Suppose that an object travels from one p2ks 7vwc*cdqh7bf / .xoint in space to another. Make a comparison bhk7qcc fsd7.wxv* 2/between the displacement and the distance traveled.

  When is the average velocity of an object equal to the instantaneous ve0y 8hp 5sw:ornlocity?

  A new car manufacturer advertises that their car can go "n/ bx0zx5ws:62 jnbj gfrom zero to sixty in 8 s". This is a description of xng w 0sb56j2:xzb/jn

  An object moving in the +x axis 7ti 3wg6*y/dj u;q bcedqk i3)experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to slow doxrw*ue);; ,xi s1ba sxh9zuu:wn as it approaches a traffic light. Make a statemen *)9huaxxx i1,; :swzesub;rut concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slow dow;-hrrvxnqv g*yo **mzz/q)4in as i vq* -;i4xq / zrgh)*mrvnz*oyt approaches a traffic light. Make a statement concerning its acceleration.

  Suppose that an object rj66)euih3sy qf7ly.is moving with a constant velocity. Make a statement concelhjeyr7i. sfy)q 6 36urning its acceleration.

  If the velocity of an p,zeqgn1 2ee: c*dfjo6b k0 a;object is zero, does it mean that the acceleration is zero? Support your answer wi ge, *o0 f21e;ezqdk:jpcnab 6th an example.

  Can an object's velocity change direction when its h83z8wl2nyycft 1cs :jek h0* acceleration is constant? Sul8h tsyw c8kcy :hf*1e320njzpport your answer with an example.

  Suppose that an object is moving with constant acceleration. qclvo m6 e uk2.4m7)h(d9drep Make a statement concerning its motion with redpquor )m 4mvkedc el96(7.2hspect to time.

  Can an object have increasing speed while its acceleration is decreasing? im xj-0)uk t/k Support your ansuktk/-0m) xjiwer with an example.

  Suppose a can, after an initial kick, moves up along a sma n*4gcgpr l1nip*ovpeg w +fa+/.92aooth hill of ice. Make a statement concerning its accele1a9*g+ f gepn4ivpg r2wnac*pa.+lo / ration.

  Under what condition isfmo4-.zt; c bn/m(anb average velocity equal to the average of the object's inb(mfoa/nn ;c4 m -.zbtitial and final velocity?

  Objects A and B both st-jts0apl+ f/ j5glvo 3art at rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B.gjj fa-vtl0p+/s 3l5o What is the final speed of object A compared to that of object B?

  Objects A and B both stab*k sph3 kc(k4ielc.4 rt from rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. c 44klc pi *shkkeb3.( What is the distance traveled by object A compared to that of object B?

  When an object is released from rest and fakpgfew-5 +k6m)c* plb lls in the absence of friction, which of the following is bk 6w e)kfpm-g *c5p+ltrue concerning its motion?

  When an object is re nv/0* c1ch.w cbqm.jaleased from rest and falls in the absence of friction, which of the fomq. h/nj.vccc0b a w1*llowing is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the2vcnapbj72 ;m o: bf;v velocity and the acceleration whem;2o2ab : p7vfbjv ;ncn the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is+ hv ish/msk5, its acceleration just before it reachhk/vsms+ 5 ih,es its highest point?

  Suppose a ball is thrown straight up, reaches a maximum height, then faleze ph5/ (,st ;a,gt2as:th evls to its initial height. Make a statement about the direction of the velocity and acceleration as t hts2 za;he5/a(:tst ,gpee,vhe ball is going up.

  A ball is thrown straight uiz::e,kh qse :p, reaches a maximum height, then falls to its initial height. Make a statement about the direction ,eez:::k s hqiof the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown ;l 0f-p1b ogvwdownward in the absence of air resistance. Make a statement concerning its acceleratigowv-l pf0 b;1on.

  Suppose a skydiver jumps from a high-flying plane.sc,+.g qsljb. What is her acceleration when shelsq+.c jgbs ,. she reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An ocv50f,*rk lfk(hyy 3 identical second ball is thrown upward with a speed 2v (twice as fast). ,hr( yyo 5c l*30kvfkfWhat is the ratio of the maximum height of the second ball to that of the first ball? (How many times higher does the second ball go than the first ball?)

