Suppose that an object travels from onem-h m-) ghda0n (wd5 eojpnmd19bt67e point in space to another. Make a comparison between the displacement and the distance travelee7(da) edwmh-- 09go5njnm6p 1mdbh td.

  When is the average velocity of an object equal to the instantas r13jyl:cv i1z29q vaneous velocity?

  A new car manufacturer ey *2z yi;)w 6 t3dnmf.do2x8 sym83lx2zcqeeadvertises that their car can go "from zero to sixty in 8 s". This is a desmnd * y3xwy6emel z83ey.2 f2qx t;cz 28o)isdcription of

  An object moving in the +x axis 1 32k8xzfc.)w;ay:qub uvk cuexperiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling tnk*:ecl7x tosor6 h*m :r7mzn48k 3cho the East (+x direction) begins to slow down as it approaches a traff 34o 7mc:hk7 et 8cznrkm*nslo *6x:hric light. Make a statement concerning its acceleration.

  Suppose that a car traveling mai+qpegi d.pzqf jjx7;3 5/*to the West (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its aa7x; ji*e/ jgi.qfq+zm3p d5 pcceleration.

  Suppose that an object is moving with a const8ku1k8e a:;t 5fdv egiant velocity. Make a statement concerning its acceld8t5k vf: u ea;81gekieration.

  If the velocity of an object is z,o7zzlp67dj.v+ 0s e2eini6prvjvsk5 0 e 0blero, does it mean that the acceleration is zero? vekjd v6rjl7p vne7s,lb 02e.5siz6z 00i+po Support your answer with an example.

  Can an object's velocity changejf. k 2*4bhzbj direction when its acceleration is constant? Support your answzbb2*j h.f4 jker with an example.

  Suppose that an object is moving with constant acceleration.1jpqb np6 q-zl4v/e1o Make a statement concerning its motion wbp 16n zeq1/ol jv-pq4ith respect to time.

  Can an object have increasing speed while itf3r tk6bju* j yo8se9)s acceleration is decreasing? Support your answer with an exsotf*ry e) j9kbj638 uample.

  Suppose a can, after an initial kick, moves up along a smooth hixx: sw -m4sgw3c*+3 hbhwwk 8yll of ice. Make a statemen8:yxgw-h wkww4h+*3smx3c s bt concerning its acceleration.

  Under what condition is avn s;uj-whr(yl c,ju+ +erage velocity equal to the average of the object's initial and final velocit cjuhw-+ly+ ;jrs(, uny?

  Objects A and B both start at rest. Tmo1 jrvzezj8l l5n*x(xzuk 5fw582(l hey both accelerate at the same rate. However, object A accelerates for twice the u knl( l jze5l5r8mxo1jz5z*xw 28fv (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 / x0m8r 95limtwy te.jrest. They both accelerate at the same rate. However, object A accelerates for twice x my/tir9w0m.e8 ljt5the 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 friction, whibm;e6,;yg / r ndc3r msvb,1bwch of the following is true concn rews y;c 3 ;bb/v,g,1rb6mmderning its motion?

  When an object is released from rest and falls in the absence om6w rxsc)4i4df friction, whichi6srd m)4cw4 x of the following is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the7ehf1 v -gzzz1x:lc;r velocity and the acceleration when the ball reaches the highest point.zx gr;h1c-zv lf17z:e

  Suppose a ball is thrown straight up. What is its acceleration just before i2 yj: lofzyogw:bz1j,19 f,hy-rb *ap t rz9:p,z *2:yfb1 1ljwog-jyr obfay, heaches its highest point?

  Suppose a ball is thrown straight up, reaches a maximum height, then falusgdwqr n-ne ap0y u.-d-oc4+(s 6zw zt-j,3g ls to its initial height. Make a st n o6sy-apr -tw+gde4uj,z ndz-0-sguq(. wc3atement 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 infh/dpfbk62r(( ihk j+zx 5l 2qitial height. Make a statement aboqzxh2+r 2 b6f d( (jkh/ipfk5lut the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downw-.lu;gx pyhm:.da7c s ard in the absence of air resistance. Make a statement concerning its accsxa..cm;-yhdp u g:l7 eleration.

