Suppose that an object travels from one point in jpm4e)+x06jox *hh87njq iytspace to another. Make a comparison between the displacement and the distance traveqh ijpt) 67hmn 8ye+o xj*xj40led.

  When is the average velocity of a yv:ql7)z z+lrn object equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zerwq-ah6( v1d+p8wu,: plbjxy jm)3zxq o to sixty in 8 s". Thisjbhajm u8px ,y dw)qvq6 w-1zxl:(3p+ is a description of

  An object moving in the7fl00;d vwi an +x axis 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 down +dtss(3 .f1q ywgopd,as it approaches a traffic lightps3f.d d ysqo+g (,1wt. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slow down a0;d) 1c,eslun46 imtz ;o k/epe mvb6hs it approaches a traffic light. Make az/ok m; 4ee 6pdlcu0eb),smt; vh16in statement concerning its acceleration.

  Suppose that an object is moving with a constant ve av:qlsizx eavw w -p )on9r.rq()(6)ulocity. Make a statement concerni).sw)uaqi)xr n9(velr6 voa -pw( :zqng its acceleration.

  If the velocity of an object is zero, does it mean that the acceleratiou-c 380ogozjo h kce82y+lp k2n is zero? Support your answer with an examplyzp8eo-+gk2lh38cc2oj uo0k e.

  Can an object's velocity change direction when its acceleration is coytnk u:err1 54nstant? Support your answer with an exampl e rynu1t5k4r:e.

  Suppose that an object is moving wiz9drt6e gamxma))fa p1 3; n8uth constant acceleration. Make a statement concerning its motion with nzm86mr1apd3g )f; t)au a xe9respect to time.

  Can an object have increasing speed while its acceleration is decreasing y :km znif5gs 1tk:wg.gp-/*i? Support your answer with an examp.sig1f:nkm:p t /g5wi*yz -kgle.

  Suppose a can, after an initial kick, moves up rwnj8 k/zsb/ ,along a smooth hill of ice. Make a statement concerning its acceleration/r / wjbnz,8ks.

  Under what condition is average velocity equal to the average obx5hfh nuu :6ia+n1 +wf the object's initial and final velw h+x:h6na ubn 1fi5+uocity?

  Objects A and B both start at rest. They both accelerate at the same5 io(m x3jh t1prip.2v rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to that of obje3 xt ivprmo (h15jpi.2ct B?

  Objects A and B both start from rest. They boyeg:x3xa mj0. th accelerate at the same rate. However, object A accelerates for twice the time as obej. mxa: x0yg3ject 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 absen-ez x) 1iwqry0ce of friction, which of the 1rzq)wi e-yx0following is true concerning its motion?

  When an object is released from rest and falls i rhae; 3h8;j )://xzwnf9x u4iw;lo nz7jntz en the absence of friction, which of the followinge/4:9x;3enh anl/ ;ziz)x;rwf tjz78jwu h on is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement abyb 1p y;qdo/) -ejcn9vout the velocity and the acceleratioy co dqj/e)1;y v-pnb9n when the ball reaches the highest point.

  Suppose a ball is thrown straight up. W 05v ,j +xzmnowy(-gjc.n9 /(jlnwhux hat is its acceleration just before it reaches its highest9ljg-n/zx,(o .n+ (x c0n5jmuw ywvhj point?

  Suppose a ball is thrown straight up, reaches a maximum height, tpk 86aa./q twuhen falls to its initial height. Make a statement about the direction of the velocity and acceleration as wk /u q6.8patathe ball is going up.

  A ball is thrown straight up, reaches a maximum height, theo-e c0x4w*:3zqwpk 6*x mnamjn falls to its initial height. Make a statement about the direction of the velocity and n c p46:x3e-waqm wxmo0*zkj*acceleration as the ball is coming down.

  Suppose a ball is thrown dy rp8bu zva7:imnreqfhn) e8.9 7e/9 vownward in the absence of air resistance. Make a statement con7n)z9mq: 9a hb ev8urpe/. eyi7fvr8 ncerning its acceleration.

  Suppose a skydiver jumps from a hc/k zq om)uzd9 (,2soj1xe ix2igh-flying plane. What is her acceleration whex 2jzoidc/2 (umx9 zs,q)o1e kn she she reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identicinxbi ,a,ni x0 ,u9,zsal second ball is inz i0xnau,i,bx ,s9,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 ball go than the first ball?)

