfb l yf1 otthe 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 re42, xhwiwot( s 5:qmkjst 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 in a distance of 200 m. What is z,36(y*bgpr 5lr ul glits average acceleratlyggu*p r53llzb6r,(ion?

  An object starts from rest and undergoes uniform acceleration. rlgr8;2a,d7b*xbc ts During the first second it travebc*;l8g a7r,x s btd2rls 1.8 m. How far will it travel during the third second?

  An object is moving in a straight u8 :hri;v ygd+line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How fyu vr:;+dihg 8ar does it move during this time?

  A car starts from rest and accele2td gx165bfm/ w mnw1trates 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 dec58nmojxjm f b:44 k8zkelerate 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 beeniel2xl 0 yp zdo/*)my5 waiting at the inz*y0d o) / 5xy2epillmtersection starts 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 surface of plane +y4/ *3yabjgct76 cszh)fc vkt X where the acceleration due to agyzvkh )/ * csfcy4btjc7+63 gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a spd0sm.2/ounti,7j gnk ;spuz2eed of 12 m/s on the surface of planet X where the acceleration due to gravity n;ij.togpsnm 7zsd,20/k2 u u 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 the surface of y wa*e0n(6ikvut5b4c planet X where the accelerve b ayc(wu45 k*0t6ination 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 8mq+a; jc3 ujgspeed of 14 m/s on the surface of planet X where the acceleration qjj a3m+;ucg8due 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 frlab+kbxo61k38 ; ncdr iend holds a ruler betwo lcdr;1+n83akb 6xbkeen 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/ktb6k u2e/4 vds. What is its velocity after 3.0b /4kkvd26ue t0 s?

  A bullet shot straight up returns to its starting point in 13 s 3:at dfmuwocx mow *-56d:bs-;c g7ju. What is the initial speed of the 5of6s7 d ao-um-:*3cjc: wgx ;twbmudbullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long dptba e2a42m8 xoes it take to return to its startib4 atpae2mx8 2ng point?

  A ball is thrown downward from the top of a buildwdps4hvq0 3ut m f)v66ing with an initial speed of 29 m/s. It strikes the ground after 7.8 s. Howdtus) f60 q3mp46 vhwv high is the building?

  A ball is thrown straight upa,eomrgl d h ))bmoi2q300o fo+b.d1j with a speed of 30 m/s. (only fill in numerical value in the blai0j .ealm, bdqoof)o0m1) o+dg3b2h r nks)
(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 speed of 34.1 m:a:s 6 qe7wn8gafdh6b /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 13 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 13.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the .eg 26,1 jxdygmk0s0pk)iwdq0dg jg;velocity at t = 1.0 s?

  In Fig. below, what is the velocitie wqzuc*u m:suti7x05:.7t wy at t = 2.5 s?

  In Fig. below, what is the velocity at t = 4.,p t kz vq7 :zjo 4tz(8.ncg)vkxfd6+w0 s?

  In Fig. below, what is the velocity at t = 5.5z gp3m/krx3 (tu;, k4avaybc; s?

  In Fig. below, what is the average velocity from 0 to 4:qv 6uk+ k+udzeob1 +jny/ q(j.0 s?

  In Fig. below, what is the average velokh5yh2rl+jlq.:q-iy city from 0 to 6.0 s?

  In Fig. below, what is the acceleration at 1.0dr8po*i )dcgq.g78 b d s?

  In Fig. below, what is the acceleration at 37x3d hjs0f i0i.0 s?

  In Fig. below, what ipc 7nco0vfq9 q)lfi7 ;s the average acceleration from 0 to 5.0 s?

  In Fig. below, what is khzf)0 s8.kxn i6src9the average acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacemene;(fq4frm ru/ t from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {spee7uuh)dm-q4fvk s- g.kd|velocity}

  An object can have a varying sp9j., ov(+ nca5hwqyez mjj2n 5eed if its velocity is constant.

  The velocity of an or*zf3i)ri k7vbject can be negative when its acceleration is positive.

  If one object has a greater speed than a seco* 1-xcxk97oymt5kl ag nd object, the first must have a greagkxa y*tk1c xo 597lm-ter acceleration.

  Two cars emerge side.l8,h0c0daay bh(xz 3yybq0f-prdc(o2 rw6c by side 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 j6nng0t,8dg 1 g szg5 r8zq+lu9qxtp3 as its acceleration decreases.

  A baseball player hitb(,uj +yhrsntrc0 0)qow(0 mys a foul ball straight up into the air. It leaves the bat with a speed of) 0hy tr,+mu0r(0n csyj ob(wq $120 \; km/h$. 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, whjdb492- y4goo ;jrxy fib2/ht at is happening to its acceleration, how does it change if air friction i dxy/jo92h-fji 2;t4bb4 rogys ignored?

  As a freely falling object speeds up, what is happening to ijx;o;6gm8n6ouzqlo4 gw + 2kots acceleration, how does it change if air friction CAN NOT be ignluow m j onq6z2gko46 g;8x+;oored?

  An object that is thrown vertically upward will return to its original :wko 0zn i/z*sposition with the same speed 0n zizswok/*:as it had initially if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration a:a,/ jw4:(sj8qgq ioj fmbr: wt the same time.

  An object can have nonzero veloo:y3p gf+i p.i*jbad/;hg.5i myx 3dxcity and zero acceleration at the same time.

  An elevator moving frng4bisim9(wli 8 tg 28dlyb.4om the second floor to the fifth floor making no stops along the way has zet4imwngi8 .(i2b lybg4s 89ldro acceleration all the time.

  A rolling ball moves from q v ad0;r3g4en$x_1=2.8 \mathrm{~cm}$ to $x_2=-4.6 \mathrm{~cm}$ during the time from $t_1=1.0 \mathrm{~s}$ to $t_2=6.1 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.1 \mathrm{~s}$ is at $x_1=3.3 \mathrm{~cm}$ and at $t_2=3.5 \mathrm{~s}$ is at $x_2=8.2 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps aro;kvx57b nbbqqi, 6+n iund a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 10.5 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, movngm;t8jelnv -5xis4 ez4s x:. ing 96 m away in 8.0 s. It then turns abruptly and gallops halfway back in 4.4gj4vne-zlt .8i:n5 ;sesxm x5 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 frxi0 g; yx +8xpbiao:87. kvlofom $11 \; m/s$ to $24 \; m/s$ 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 from g6wlw :r/otkt5gk rl -nw,v/ 296kxm t$20 \; m/s$ to rest in a distance of 84 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed ofn ggcfj3;6 *c+lq7zinuz8)fe $26 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.1 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burstkd hs2 lfyborh,,/q2h l)d :w0 out of the blocks to essentially top speed abou) hqo2 h/,kll0ysd:,fr dhwb2 t $10.3 \; m/s$ in the first 14.7 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)hzm:lgrk *qaw5p wh)3 d3dh8 speed of $19 \; m/s$ to rest in 4.20 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 highway1 l w mgo0qvy7dd59igxo :7v8v. Assuming a deceler7omv7 wv08 1v9d:x5gqlg do yiation of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck geke ;tg -l*w2h+0gpde oing $25 \; m/s$ 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).    $m$