  Ball A is dropped from the top of a buvod221bk6 uu+6g7y3u8ykc 2nn hcxr q ilding. One second later, ball B is dropped from the same building. As time progresses, the distance between thh861kc27o3 6ydc qngku 2yu+xv2ub r nem

  Ball A is dropped from the top of a building.l g -dakhk8 3ic.rxq83 One second later, ball B is dropped from the same building. As time progresses, the difference in their speedshdgq cklxr8.8k i3a3-

  Two objects are thrown from the top of a tals5kutut)ogx + s t4/qj*),kbt l building. One is thrown up, and the other is thrown down, bot o j sgtxsqt*t/b,)k4) k5+uuth with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a busf tjd z9tj6ho:22oklw: 4h )kilding. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compa 2zjs9hj:d lko wt f2k6)o:h4tre the accelerations of the two bricks.

  An object is moving with consttx 1j44(fkvqgant non-zero velocity in the +x axis. The position vev4xjt1f (4 qkgrsus time graph of this object is

  An object is moving with constant non-zero acceleration in the +x axis b +( /2-yaty69,bxalkcfbp wa. The position versus time grabapcy abk2-6tx9+wla, (b/yf ph of this object is

  An object is moving with constant non-zero velocity in the +x axis.h q.kzxae j(spa2w:(qvaow9 v g) +89w The velocity versus time graph of this objqa9 8wv( ezo(hxw9q gvp:)2a.sa w +jkect is

  An object is moving with constant non-zertdkl f 14a(l.lo acceleration in the +x axis. The velocity versus time graph of this objectl4kdal( tfl.1 is

  The slope of a position versus time - t8vc;fz to;pgraph gives

  The slope of a velocity versus time graph0h jy8vuans;.vjxb5 *7r2 eo s gives

  The area under a curve roj sqo;:*r) pin an acceleration versus time graph gives

  The area under a curve in a vet:) nvm:+m4yryl i3 ullocity versus time graph gives

  If the position versus time graph of an object is a horizontal1tvo0ty is 2x) line, the object ist1s0) t yio2vx

  If the position versus time graph of ant- )d,eguxqs) object is a vertical line, the object ist, es) xugd-q)

  If the velocity versus time graph of an object is a horizontal linet9/s zohl.oyc x*,7 vlnkfu ufw 2*i6,, the object isvk/6,ul2 s hl**u,tzf wnoof9ciy x.7

  If the velocity versus time gvm 4istos v4ix*r0 z65raph of an object is a straight line making an angle of 30 064o m *s vxiitsv5zr4degrees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both t086h)cg rdcj ahe distance traveled and the magnithgcc6 )j 8a0drude of the displacement vector.

  A boat can move at 30 km/h in still water. How long will ;x;b3ryl ge1d it take to move 12 km upstream in a river xy1rbdg;e;l3 flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609 3-8*e5wcj xb4un irv+rubht*) +oggvm)

  What must be your average speed in orde k2brjq9gp5 eqf 1.e/c;8cnmpr to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min. W24hdku27h fl khat is the average speed of the ru4f 7hkdluh k22nner in m/s?

  A car travels 90 km/h. How long does it take f y3*romj52fuv za2c+h or it to travel 400 km?

  A ly (light year) is the distance that light travels in one edy0vmwl:0l:year. The speed of lil0:emw :lv0y dght 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 aonh1 jnn9- (mm7 pr6f1ts3mp jfn)ws3 straight road and you look to the side for 4.0 s,jp7 9on1pr)mnsmnwfs(1h3 mt6-nfj 3 how far do you travel during this inattentive period?

  If you run a complete loop arounjc0737- iclr8b z26cbiluub vd an outdoor track (400 m), in 100 s, your avera6783ilu clbibzrbu2c7v c -0jge velocity is

  A polar bear starts at the North Pole. It trav2/m 83dt(:r hka5akx-t t vl81qgok ncib) sj,els 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 wr 8j :txk-hbqkg,3/2s k tmcvn)ilo(1a8 tda5as the bear's average speed?

  A polar bear starts at the North Pole. It travels 1.0 kqhel:ge7: +j qkhb2m;m south, then 1.0 km east,hqg jqh::b;k2 e+e7l m 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 velocity?

  You are driving home on a weekend from j;p. a0r-cs/f lraja3p l8el-eqr 1k;school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive hr-aecqsj018la e-a3f pr/; rljpkl .;ome 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 .q*j3pjpxcz /n .u; aw100 km/h. What is the average speed of the motorist for*qa. ;j/uxpj c.p wnz3 this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is hei qfv,wmgu- ),yjr57kr average speed for the r5-,vgm, fq7y jwui)ktrip?

