Suppose that an object 3 na, rrb2e gzh.fl6e-travels from one point in space to another. Make a comparison between the displacement and the drh3 bfgezan6.r ,-l2eistance traveled.

  When is the average velocity of an object equal1 kk 4 /qxg8/gc3ptrdt to the instantaneous velocity?

  A new car manufacturer arl r5k5 x13e elksuv7-dvertises that their car can go "from zero to sixty in 8 s". This is a dvr5 3l ulk1rk-7xee5sescription of

  An object moving in the +x axis experiences an7cj g l*q0x6uo:cktt* acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x directiehegx 0lhz(2k;z c,a5 on) begins to slow down as it approaches a traffic light. Make a statement concernxelghh k (z;5e02c,a zing its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slowkxfyy(zbn5.b z4 o9q/ down as it approaches q5byo9nyz(4xbfk z/. a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constauqse0; ;.yz9b8 0xm5s+bbsyiq* izm 0ib*fe p nt velocity. Make a statement concqs by+isibx9p00b *s qze 5em;iy *bmz08 ;fu.erning its acceleration.

  If the velocity of an object is zero, dpwcjec eq+4xil, g)jni ,ffi45tq :; 3oes it mean that the acceleration is zero? Support your answer with an exam fe+:q l4)j;ecnfxi i q,ct3jw4g,5piple.

  Can an object's velocity c 5o3s,iq ods,vhange direction when its acceleration is constant? Support youo5vs3qo,ds i ,r answer with an example.

  Suppose that an object is moving wi,wwtwp+ g,jl8/nx au:th constant acceleration. Make a statement concerning its moa/w lt:np w,x,ju 8w+gtion with respect to time.

  Can an object have increasing speed while its accelh0jfw met8j+l;10omk1x y.x 6fg vvo5eration is decreasing? Support your answer with an exayv5 me0t1 0 6xj joo;.kf xlfwv1g8mh+mple.

  Suppose a can, after an initial kick, moves up along a smooth hill of8 kx gfd .iphgc6xd6;. ice. Make a statement concerning its acceleration.fc. dkdx6x.g ip gh;68

  Under what condition is average v6xlobq h4.d0zelocity equal to the average of the object's initial and finhlo4 60dx. zqbal velocity?

  Objects A and B both start at rest. They bothtwnhy( /2b *+fp4ftjo accelerate at the same rate. However, object A accelerates fw*2 n/f y+ o(bhft4tjpor 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,yjuh7 m hr0ul(3 aeo4dd5au. start from rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A compared to that of object m ad 4r5j0u3ydoh(aul7e.u ,hB?

  When an object is released from rest and falls in the abs3iifw0 pj t.r*lk8--mgl +nruence of friction, which of the following is true concj fi-i.3nrgu klw0m8 lt-rp*+ erning its motion?

  When an object is released from rest and falls in the absen2.3a+ihs qf aice of friction, which of the following is true concerning its motion?a 3+2. hiqafis

  Suppose a ball is thrown straight up. Mak.*b-w uimqps 6m1r28o0izcgd e a statement about the velocity and the acceleration when u-z6. si i02orwmbpcm g8q1*dthe ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its :mnfe1x.w0y-ga sf) wfhb 11aacceleration just before it reaches its highest point?:sf.mn)ww0bhgye x1 1a- aff 1

  Suppose a ball is thrown / 6og szkn8wn5urr+4xstraight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the veln gu+w 4skxrozr 58n6/ocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height(y k,v( gxko vmod :f vt;7+eyn4i;b)e, then falls to its initial heigh4 e,(x kbvy 7oyd(nvo;+figt );k:emvt. Make a statement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistance. Make58:ucdb:u5 i i:lysc e a statement concerning its acceleratii:5 us ce8:cdylib: u5on.

  Suppose a skydiver jumps from a btc6thj*g+ k;plhg+4 high-flying plane. What is her acceleration when she she reaches termi*p j+;tlbggk4 h+ht6cnal velocity?

