Suppose that an object travels from one point in spvqm0/ p2ruc0a ,ty.*hkz ay6i0wv8 abace to another. Make a comparison between the displacement and the distance tvbk0.tv y* 0a/ay ,qu6z2pcram 0hw8iraveled.

  When is the average velouzx0pwg,8pnkknw/n -l )+ : excity of an object equal to the instantaneous velocity?

  A new car manufacturer advertises tt.l9x sm6 94*vy o/iptk-ghu hhat their car can go "from zero to sixty in 8 s". This is a dulh9 gt9 mt /4yo*xkv.- 6hsipescription of

  An object moving in the +x axis dsiqaupf +t-a6r 409dexperiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (jzrpm6o3:j h 4+x direction) begins to slow down as it approaches a traffic light. Make a stat:jmp3z4oj r h6ement concerning its acceleration.

  Suppose that a car traveling to the West (-x d)kywz kdwp rj,-;+7tx irection) begins to slow down as it approaches a traffic light. Make a statemek7zpyr )t wxkj+ ;dw,-nt concerning its acceleration.

  Suppose that an object is moving with a constant velol0qfhl.6vz9wjexpq 5y 4pbi mvukl(- i ,9/ w7city. Make a statement concerning itslw .mpk ljy,0iwueh6v7q xvfp95 z /- q(i94lb acceleration.

  If the velocity of an object is zero, does it mean that the acds hw p7(jsug c,;;ods/. hrk0celeration is zero? Support your answer d(c;hus0 h,.kjsrp/od ;s g7w with an example.

  Can an object's velocity change direction when its acceleration is anv3:px5c9 l(keup, h;jj:d oconstant? Support your answer with an eo; 5cp3p,lkd:uhxv e anj: 9j(xample.

  Suppose that an object is moving with constant acceleration. Make a statemen3dcbk2o 3 z,guw 24ul 2oss+hgt concerning its motion with respect to tis,c 3 o22+bdolwgg43 us2 zkuhme.

  Can an object have increasing speed j x 3z/1um-tsx2y p1ttwhile its acceleration is decreasing? Support your answer with2-t1x3puxjmzy1s/t t an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ic 7i-+ yhosv-mze. Make a s7--hv moyzi+ statement concerning its acceleration.

  Under what condition is average velocity equal to the av )5z mn8/16lllgl d(pjxpw 3rperage of the object's initial and final ve/p j()1g5llplmwz6 prn 83xd llocity?

  Objects A and B both start at rest. They both accelerate at the same n9d7 npgm(y hht9slsjpi, 0 /3vs4 u+trate. However, object A accelerates for twi4nhvt hps7 s9g j/ y0,d(p +litsm93nuce 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 the 9fu5c g0g9wlu same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A compared to cwfu90ulg g95that of object B?

  When an object is released from rest and falls in the absence of ghicql yk,t2(ttt6: 5gc . rv2friction, which of the follow:.,vtgi5 y r 6tgtl2c2kq hc(ting is true concerning its motion?

  When an object is released from rest and falls in the absence of friction, lu(arx7a; xx g 1hm+8bwhich of the folb x1gh xm+ula7;x (8ralowing is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the ry;99nvasw/fc 3c4f. yd;qsd velocity and the acceleration when the ball r;nc9d sc.ysar43 /yd v f;fqw9eaches the highest point.

  Suppose a ball is thrown straight up. What is its acceyb )pg6c -ca41s.cstgleration just before it reaches c s6py s .-4)catgcbg1its highest point?

  Suppose a ball is thrown straight up, reaches syg* rwo.y h01a maximum height, then falls to its initial height. Make a statement abo1y ow.y gh*s0rut the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then fallsqs*bwomxr5 24 .sdgskc9l4x, to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is coming dow*. go c5 s4br4 wkdqxm,9ls2xsn.

  Suppose a ball is thrown downward in the absence of air resi 2vd2z6fmut9estance. Make a statement concerni 2f m6ue9dtzv2ng its acceleration.

  Suppose a skydiver jumps from a high-flying pla4wjn cv7d bm(v.go0q ia q2z08ne. What is her acceleration whenv7i8qajz 4wn. c0 g0 ov2b(dmq she she reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An id7a rqx :i* c*7l8 9qiwxy chlu;ao*:dventical second ball is thrown upward with a spee *yi: xx **qv8:ao9lwqr;had ucil77cd 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 ball go than the first ball?)