  An airplane travels at 30nc*++w4nv 7i cz z0)g z;vv(,fuqeazj0 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles.)(q n4v+zeuvgw,nfc a+ 0;jz7zzc*vi What is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 10:pv9 ,vw;o)bdyz i t8x0 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 leg9ptb oi) 8vz,;:yvwdx 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 s. 7m93v vh8pc d13v qclqfm2dw5 The car's average velvcdqmc8pv 3l2vdw95 1m3 h7 qfocity during deceleration was 57 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the averagx/2jxq+8ff)pg l2tu2. c anz(riwc6 pe rate of zjflr22)pn.ap c+xc(u68/f gxt2qw i$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/*i jvgr 61xzx)h 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 and acc;vqh4eu g, hol7w2 cx)elerates 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 /r 9dd-c 6uscbop 8pe5speeds up with a constant acceleration ofe8d9c o6cbs/pdur 5p - $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 5.9p/g 0 8etrr,jnlu5r 3j m/s experiences a constant acceleration o,0t /3le pr5 grr8unjjf $2.2 \; m/s^2$. What is the cart's displacement during the first 4.0 s of its motion?

  A bullet moving horizontally to the right (+x directiof(q7egby: 30si8d eyi n) with a speed of 341 m/s strikes a sandbag and penetrates a distance of 87.25 cm. What is sydq b:(7if8i3egy0e the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrier. It r+8j pifl5dc6bm k0 c6neaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the accelerationpdc6 bcm6j+0nif k85 l is constant, what is the length of the catapult?

  A car starting from rest moves withhw,el (aqg4 p,) ztyt y4e,y.o 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 gjgt a-cjo2j b,4()yd2 d c.cva distance of 200 m. What is its average accelerationyao4g 2 d(-vcjj)2t .c,cgjdb ?

  An object starts from rest and undergoes uniform acceleration. t y6*e 7(mnou1upt5spDuring the first second it travels 1.3 m. How far will it traveou p 6u51typ(e*mstn7l during the third second?

  An object is moving in a straight line with constant acceleration. s0sz+6 ayg6xk)af n0xayql(;Initially it is traveling at 16 m/s. Three seconds laty xsza 6 as;l)q00f+ak6yxg(ner it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and sesy 7m je-+fclwqu, -n/r26faccelerates 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 deceletyo7p evik 9j:l6k2c+ rate 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 turnst2rpc( /z:z;(9 tky .-vviixdh9j fxt green, a car that has been waiting at the intersection starts ahea2t( zt.f;p/9-ky r hixc i9d(: zvjxtvd 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 ,;m mz ;,7k*thlfs2 gia7 qebqon the surface of planet X where thl k7a;g,b*siqtfz 7 mmq2;h,e e acceleration 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 th8j7v ;hlxxinkev.o.3 e surface of planet X where the v.h.evj3;n8i 7xok lxacceleration 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 upughx 59omn zm 8,4q)xzward with a speed of 15 m/s on the surface of planet X where the acceleratmxg, nu mz)xh5q9z 84oion 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 u1 d733 p swjxssrircfdoa+6)ld:uw 0-pward with a speed of 14 m/s on the surface of planet X where the acwddw:)6j7 1fd+rp0xasiu sor - 3 ls3cceleration due to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usup nk nuuq-r7rt );40zmally greater than 0.10 s. If your friend holds a ruler pk ;nznm tu7r4r0)uq -between 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 191pf .8pre,g:3 pvk,/1 g fxkn rdqq1nj.6 m/s. What is its velocity after 3kvd1 k/f,qr13e1 qg . jfpx:, n8rnppg.00 s?

  A bullet shot straight up returns to its stn +6j,-gligy narting point in 18 s. What is the init+- ingj ngy,l6ial speed of the bullet?

  A ball is thrown straj25xweds+zfn-k dx )2ksr1h 6ight up with a speed of 36.0 m/s. How long does it take to return to its starting poin12k+ -es2)dxjkr w6nfd5xshz t?

  A ball is thrown downward from the top of a building wipu) bamlw 41i-th an initial speed of 17 m/s. It strikes the gro)wau- mpb1i4lund after 4.0 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fio .euw3(r,mq ull in numerical value io ue.m3(r,qw un the 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 into the air with a speed of 41.7 m/s.ug 396pq m evtzee3h. me--y1u (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 1 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 hp1 (5au rdm:uthe velocity at t = 1.0 s?

  In Fig. below, what is the velocity at t =wo oas9wa z: *a eule5(0niiu0h lr269 2.5 s?