  A ball is thrown vertically upward with a speed v. f :go,cl gqdar/ 9aqam212b3 m An identical second ball is thrown upward with a speed 2v (twice as fast). Wh,/q3 o:gdab m ag1cq2lm2far9at 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 building. One second later, ball B is drofn *w bvo(g6c8pped fro 8*ngw(ovf b6cm the same building. As time progresses, the distance between them

  Ball A is dropped from the top vn v 8i4crhk91of a building. One second later, ball B is dropped from the same building. As time progresses, the difference in th8vhin v491k creir speeds

  Two objects are thrown from the top of a tall b6:mc+xj)8wutz k 3 6o9fxzbxruilding. One is thrown up, and the other is throw +r)6xxzk6u8: jtxbzo 93cfw mn down, 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. A second brick is tgc5x5ao(/me thrown straight down from the same building. They are released at the egmt5/xoac5( 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. swhdtvaa6f) sxu8fu+:j58 uzjy,: p ; The position versus time graph of this jx:au8w6+ s au8py d u5sf z):tvhf;j,object is

  An object is moving with cons 8phcll 0m *nv:cipyg20lorf( tf)s7.tant non-zero acceleration in the +x axis. The position versup2pisn0:v8f7m ct).0rll c*ofgy h(l s time graph of this object is

  An object is moving with constan)satt+ /plfq o(zvx /)t non-zero velocity in the +x axis. The velocity versus time graph of this objeca)ql(fsoxtv+ )/zp/ tt is

  An object is moving with constant non-zero acceleration in the +x axis.1r fxwa3e6) cm The velocity versus time gra)3mwf rxe6c1aph of this object is

  The slope of a position vebkd+03z 2: ehsi.vmgr/9 1 yewkc-oicrsus time graph gives

  The slope of a velocity vo9)f t)rbw x 07/hny ht3tcjm7ersus time graph gives

  The area under a curve in an acceleration tsy6 / nidg2c5versus time graph gives

  The area under a curve in a velocityz7 ujm5c,bmz8:gauwlq 0t-f 5 versus time graph gives

  If the position versus time graph of an object is a horizontal line, th oo v m*t le6q:x. 1ep7p0l2/iywt2apae object isp2qmplv ti*a: teyx 6wo7po .1ae 2l0/

  If the position versus time graph of an object is aaurjt0n:g5 s)r hd4 uy5a 9dk) vertical line, the object is59ru ) )5an0yh ku:d4rgastdj

  If the velocity versus time graph of an object is a horizontalglg3l(e- 57 .j/s6oazonw;bt yl. vfn line, the object 6o jfvt( ylel n3 w-.l5gon;/7.sag bzis

  If the velocity versus time graph of an object is a straight line making a st-ar;4cq d,g3noc9r n angle of 30 degrees with the time a3rag -,rsc4o ;d 9ctnqxis, the object is

  An object moves 15.0 m north and2r()4js5gxsb e/e4rip 3 phgj then 11.0 m south. Find both the distance traveled and th2j p/(3sp4e esj x5h4 br)igrge magnitude of the displacement vector.

  A boat can move at 30 km/h in still qf fx :.hfrabg/ 1o1j ea)lr/3water. How long will it take to move 12 km upstream in rag 1erofja/ 1lfx 3q/f.:)h ba river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi - 2dg q;asdol*= 1609 m)

  What must be your average speed in order to travel 350 km i6qwuil/b33 e;tn ix3wl;n5 ain 5.15 h?

  A runner ran the maratho w9ri eyz05so/5zz9 qe(ljri9n (approximately 42.0 km) in 2 hours and 57 min. What is the average sper5/5 zewiyz lrzi09 (qjs9eo 9ed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to traves2gd :*9kgxc cl 400 km?

  A ly (light year) is the distance that light travels in one noobhm:r9 b;ik1sj)y 2 w9jt4year. The speed of light on;41o: hmrj k9t sbw )ji2yb9is $3.00 \times 10^8 \; m/s$. 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 n,6(0rq pkwmp the side for 4.0 s, how far do you travel duringqpw mrpn0k( ,6 this inattentive period?

  If you run a complete loop around an outwkohm )4de4,ndoor track (400 m), in 100 s, your averag we, nhm44)kode velocity is

  A polar bear starts at the North Pole. It travels 1.0 km soj2t3 bl.ti-x hhc7 c *flh( :+imn1ofduth, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trhdol+cm. hxnt7cjf31 * bi2lhtfi -(:ip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It travfwa(1gd89qx6 jw )yjnels 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 velocinjj6(q8)wwf x1ya9d gty?

  You are driving home on a weekend from s+;vf6 rh5ui*z ts4 j*kn; dnikchool at 55 mi/h for 110 miles. It then starts to snow ant+ i;6 ;*s drzk4fiun v5jh*knd 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 t0zs wd /wwbz5:he average speed of the motorist for this trip?sw /5bz0wwdz:

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her aso ic6 v ++np81nt/ggvverage speed for the trip?6nov /+ ns+gigpt81vc

  An airplane travels at 300 mi/h south for 2.00 h and thk 5bt3 qs9o8chen at 250 mi/h north for 750 mile8 scqb3k9o 5hts. What is the average speed for the trip?