  Ball A is dropped from the top of m n2c taps*al6r jm6g( 91ph3 qyl: -ydri48lka building. One second later, ball B is droppedmt* lq jh6 py2 ry 39:ai6(lk4sgr dpla8m1c-n from the same building. As time progresses, the distance between them

  Ball A is dropped from the top of a buildinu2z8d cc2)p dybi8; big. One second later, ball B is dropped from the same building. As time progresses, the diffep2 8d ydb8i;z)ui2bcc rence in their speeds

  Two objects are thrown from the top of a tall building. One is throw xf 1kxg,1qyr,n up, and the other is thrown d,1ykxx 1,qgf rown, both with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building.wisgok80d3 n+ A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations o0gs8+kiw on3df the two bricks.

  An object is moving with constant non-zjdi9w r)u dz +e8wbp,x9hj+p-ero velocity in the +x axis. The position versus tidzb ,w-jx u +r9+p ejp)8h9iwdme graph of this object is

  An object is moving w l 6ziwxkr8 +(ch/oe(rith constant non-zero acceleration in the +x axis. The position versus time graph of this objeci hk(oxze+cl (8r /rw6t is

  An object is moving with constant non-zerwtge+d3oymu501h lt5 o velocity in the +x axis. The velocity versus time graph o +03 t1oulhywtdg m5e5f this object is

  An object is moving with constant non d3wh5y+b1fo u-zero acceleration in the +x axis. The velocity versus time graph of this obj of b1hywdu35+ect is

  The slope of a position v v44v) uc.wkhy1ii 1hha jgl(.i59qjyersus time graph gives

  The slope of a velocity versus time graph givew6z ym9kiht- .q)x k6os

  The area under a curve in an acceleration / e8cgo;9r1 ;bkbw10 x)hrkgs,c uny uversus time graph gives

  The area under a curve in a velocity versus time graph 5sxwal-,fxz(th j :*k gives

  If the position versus time graph of an object is a horjko3paxb*r3 -izontal line, the object jxr*pa33b -ko is

  If the position versus time graph of an object is a rdun)nz6 pr ,:(ps, cdvertical line, the object iscdnd6zr p n:rsu ,)(p,

  If the velocity versus time graph of an ov5ss9hj vln:7 bject is a horizontal line, the object jv:5ns7 hlsv 9is

  If the velocity versus time graph of an object is a straight line making an a: lo2 7k)vf3cxhyu,psngle okxv)l y pfs oc7u:h2,3f 30 degrees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the distance trav(0wl-io z p q684+kjl lvv c15dznbij-elblv5j zl( -pqj8ow14dlzi -n 60k ivc+ed and the magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. Hoeb6.:coze.,0 iihr/oxm vq6 bw long will it take to move 12 km upstream in a r . 6ivz6x b0.oeoricqeh,m/:biver flowing 6.0 km/h?

  55 mi/h is how many m/s?*d ud pfm/ql *;(1tnwi (1 mi = 1609 m)

  What must be your averapb1owzj .c2y+ao)fe - 0rr- hrge speed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 minsniw74w 0 5d) hqta-*gcsj1 qc. What is the av ag)qwi1 n5wd -qs 704hstcc*jerage speed of the runner in m/s?

  A car travels 90 km/h. z xzmzbo/(:f pan3e8 yih123e How long does it take for it to travel 400 km?

  A ly (light year) is the dij: a -l;t 3-ji0ff )+kokxexslsv -m-dstance that light travels in one year. The speed of light im :--fxkod- kijj+es la;vf30s -)l xts $3.00 \times 10^8 \; m/s$. 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 ao s(8yefg,kq5 straight road and you look to the side for 4.0 s, how far do you eg8yq(,5fo s ktravel during this inattentive period?

  If you run a complete lot -z v9zpn0su)op around an outdoor track (400 m), in 100 s, your average velocity 0pzusz vn-)t9is

  A polar bear starts at the Nor vfdfj0c;1 jpq4 fnt:6.e /ddpth Pole. It travels 1.0 km south, then 1.0 km east, then 1.f0j;c4pdpd e.qd/ff t6n1 v: j0 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?

  A polar bear starts at the North Pole. It travels 1.w8)n;k b sn-daax- r0tykd* 6g0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west wknatg68 a y-sd)-dk;0xr*nb to return to its starting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home m;;ecav w)4y :; nr6suw xphv.on a weekend from 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 minutes. H6wm4vxswny c :;v;ra. eh)p;uow far is your hometown from school?

  A motorist travels 1607 pb fp-tfsc+;ju a t:u65z4yv km at 80 km/h and 160 km at 100 km/h. What is the average speed of theuyaf+st5z:c4f;7t pvbp j -u6 motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her aver lyw0,5-d6of4cu amw tage speed for the t-dwwlfuc,05o yt4 a6m rip?