  Suppose a skydiver jumps frav 4iv+;m5;,jf nifwx om a high-flying plane. What is her acceleration when sjw,vxa; inf5 4+ ;vfimhe she reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. Af rv *05xm+pyvn 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 firv05xm vy*p +frst 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 lazgc.n yv qdbwu+)vmd,c;3 ;4,elj1q kter, ball B is dropped from the ,qlk4g3. 1 uvy;,cjm+ qewdndvbc;z )same building. As time progresses, the distance between them

  Ball A is dropped from the top of a buil icdzj 5,z2+8hr js0cg5y 8tjnding. One second later, ball B is dropped from thj0srg,cn8 j chz5yizd+ 85j 2te same building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is thrown bp 5fo7+2uerg up, and the other is thrown down, both with the same initial speed. Whauf7 r+gb5pe2o t are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brfw f z,n2a(+fj nu22szick is thrown straight down from the same buildingn,w2z 2sn+fzu2fja f(. 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. 8vwqc:g2 qi9rThe positionc9iwq: 2vqg8r versus time graph of this object is

  An object is moving with constant non-zero acceleration in5 k:o .pwkzsmz+ z;ido q23y;y the +x axis. The position versus time s32zi. dyk;:5 qooyz+zpkmw ; graph of this object is

  An object is moving with constant non-zero veld4p1wrmxm kh j8by7: 6ocity in the +x axis. The velocity versus time grabjmkw:6h8m1yrp 4x7 dph of this object is

  An object is moving with constant non-zero acceleration in the +x axis. The*3j5 jb qb4pan)p/ tdw velocity versus time graph of this objec4jwq a b3/p d*pbjtn5)t is

  The slope of a position versus time graph giv2mlj ,i8;wyxrch - i1pes

  The slope of a velocity versus time graph w-)6fldabx/ 7oj7 uskbcv(p3 gives

  The area under a curve in fh km u8 xtkr::.2q(ckan acceleration versus time graph gives

  The area under a curve in a velocity versus time grahyh2 ngijdgon 2g;qvv 05(lr*64sx-, qvrv e5ph gives

  If the position versus time graph of an object 5 que , nvt:,xk e3fwxr6y.r:t5xcg e-is a horizontal line, the object isxyu :w.gr:q5vk, efe,-3r56tx ext nc

  If the position versus time graph of an object is a vertical line, the ob yicr0ey9 )iusa, 00vgject iseivys9au,c 00i r0yg)

  If the velocity versus time graph of an object is z :(t8f5 yx7baaf-lvpa horizontal line, the object isft-(af75l: a8x vzy bp

  If the velocity versus v4qk q5m:4 nwmtime graph of an object is a straight line making an angle of 30 degrees with the time axis, t:mqmkw q44n5vhe object is

  An object moves 15.0 m north and then 11.0 m south. Find both the di amd814d4y6mexja9 bmstance travbjdmm6ayea 48d 1 m4x9eled and the magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long wilni)xsz 88 tv;dl it take to move 12 km upstream in a river flow;sntx z8v i)8ding 6.0 km/h?

  55 mi/h is how many m/s? (1 mi =x 5dswlm;2*r3h q/uj u 1609 m)

  What must be your average speed in order toqaoe- ((w*yyvp e a3e3 travel 350 km in 5.15 h?

  A runner ran the marathon (op: ( nupt8cb1approximately 42.0 km) in 2 hours and 57 min. What is the average speed of the runner in nb:8( p1pto ucm/s?

  A car travels 90 km/h. How long does it tajr;r c4unsfvd24q3 g. ke for it to travel 400 km?

  A ly (light year) is the distance that light travels in2l rdf k,va47l one year. The speed of light isva,kl7d lf4r 2 $3.00 \times 10^8 \; m/s$. 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 lookrp n jzq:1qv9gj9 3h;e to the side for 4.0 s, how far do you travel during 1jq93:zn ;ph9jerqvg this inattentive period?

  If you run a complete)-0 / wex9dg2vbr dwq(66 -qpsw-jxrivunb)p loop around an outdoor track (400 m), in 100 s, your average vel)ww/pbn d-xb0p-wvqq)gers -rxi(962j6d vuocity is

  A polar bear starts at the North Pole. It travels 1.0 km south,sdf gc5(l*jv(hl 8us ;0p6owj then 1.0 km east, then 1.0 km north, the; fjuhwpl860d( j c(s*sogl5vn 1.0 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 Northcm t3s*.,l yek Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to rety3mt, lc.sk* eurn 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 op5(j1bgixwjj8.; nwmi/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 yoj5 .bjp8gw (;iwx1j nour hometown from school?