  In a 400-m relay race thef/ c,hez;q6x 54 z,f*sbvvfin anchorman (the person who runs the last 100 m) for teamfx ,4vnz/ c;vhe6sfbi q* 5,zf 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 10 s.3*k; - qm1a6izihb ieu The car's average velocity during d- *h1ki uai 63m;qiezbeceleration was 42 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m -:fvwloqv(9p /s to 160 m/s, at the average rate of wqv: pl fv9(-o$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h acceleratesezu:btp052 j - 8yxuea 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 ajd/g h :j2fmt)*n vufw*-ios; ccelerates 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 constant acceler *gijw5s8vu/o ation of wvgo/5*js8iu $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocj )pq +aum.+yc; a +-iy-ltsrjity of 1.8 m/s experiences a constant acceleration of +ru qils-cm);p+.+y ja y- ajt$1.4 \; m/s^2$. What is the cart's displacement during the first 8.8 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed of wd hfa3+ k8-.ttdbh )p454 m/s strikeshd-3.k 8)t fh bd+watp a sandbag and penetrates a distance of 81.83 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is :x2pleafn 6lvx5 w(7nlaunched from a catapult on an 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, whap6l7:alv 2fxx nnw(5et is the length of the catapult?

  A car starting from rest moves with constant qew(/*: x qx0nukjy j6acceleration 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. x-4 alv2onwdb p(bf )w2wc 1(shxel.;What is its average acceleration?2sbc.2h -4we vna (1ld p (lfo;)xxwbw

  An object starts from rest and undergow3q i4kxg,a)n p gi)/jes uniform acceleration. During the first second it travels 7.1 m. How far will it travel during the third second npx) a iqgjw3,k)g4/i?

  An object is moving in a straight line with conff6uv.sr vm9u n at(pk*/)qo(c6k g4xstant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is travavk kxuu( 6mq)p46 rv*ts 9f.(cnfg/oeling at 10 m/s. How far does it move during this time?

  A car starts from rest a(n5. /nezrsp+zg5i bund accelerates 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 :kz(j2z sdt)idecelerate 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 been ow5.s5+p ayvcwaiting at the intersection starts ahead with a constant accelerati cwy+vs5p5a. oon 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 th ,ms fovruu,5,e surface of planet X where,,s5ruofu ,mv the 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 the surface of planetb1ut7awr9a1 /+; /hbxirxqtk X where the acceleration due to gravityt1/ 7hx1/ab ;x i9t+ab kurwqr 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 s2c yk4zjh4 ,jz* 4a./logh *gd d+:a nbnruaw0peed of 15 m/s on the surface of planet X where the accelerationr zh/wac l4kn o.b4g4zh n+udad:0a gjy,j*2* 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 sd (l+yhmim;s/q *xo/zz8u6 ma speed of 14 m/s on the surface of planet X where the acceleration due tomm6 /;szs (mldy8qz+h/ioxu * gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greater than2m3w oa0fjv*rm7a5;,e.fnywj m2 j ny 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler , 7naewyjr052fm;wfo vn3mjy.2*majto fall before you catch it?

  A ball is thrown upward at a velor r+svq;iw 92mcity of 19.6 m/s. What is its velocity after 3. 2rviw;s9q rm+00 s?

  A bullet shot straight up returns to its starting point in 13 s. k .gm9vfbej/w3u0 m;/qs s- bt What is the initial speed of the bullet?9-qe3gvbs 0 t./kmj;fum/bw s

  A ball is thrown straight up with a speed o 1t60cit:mo anf 36.0 m/s. How long does it take to return t6ic:0tatnom 1o its starting point?

  A ball is thrown downward from the top of a buildingvhh jw055v5 ko with an initial speed of 19 m/s. Ithho0k5w 5v jv5 strikes the ground after 4.9 s. How high is the building?

  A ball is thrown straight up9;idl 1jt:oqwh dt)r;2f3fq n with a speed of 30 m/s. (only fill in numerical value in the blanks);ifdot1 t2d 9 n;w3f:)qhqj lr
(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 a9ng13x g/aoo+1luy6 yac9y pm speed of 48.6 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 14 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 14.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the vee8j h 1dn.k xse.nb3(vlocity at t = 1.0 s?

  In Fig. below, what is the ve*, 6ge/u(b6v xxm ceytlocity at t = 2.5 s?