  Ball A is dropped from the t n/ansi7k5sqv uw+l+9c(zs e ;op of a building. One second later, ball B is dropped from the same building. As time pqn;win9cv k+s5sslu+e/ ( az7 rogresses, the distance between them

  Ball A is dropped from the top of a building. One second later, ball::rh;shl+; o9keshs o+;uehp3jfe/ w B is dropped from the same building. As time progresses, the difference in the: hw ;o/hhpejs;sf:k 9 oes+u3rl+ h;eir speeds

  Two objects are thrown from the top of a tall build1y)v qpexra*h3wi,5ywj4m x+ing. One is thrown up, and the other is thrown down, both with the xy xravj w5ewimy1 ,qhp)34*+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 isev;p m2s 7xpu- thrown straight down from the s;psu xm 7p-ev2ame building. 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 my7- 75gi5 ow7. 7avhb.nff bkxafo-kthe +x axis. The position versus tim7. hvoa7fxi5yka--n .og mw7f f7b5 bke graph of this object is

  An object is moving with constant non-zero acceleration in the ahe1, jzxf7*,k7kdi9r 4 i)e ;csuxoj+x axis. The posir ;i*74sh 7k9dejucokiz)1, x ,ax ejftion versus time graph of this object is

  An object is moving with constant n*wrkg0 bvlvl39 j* z:don-zero velocity in the +x axis. The velocity versus 9jd 0rl:zv3b wvgkl**time graph of this object is

  An object is moving with constant non-zero acceleration in the +wr7y4 kdwmd*i v8cb a)wg*-(s x axis. The velocity versus time graph of this rv)m(cy7 wb8k-4ww ai g *d*dsobject is

  The slope of a position versus time graph giv)mupqxe 5wqta3 v/ .+ves

  The slope of a velociti/- yc*kwua4 ly versus time graph gives

  The area under a curv5u8( pmd1n 6 mbzp8yfve in an acceleration versus time graph gives

  The area under a curve in a velocity versus time graiv-ri01n 47( quwmrzcph gives

  If the position versus time g;gv5ifyz3 w).xz9va8tc h z9 kraph of an object is a horizontal line, the object isw yz9zzh;ix5 tvk8 cf9ag.)v3

  If the position versus time graph of an object is a vertical line, d8mb md53h62; yyw 8eonpve: rulke 7t4za95p the object isbrymw9h az6u8lemp5v;k5e3 t 4y27nod8d ep:

  If the velocity versus time graph of an object is a horizontal line, 08j.m(n qy.wal hoo) uthe object (j u.).ma0yw 8oqno hlis

  If the velocity versus time graph of an object gnd):va9 gr7f is a straight line making an angle of 30 degrees with the time axis)ngfa:r7 9 vdg, the object is

  An object moves 15.0 m zgea7 :h wpi)g;m74czszm17e north and then 11.0 m south. Find both the distance traveled and th z7h7m7 ws1)4zeigep:;mgac ze magnitude of the displacement vector.

  A boat can move at 30 km/h in still wate,rx 2.e agyt)mr. How long will it take to move 12 km upstream in a ri mry2a.xe)g, tver flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = iat3q5 8s * lmsmt8,yv1609 m)

  What must be your average speed in order to travel 350 km in g9i*h z c.y)pfi )y he) h2jr6ok+5f-q d:pkan5.15 h?

  A runner ran the marathon (approximatelyvm9 ypc+w+yc7 i44mts 42.0 km) in 2 hours and 57 min. What is the average speed of the runner in m/s?4cm s4+mv+c yy9wpti7

  A car travels 90 km/h. How long does it take for it to)m p-d t9: 5lqxn6mqcf travel 400 km?

  A ly (light year) is the z)k 77h/biuxbdistance that light travels in one year. The speed of li7 i)k/b7zubxhght 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 side for 4t2 b*uym, r s9i c+-zk;rfeg)ax0a7 rc.0 s, how far do you travabix9 y+cr* rcfuz0km7ar- e,g2;)s tel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, your ah ;-f+p5yjdn.c 7gnd;x2ai wxs42brjverage velocity ixpjnjb7 4 .h i w xdy-r;;dsf5+2cg2nas

  A polar bear starts at the North Pole. It dnvm9cj8 n50atravels 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 wa c05 jnd8mna9vs the bear's average speed?

  A polar bear starts at the North Pole. It traveol yinl.6j-s k9;a:vt ls 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 nl sv6 o. -tylk:ai9j;was the bear's average velocity?

  You are driving home on a w97pyywq hhuhtjf 069;joxp3 *eekend from school at 55 mi/h for 110 miles. It then sj 6p o9y;huwfh3* pxt 7hqyj09tarts to snow and you slow to 35 mi/h. You arrive home 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 100 km/h. What is the avofj r4.7-yh umerage speed of the motorist for tfy4u.7hmor j- his trip?