  A motorist travels 160 km at 80 km3y(g* b g,ti1 5up7vibdoud1 v/h and 160 km at 100 km/h. What is the averagp( ii5 ydtvuog7*,b11 gbvu3de speed of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h xmu6 :+3yprywat 100 km/h. What is her average speed f6+m: wurpx yy3or the trip?

  An airplane travels at 300 mi/h sok yl33p/+v eiquth for 2.00 h and then at 250 mi/h north for 750 miles. What is the average speed for the tril3pqe 3 +/kvyip?

  In a 400-m relay race the anchorman (the person wholr 7+ksg 4 15j/wyodsy 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 startsr 5y+j7y4gklw s/do1s 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 8 8e rtpv3 22 ez6vcy6nds. The car's average velocity during deceleration was 49 km/h. Wrpv2 vc z2y63dt8n ee6hat was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the average ratn b gp5rkmlt1g7e 0a. d6d-p-de of d tmp kglda .1r075edg6nbp--$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the ragz3p*q q91v kb/y//f +gsuoa9upe 5 .kuxijy:te 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 accelerate-muu xa6h41 dr5(k ejhs 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 withohay/u8 g /l9 fxnk9s* a constant acceleration ags/9yn h* 8/lfouk9x of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 3.4 m/s experiences a constant accelhlxl nm(ta+y5;3u( zv, )wq uleration ofah;uzvqm,)l 5 (ny(x+ ltw 3ul $2.5 \; m/s^2$. What is the cart's displacement during the first 7.3 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed ofb)0 rygz.h4g irt t70e 436 m/s strikes a sandbag and penetrates a distance of 37.67 cm. What bg)74tz tirr 0eg.hy0is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an apz 0oor uc575dircraft carrier. 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 catapultocz0pu75r o5d ?

  A car starting from rest moves with consd7ki(unj:8r q7(ecil rm u/:ltant 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 of1dc)b-u 4tgrn 200 m. What is its average acrgtn )1 d-b4ucceleration?

  An object starts from rest and undergoes un3o mtcv0nv:;hiform acceleration. During the first second it travels 8.8 m. How fnt0v: vom;hc3ar will it travel during the third second?

  An object is moving in a straight line with ck)atb fd1v(3 o3s pot0onstant acceleration. Initially it is traveling at 16 m/s. 3o t1)tdov 3sa(pb0fk Three seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates uniformlygyf0ft85- j-y9k5ri1oct rxl 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 dec,/xd1 +idnx,n w9-k fqwaca5 celerate 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 greenc.:zl 8 aegi(d, a car that has been waiting at the intersection starts ahead with a constant acceleratizdge8l ac.(: ion 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 speefg/zb my o-l.7p,ezg9d of 12 m/s on the surface of planet X where the accelerazz/ lfe. g7,9pm-g byotion due 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 surf st8inrtl6/dd( b1mq+uc2mgbv6 i: 1lace of planet X where the acceleration due tor:ct 1mq ig68usbd /ilndbv2tm6 1 (+l 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.ubncwn/y9wbwco :ckw 4 (, eb0ke5)b speed of 15 m/s on the surface of planet X where the acceleration knyee9cwb 0:w,5)ocwb4(cb. /wu b nkdue 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 s2wiu7d jiu8 :a speed of 14 m/s on the surface of planet X whe uiis:u87dj2 wre the acceleration 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 holds a r zx9)hja 5plr-uler between your fingerjz p-ha l9x5)rs 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 velocityd,9trtj2/y h, jwe 3ls after 3.00 s?dtl jjy9se3hr,t ,w2/

  A bullet shot straighasztc)zj - .uyy6*toekz/307tljeo 3t up returns to its starting point in 7 s. What is the initial speed of y-)7jzut30/*ea t o6et 3z.sczlk oyjthe bullet?

  A ball is thrown straight up with a speed of 36.0 m/ha8 mln 8b.kt:/ww ir d1r1o;os. How long does it take to return to its sn81waot rmd8k;o hwlb :./i1r tarting point?

  A ball is thrown downwarv3x rwt 8xy4z*:vzb-a74oi u hd from the top of a building with an initial speed of 11 mva x4u- :yz vz*ot4hr 8bi7xw3/s. It strikes the ground after 2.0 s. How high is the building?

  A ball is thrown straight u*d vm;7m-qmk hp with a speed of 30 m/s. (only fill in numerical value in the h m;-*mkvd mq7blanks)
(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;r8 kkio5 9gdn air with a speed of 32.9 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 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 tk.w xmoc45- j,q smtqd.wbw(24 d0agvelocity at t = 1.0 s?