  In Fig. below, what iaq)qysc (p8p 2s the velocity at t = 4.0 s?

  In Fig. below, what is the velocity at t = 5.5 pl5bn 3f4yh cfl;gjpp 4 l0w1n1f-u/gs?

  In Fig. below, what is the average velocity frxx .m6wwcg*,4pkz 1n com 0 to 4.0 s?

  In Fig. below, what iy wsc)-*g oz.x5 us2dfs the average velocity from 0 to 6.0 s?

  In Fig. below, what is the accel9e ogp 2)uhkpkv )i 019 4tjrtbx+eid3eration at 1.0 s?

  In Fig. below, what is the accexwzry1;ha4mgw583hv2r ly5 rleration at 3.0 s?

  In Fig. below, what is the average accel3 flgqw z4xk:htpejj ob8 m(ab2+26n1eration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 t: yezwky(6f z(mi4gvyk248 sgo 8.0 s?

  In Fig. below, what is the d.mf5yri69 (.p cou ,rvvxao j-isplacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? v bjao: xj7.kha)0 l/t(/ auab{speed|velocity}

  An object can have a varying speed if its vt( /c)il 9igmhq,+vzl4ujm1welocity is constant.

  The velocity of an object can be negative when its acceleration is poo5, f agqzqwvl:ou+*/qx)e akvvj3/9 sitive.

  If one object has a greateqwfvt n,)/t2p usqp/z 1p)us.r speed than a second object, the first must have a greater acceler1qp sq./ps zftptn/u2uv ,))wation.

  Two cars emerge side by side from a t 1x lwf9b.lrl*unnel. 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 accelenyha1hity i:hms 9,;j*8mqknj8 9wx 8ration decreases.

  A baseball player hits a foul ball straight up into the air. It leyy nn wd-0do11aves the bat with a speed nnd1- 0ydw o1yof $120 \; km/h$. 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 n +s* n3uubauhp az8n17 2o(weacceleration, how does it change if air friction wn( ohu *+n2 s7a ub3ze1pn8auis ignored?

  As a freely falling object speeds up, .6 k0/e fnzip t(9qoswwhat is happening to its acceleration, how does it change if air friction CAN NOT be ignored qpse9o 6 f/w0nz.(tik?

  An object that is thrown vertically upward will return to it1uv,vw/uo3vt s original position with the same speed as it had initially if air resistance is negligible. vuvtu3 ,o 1/wvIf air resistance is appreciable, how will this result be altered?

  An object can have zero velociuuc9t 2,oy -e-b ueuu3ty and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acceler(;2 k/lnkcieg-wz:xalsy++b ation at the same time.

  An elevator moving from the second floor to the fifth,tp9 6y;yg-m82s uv qzmx)w cw floor making no stops along the way has zero acceleration all the wywg,6s 2 mm)uyzq -8cxtp9v;time.

  A rolling ball moves f6w9b-.ijmbv+m a vl +irom $x_1=1.7 \mathrm{~cm}$ to $x_2=-5.5 \mathrm{~cm}$ during the time from $t_1=1.4 \mathrm{~s}$ 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 $t_1=-2.2 \mathrm{~s}$ is at $x_1=2.1 \mathrm{~cm}$ and at $t_2=3.4 \mathrm{~s}$ is at $x_2=7.4 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps aro -abff14ptbfo13 fi2iund a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 7.1 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,42vnydw+ mp(ecwc32n *fc5l t moving 105 m away in 8.3 s. It then turns abruptly and gallops halfway ba+lwvn*22cfwy d4m5cep n3 (tcck in 4.7 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 fr2qskb 8o q0a:pldv 4:som $13 \; m/s$ to $23 \; m/s$ in 4.9 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 fromts( j2*uif oe9eku8,r $19 \; m/s$ to rest in a distance of 80 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a spegiq7guqy+ 82v+klhr 4eyf 4t*ed of $26 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.6 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the at:; lvfyrtts*fx: 1jb h5*1c blocks to essentially top speed abou tfsctvx*:y*5albt1;h1rj f: t $10.7 \; m/s$ in the first 12.4 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 sp sc yw3,cr-dtr m2a,-aeed of $20 \; m/s$ to rest in 5.29 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 bg vu6/b8d+lxh0)k+lep(l e u6znmz5 the highway. Assuming e)h /ubu6k8z+mnzpe+v bx6dl5 g0l( la deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goye 7 z/jv8a8l ;xog;mping $25 \; m/s$ 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).    $m$