  A motorist travels for 3.0 h at 8p:v 7ajc/bl )j0 km/h and 2.0 h at 100 km/h. What is her average speed jca7vp /j):blfor the trip?

  An airplane travels at 300 mi/h south for 2.00 )epu,lnp* 6fw k (xsl-,befv:h and then at 250 mi/h north for 750 miles. ff,n6le,wsx ppbv lu -e:*)k(What is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the1di6e d+or2um 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 leg of the race, in order that the team A mdde rio+612urunner not lose the race?

  A car decelerates uniformly and comes to a stop after 12 s. Tyc. p)tvb:n1nhe car's average velocity during dec cp1tnv )b.y:neleration was 77 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 3*t, 8alskyeev r45,l j zeo*gm/s to 160 m/s, at the average rate of ye3l kg8,s zve oe5l4* j,a*rt$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rateix( lvr/i k3 ag6wd)(c 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 9tsw aci3y0,relerates 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 with a consta6g9+;5njgbfs l gitl .nt accelerationg;jngi+lb6 fl. gt95 s 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 2.4 m/s experiences a co +s7h eu92lbop*h wtc)nstant acceleration of) hh7 s9p leuwt+2cob* $1.3 \; m/s^2$. What is the cart's displacement during the first 6.2 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a5-q ypd7yf0ub ka2q;h speed of 509 m/s strikes a sandbag and penetrates a distanfb q52yh7yq0d-a upk ;ce of 91.19 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on )/b.ulf(h wqean aircraft 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 catapull)befw ./(uqh t?

  A car starting from rest move6z) u)bba;ejf s 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. lhs5jnb8+u : pWhat is its average accelejshb 8+n5u :plration?

  An object starts from rest and undergoes uniform acce7-kl,t:zi mgzleration. During the first second it travels 9.4 m. Ho lmk-z,zg:i7tw far will it travel during the third second?

  An object is moving in a straight line with 6w*l i)jsabn-. /ylzdp(a 9cgconstant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. Howga 69) dnj w(/zalsil-yb*cp. far does it move during this time?

  A car starts from rest and accelerat:i8l y.fgx5)w o wacn (bsy8;wes 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 decelerate at yc -z t-tee6;fabout $5.0 \; m/s^2$ 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,l39rro 6 e y-v*yilre6 a car that has been waiting at the intersection *e 3o r69y6-rllvreyistarts 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 e*gwuq jx+ 2r3on the surface of planet X where the acceleration duexr2 *qg+3uwje 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 surface of p)7-b .d- iu7uj0sb8bfqqv kdvlanet X where the a)-ud-k8db0 7uqbsb v.7vqfij cceleration 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 up7qgd3ti5d.gn1t 9 se qward with a speed of 15 m/s on the surface of planet X where the acceg dge51qts97 3qt.in dleration 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 upwarng0/8v l d0hrad with a speed of 14 m/s on the surface of planet X where the accelera8l/0dg0 vrhn ation 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 0.10y*rd,p (ncut( m s19bb s. If your friend holds a ruler pbtsnm9y( ,(dc *rb1 ubetween 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 velocif3 * cwro.b0nyty of 19.6 m/s. What is its velocity after 3.00 s?.3 noc0yrbf w*

  A bullet shot straight up returns to its starting point in 97)vsvsbu e: wfd7cz6- s. What is the initial speed of tcdfses:wv u z67v b-7)he bullet?

  A ball is thrown straight up with a speed6,d uj ;/rsfjnv*mb 9l4burg: gf7m)s of 36.0 m/s. How long does it take to return to its starting poiv jf mg s,urg674rs *b9):umd ;lbfj/nnt?

  A ball is thrown downward from the top of a building witwyqyk x8c-pwk 9 4rs7:h an initial speed of 9 m/s. It strikes the ground after 7.4 s. How high is the k8 q:wwysr49c-xk p7 ybuilding?

  A ball is thrown straight up with a speed of 30 akc:g*osji *6 pn:c 7; ei2.qkn7rag um/s. (only fill in numerical value i:aan7c .g:7i ;pg6cj*skk2 q orn*eiun 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 36.6 m/s. puti 1w3 5-vyp(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 12 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 12.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velociq-qo fe)bxuemix3xl1, x qy2r7j/4m(ty at t = 1.0 s?

  In Fig. below, what is the veloci+ * k fp5brh7j1retnb, 9 al4pxh5vm2yty at t = 2.5 s?