  In Fig. below, what is the velocity at t = j4yl*vq: 8:cmg otu(bno j1c0 r(/n mk4.0 s?

  In Fig. below, what is the velocitdr wx rji+ifn 8m4;:0ty at t = 5.5 s?

  In Fig. below, what is the average velocity sz ./: :swcojqnab+7ufrom 0 to 4.0 s?

  In Fig. below, what is thepp;70dra umh 0 average velocity from 0 to 6.0 s?

  In Fig. below, what is the 7uhor;l 3x+z nacceleration at 1.0 s?

  In Fig. below, what i4ky/1hdu f v4ks the acceleration at 3.0 s?

  In Fig. below, what is the average acceleration fro-kcbf hh jp6,9twq ::am 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 to 8.0hhtf88; h ee*o s?

  In Fig. below, what is the f)8rdq 8no,n0b wz11pu 2kaiddisplacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity?34jkk2co+ wga p.z5iy {speed|velocity}

  An object can have a va ytr:-qk98voi72vl 5vlhs/tu rying speed if its velocity is constant.

  The velocity of an object can be negative when its acc*b o.ca uptl6xf 8roa/r5z5m0 ud1fy4q-r5pb eleration is positive.

  If one object has a greater speed than a second 9ulm5vokcq0 +object, the first must have a greater accelerat0qkv9+umo cl5 ion.

  Two cars emerge sideo;,1;2ssdwwpd 8gxfd 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 as its acce m f5i;is.srfw* r7.cpyr0zm 9leration decreases.

  A baseball player hits a foul ball straight up into the air. It leaves t oq24v fo/pompx* .v5rhe bat with a spp2ovrq */5xfmv .oop4eed 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 to its accele tuk (hd9m6ztj0ze:n5lhwp,s7s ( n6 hration, how does it cha0nz6(d e6w ln k:sh7hjtzu(,mh9tps5nge if air friction is ignored?

  As a freely falling objec:+pbe -a ymfg5 fe-ts-t speeds up, what is happening to its acceleration, how degy:-taff +m e -bps5-oes it change if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its original position i crlzz()dwv()6uh,q/b0u y pwith the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this result be altered?quh)r6 b z/ (dlv(cpy,u)z 0wi

  An object can have zero velocity and nonzero acceleration at the samzeik3m ,f9y 4we time.

  An object can have nonzero velocity and zero acceleration at amkj26y -wfk5p8ed 0y the same time.

  An elevator moving from the se)vp)(h 5fd jdritni9 0cond floor to the fifth floor making no stops alon )p0ti )fj5dni (hv9drg the way has zero acceleration all the time.

  A rolling ball moves fro4h7frj z8-)ybthfqx6 8 w0nn pm $x_1=3.4 \mathrm{~cm}$ to $x_2=-6.8 \mathrm{~cm}$ during the time from $t_1=2.9 \mathrm{~s}$ 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 $t_1=-4.9 \mathrm{~s}$ is at $x_1=2.1 \mathrm{~cm}$ and at $t_2=4.5 \mathrm{~s}$ is at $x_2=7.9 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quart/tb iplu0dp io* -7p-0gcx3n5npk n;wer-mile ($1 \; mile = 1609 \; m$) track in a total time of 9.6 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, movi+.sg onoz:x4 fz,sc r6ng 108 m away in 10.8 s. It then turns abruptly and gallops halfway xss: g.f,6rcoo nz4z+ 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 from z 60wnn2b1 8u: po4v,jrruygq$13 \; m/s$ to $24 \; m/s$ in 5.3 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 from r.vj (vblt57 6kco0hn$19 \; m/s$ to rest in a distance of 57 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a spez b 8-o .sk;4xs/y*n(zjrb atpn(k*yted of $27 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.8 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentiallyk2(xnj;v 8 ntt top speed about nkt( t8x;v2jn$11.3 \; m/s$ in the first 14.4 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 f/zkjxy 586h6 ppj)r gcrom a speed of $17 \; m/s$ to rest in 4.04 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 p w die4k63)tt/ qtvb.qh o3:nat(- rnm long on the highway. Assuming a decele)o4 -tb6nphi. /:q taw(rt3d3ek vntqration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a trucv8s xe:;+o hr *mpr m9o3iw0*aep8ty2dz xbi(k 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).    $m$

  A runner hopes to complete the 10,000-m run in less than 30.0 min. A ./jgrp0jltp c*e l04xfter exactly 27.0 min, there are still 1100 m to go. The runner must th.p pt4jc0r /jlxe l*0gen accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$