  An airplane travels at 300 mdu4ly +7blbj)r zz12oi/h south for 2.00 h and then at 250 mi/h north for 750 m7)ylb zuold jb2+rz41iles. What is the average speed for the trip?

  In a 400-m relay race the anchor jav nw,mz/10gw2ax8 aman (the person who runs the last 100 m) for tea2 zm1nxwv0jaga8/aw, m 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 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 s. The car's avervz,tqw ;8*v/ / fvxy1w n)h)uicpbm)u age velocity during deceleration was 41 km/h. What was the car's decelw; 1vf )uuyw))vz8nqm,bi //cp xh* tveration while slowing down?

  An airplane increases i u/8b +mgc.6d nyld3lqdhm1 h9ik/uv5ts speed from 100 m/s to 160 m/s, at the average rate of m5+m qhd9i.3dbnu1uyld6l h/v k8/ gc$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h a+6 0jc ok8mbxz.iw2k 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 accelerae qn:ucspo65fxg7/u 2 tes 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 sp 5)aee)odsr awx4.4 cceeds up with a constant accelerationx)erc 4a. soe )5wcd4a of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity83we q 9aw;w4pfgnnxppo,9 7i of 1.9 m/s experiences a constant acceleration ofwnf 3nopwp9,e wqi7;894px ga $2.7 \; m/s^2$. 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 speed of 50d0c+ 21sllffps u1k2 l8 m/s strikes a sandbag and penetrates a distance of 23.44 cm. What is the average acceleration, iuf12+ls fls0cpd k1l2 n $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on a:: a7r 8/uh bhpp4ehhgn aircraft carrier. It reaches a speed of 47u hhp:e: hbhr8ag4/ p2 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 catapult?

  A car starting from rest moves with const0yw +k ub6q j)jt2d0tfant 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 qmctf9df:*y o* ,8gobdistance of 200 m. What is its average acceleratioc* * fmdqy,8g:boot 9fn?

  An object starts from rest and undergoes unifonfqh *4v 496v/.cpci:uhktpu rm acceleration. During the first second it travels 1.8 m. How far will icvnufp:q 4.*k/hh tp64u9cv it travel during the third second?

  An object is moving in a straight line with co0s,1-xr.l.j r amo l/ol/+mwt5 h xludnstant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10/x.5 1ml.srlxomrtj da,l l +wuo- /h0 m/s. How far does it move during this time?

  A car starts from rest and accelerates uniformly at7g8o: q:/qdo brbv;n u $3.0 \; m/s^2$. 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 decelerate at ab6b45v pouxkahjb+ot- o,k3 t4out $5.0 \; m/s^2$ 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 li+uyxv- 7 ecpa0abul2; ght turns green, a car that has been waiting at the intersection starts ahead with a constant ac7;-ycxvua b2a+ l epu0celeration 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/szlw; zy5) wu8khs 45asc t;7db on the surface of planet X where the acceleration due to gravity luat ;b) zs5w4;zsc7 dk8h5wyis $1.5 \; m/s^2$. 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 plan0msn n ixo:i8dp(d34zet X where the acceler:dpx38( i 0nnzsm4o idation 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 upward with a s a9*w :nf,p8opqhy3;kfknd 3tpeed of 15 m/s on the surface of planet X where the acceleration due to gravity83 kp3p,hoka:ftf 9y;*qndnw 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 pl+yl,0bbr p6ehu l;d .xanet X where the acceleration due to gravity lupry elb+d .6x h0,b;is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually + l ref zp0nc /naitwbem.:0o j524.ol-qvg:ugreater than 0.10 s. If your friend holds a ruler betw -n tcfmp0i: qao:+25b o e.enw4 jz.0/vluglreen your fingers and releases it without warning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upwardpj;+bn3ou d4r at a velocity of 19.6 m/s. What is its velocity after 3j3+opb r4du;n.00 s?

  A bullet shot straight up retux6 6r uk85mtuqrns to its starting point in 6 s. What is the initial speed of the bullet?kx56 8turm uq6

  A ball is thrown straight up wlt8gfg qgg( je/.9:qlith a speed of 36.0 m/s. How long does it take to return to its st:l(g.j t gqg/e9f g8qlarting point?

  A ball is thrown downw5qzthwr+k05q )hc w 8oard from the top of a building with an initial speed of 21 m/s. It strikes the groun hwocz5w qqkht5+r8)0d after 3.6 s. How high is the building?