  In Fig. below, what is th(;f a+9pwx yohf;9.tx d*55 wlutskkue velocity at t = 4.0 s?

  In Fig. below, what is twp-4tkvwj )2b4lo;r z he velocity at t = 5.5 s?

  In Fig. below, what is th+.8zkr 8vj18wsmhsoc)0zt )4z zoomre average velocity from 0 to 4.0 s?

  In Fig. below, what is 9gza2 llvb2y4 the average velocity from 0 to 6.0 s?

  In Fig. below, what is the accelera cqdc o-r+,zi 3nk+v kaw;8e6ukw /lo,tion at 1.0 s?

  In Fig. below, what is the acceleration at 3v5sd /f ,yfyx uft(u1 4csce00.0 s?

  In Fig. below, what is the average acceleration from 0 zy:czw b 4b3w-w54x(.gebit. ,qbhbz to 5.0 s?

  In Fig. below, what is the average acceleration from 0 tx )a9s8ux o/a4,mf3in8 arhkho 8.0 s?

  In Fig. below, what is the displacement from 0 to 8.0 s?+ st*yxtb1a94 rzcxe 9

Does a car speedometer measure speed, velocity? {speed|veloc3e4s*z-,u rwpuv-h 6y- ooohqity}

  An object can have a varying speed;c/64 q xcjt e3tn3i pe0gc(:ulsyw w4 if its velocity is constant.

  The velocity of an object can b;/mbrs1p th(za-1qkf3d; bp t e negative when its acceleration is positive.

  If one object has a greater ss6c 81 asc rh3vb y1tg 47pyjv(fp+)zepeed than a second object, the first must have a greatezysc (rp7gh6sv te )ca +jyf8b4p3 v11r acceleration.

  Two cars emerge side by side (oe-hvrb 3w12sy6h7u hz ccw5 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 ozpd:kj)eo,h0q- -peas its acceleration decreases.

  A baseball player hits a foul ball straight up into the c( azibbioq 2)bqc4 0pt2 i(u7air. It leaves the bat with a speeia7 u(cpi (qo02biqbb tc4z2) d 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 hap sh2+3mdaki *gpening to its acceleration, how does it change if air fmsh2ig *dk+a 3riction is ignored?

  As a freely falling object speeds up, what is happening to its .h8u;vu4i jjg acceleration, how does it change if air friction CAN NOT be ignorehu; 48 v.jiujgd?

  An object that is thrown vertically upward will return to it2 vetfp9 -pj4hs original position with the same speed as it had initially f92tv -hjepp4if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonze2 ry, ms a*yvzsnh(nw+ a/4km0ro acceleration at the same time.

  An object can have nonzero velocity ay(msc9zkc c//iu:09rnr ka6ind zero acceleration at the same time.

  An elevator moving from thm9a0xqj x4 w,,m oc8wde second floor to the fifth floor making no stops along the way has zero a wo, cwj0x mdq8,a94xmcceleration all the time.

  A rolling ball moves from6xn ;eo6cfor9 $x_1=1.7 \mathrm{~cm}$ to $x_2=-7.5 \mathrm{~cm}$ during the time from $t_1=1.4 \mathrm{~s}$ 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 $t_1=-2.4 \mathrm{~s}$ is at $x_1=2.5 \mathrm{~cm}$ and at $t_2=4.4 \mathrm{~s}$ is at $x_2=7.2 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete -m0s 9edg cxwxg(e*k0((fze olaps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 7.2 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 straightmq 7rr-ju,(fb2*vk5wvjh p )k line, moving 89 m away in 11.1 s. It then turns abruptly and gallops halfway back in 4.8 s. Camjrhk-bjk)p*v fu 7w5v ,(2rqlculate (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 fromde8k nd,fag+ yd3:il6 $11 \; m/s$ to $24 \; m/s$ 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 frosde) of 3-g2n2i)nh zhsjc2 3nm $21 \; m/s$ to rest in a distance of 70 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reachy/l 8 ;oo2- hzove:mch a speed of $32 \; m/s$ 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 s rr;nrf c0m):of the blocks to essentially top speed about0:sfr)c mr nr; $10.7 \; m/s$ in the first 10.1 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)3dvzk;0pfmg 3g s r-ep+* cbu speed of $20 \; m/s$ to rest in 4.30 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid mar40-6iz xuf qy8huvt6g ks 92 m long on the highway. Assuming a d06yhiz8u6x4 tqfg -vu eceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a trupt 0+n.7cml4 z 4fh+bdcg1jbuck 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).    $m$