  In Fig. below, what is the velocity at t =h+3po ar 7rqpi8plo,uipve9.*t . +u n 2.5 s?

  In Fig. below, what is the- vleo/p4wbqxg(c 9* i velocity at t = 4.0 s?

  In Fig. below, what i1qt fwm v/r .:nc8st8uzuo)qvh, ge7:s the velocity at t = 5.5 s?

  In Fig. below, what is the asa7 l(ut/mjll- w0r7xmag,m)c y(vj (vz9 +czverage velocity from 0 to 4.0 s?

  In Fig. below, what is the averagev(tuod) spdjx b (b )i;7 d9mdirl)8q6 velocity from 0 to 6.0 s?

  In Fig. below, what i v s 1nlvv9nz0hk*4cj(s the acceleration at 1.0 s?

  In Fig. below, what is the xx+bu ch*fhtu 44)g+og;tz i1acceleration at 3.0 s?

  In Fig. below, what is the q4zm/ x1jwtx:average acceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration ub0 l,-fykv9 jfrom 0 to 8.0 s?

  In Fig. below, what is the di;.)0(. f .spgeqoy rbf;ayztjsplacement from 0 to 8.0 s?

Does a car speedometer 7o1 0l : dxqndxiszp07measure speed, velocity? {speed|velocity}

  An object can have a varying speed if its velocity is constecc7r;5ed mp oz8q7908ea rfhant.

  The velocity of an object *p bu/ 5;2 pr()ptga0ahcodjecan be negative when its acceleration is positive.

  If one object has a grea rs)0 (0sg7o8lyprn6q 6 qasveter speed than a second object, the first must have a greater alyrg)s 0qpqn 68( aeor7s60v scceleration.

  Two cars emerge side by side from a tunnel. Car A icor/ncm h*tm) +qm-x f3 y;ic)s 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 inc.gj8 7e2t f/a58i0dh l oazkmlreasing in speed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It leaves thsto ,-m ae)2jbe bat with a s2-)ebt,m jo aspeed 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 ie r;ty+ aemu,w2b21ahappening to its acceleration, how doew ty r+;ee2abu 2,a1mis it change if air friction is ignored?

  As a freely falling object speeds up, w/t;fzt3o)tbbn j3skv q*r-.)tj8c gbhat is happening to its acceleration, how does iojt zqcrkb)v33g;*f8 -n/ts jt.b)btt change if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its origina q29 dp:d9fhmr;xag ye9pol58l position with the same speed as it had initially if air resi 9p;xa :qgm82r9 dydh5f el9opstance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration at the sax2z3*b ttm oiv+,bu-kme time.

  An object can have nonzero velocity and zero acceleration at the same time.yhogzr() 9v)n

  An elevator moving from thes dq(ahf ee/qv1s2 9s3 second floor to the fifth floor making no stops along the way has zero acceleration all the tesq(/fsh 2e1d 9vsqa3 ime.

  A rolling ball moves fnp)5j cn/4tqh vlm6o 8rom $x_1=1.8 \mathrm{~cm}$ to $x_2=-6.7 \mathrm{~cm}$ during the time from $t_1=2.6 \mathrm{~s}$ 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 $t_1=-3.9 \mathrm{~s}$ is at $x_1=2.0 \mathrm{~cm}$ and at $t_2=3.6 \mathrm{~s}$ is at $x_2=8.1 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight comp ike:mu53q8jn lete laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 11.3 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 88 m awaf iivq0fw g8(0y in 8.8 s. It then turns abruptly and gallops halfway back in 4.5 s. Calculate (a) its average speed8iq0 v0(gfwif  (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 fromal*z, u(xh(fh $12 \; m/s$ to $23 \; m/s$ in 6.0 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 frogk 0 uxcita hy40dx ewwv00)2*m $19 \; m/s$ to rest in a distance of 77 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a spezwt *wmqj 7yh/:tit 31ed of $31 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.9 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essential,ra-ll ;6 gq2dclyy3qly top speed about3lcy6,g-r;ald lq qy2 $10.6 \; m/s$ 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 s ;+ ka-:ddzzzk*jxi9q 8d5wfzpeed of $18 \; m/s$ 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 high .dw)sigtz -vr 3 x9*j+.kvqueway. Assuming a decelera.zsdv+v* xtw3 g)ej9.kq-urition of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truc18z 5yj ;f7dvkpa8 o,o2nd uodk 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).    $m$