  A ball is thrown straight c7-5njse 9wpcg1/5rt k(u4g3 dwutmv up with a speed of 30 m/s. (only fill in numerical value in th/c4swtuv3r7eg g9 jn t wc1(5m5pkd-ue 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 a-/ q9hswf3o iyir with a speed of 31.9 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 1 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 5 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 5.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the veloi7 h5bu n9.3ymhxzf * g89l6mylehqj2city at t = 1.0 s?

  In Fig. below, what is thwa;a/ keh (b6se velocity at t = 2.5 s?

  In Fig. below, what is the velocity at t = rd1 lj:vab m.64.0 s?

  In Fig. below, what is the qfg 7hv8:g 6h7x 0*lv:eflzkhvelocity at t = 5.5 s?

  In Fig. below, what is the r6:x(p o7i9v ry5yjqpaverage velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocizy6 j y3usqu-3ty from 0 to 6.0 s?

  In Fig. below, what is u;+xz x*ge5lethe acceleration at 1.0 s?

  In Fig. below, what is the acceleration atrn9no:djy: p )); vshtdn5q/b 3.0 s?

  In Fig. below, what p vxxrmu9,d/d6j:7 vcq*wns9is the average acceleration from 0 to 5.0 s?

  In Fig. below, what is the average accelgn 9ziw j26 b0eu yor;/pozd*.e:u5rberation from 0 to 8.0 s?

  In Fig. below, what is the displ:men/ q)ttfy )p x4fo.acement from 0 to 8.0 s?

Does a car speedometf3m78 qutx9 guer measure speed, velocity? {speed|velocity}

  An object can have a varying sxt6 5jz7mrj7vpeed if its velocity is constant.

  The velocity of an object can be negative when its acceler;zh.g h*fift que5m6f6+ut . qation is positive.

  If one object has a grlll1b:;y za4x (bsrz 9eater speed than a second object, the first must have a greater acceleration.ll1z;bz 4 9l:sby(rx a

  Two cars emerge side by side from a tunnel. C* x4zf6y,z u6bxsuoi75*be m sar 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 de684imx fp* vyccreases.

  A baseball player hits a foul ball straight (n un 11jv4eswlt3:sf up into the air. It leaves the bat with an nsus:jfwe 4vt1(31l 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(r ro6 x*zb+lh to its acceleration, how does it change if air friction is igx(b+6zolhr *r nored?

  As a freely falling object speedsao/utz (a. nl( up, what is happening to its acceleration, how donoz(u/lata.( es it change if air friction CAN NOT be ignored?

  An object that is thrown vertically el p5bi8mk9jo:j z3 -cvf-cgxr5u;n (upward will return to its original position with the same speed as it had initially if air resistance is negligible. If a8(fi lb:mx;-p ucjzj 9 n 5-5cgeo3vrkir resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration at o6(nm15 /+v/;lj +6kw o bzrfidmwgch the same time.

  An object can have nou,90 u (-midq5*v/melcenxgr8p ;oez nzero velocity and zero acceleration at the same time.

  An elevator moving from the second floeu6fks:u / dy6kar* 5wor to the fifth floor making no stops along the way has zero accelera*ad e:6ks6rfu wu5 /yktion all the time.

  A rolling ball moves from edrtbjo n:vn9 )+6 s;c$x_1=2.7 \mathrm{~cm}$ to $x_2=-6.9 \mathrm{~cm}$ during the time from $t_1=2.7 \mathrm{~s}$ to $t_2=5.4 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.0 \mathrm{~s}$ is at $x_1=3.3 \mathrm{~cm}$ and at $t_2=3.0 \mathrm{~s}$ is at $x_2=7.7 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter0q)6gv rpr0r+usw;:s t sj1 kv-mile ($1 \; mile = 1609 \; m$) track in a total time of 6.8 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its trainer 7ehnynaz *)xna fq:( -in a straight line, moving 100 m away in 13.9 sn)hn-: q z(eyxan*fa7 . It then turns abruptly 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 frj0l;lz3-sd d k bu:nr66-rnjr om $10 \; m/s$ to $23 \; m/s$ in 4.3 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 frox k, bm/-x5diqm $18 \; m/s$ 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 speed of g-rxh.v4c wy .oc(pmgu:0t/g $32 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.2 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially top speed abohuevyjp-0 03*zpv10gdbf t)q uty 0u0h -fev pdb3qz gp)j*1v0t $11.4 \; m/s$ in the first 12.2 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 fro6q5 ji+*+ju8;jzki7cdc iy ism a speed of $16 \; m/s$ to rest in 4.52 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 c k 2hjogkw6f(3+1zmlon the highway. Assuming a deceleratil kojkcg1hw2f36z+m (on of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck g6vtrdg7 y.ktua 9 l64rd/ia7f 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).    $m$