Suppose that an object travels from one point in spacclj2* si8psp: 2u pjjj532lg daip n,)e to another. Make a comparison between the displacement and the dis53jai:lj2p pdil8j,p*ugjcs) p2 sn2 tance traveled.

  When is the average vel6hqwznjh2q;u5+ zfw/ocity of an object equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "fromdkoz2 5/nt(y ohka j jop7*9;m zero to sixty in 8 s". T zd/kao *2 m(7;y kojp5ntohj9his is a description of

  An object moving in the +x axis experiences an acceleeet ;d:v0e boz-+ ;lveration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x2c0;fc w3qsv-ud3 gq2z sl9le direction) begins to slow down as it approaches a traffic light.s3scvl9 u23eqwc 0 ;qlg-fd2z Make a statement concerning its acceleration.

  Suppose that a car traveling to the West 7ufvg;d5*k i a(-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acvg duikf5 a7;*celeration.

  Suppose that an object is moving with a cvd))b5ao/jh ybxp8j2 onstant velocity. Make a statement concerning its8bja)db2)/y5xv jh op acceleration.

  If the velocity of an object is zero, does i4ovp,aoc7-/w ake/ek d 67mwqt mean that the acceleration is zero? Support your answer wik/4wq,7ce7koaew/6a vdpom -th an example.

  Can an object's velop / w79 4lq,499kpsibtoipy evjpt :7dcity change direction when its acceleration is constant? Support y 9k/,p d9 pst4ppivbyiwo9lq7:7 j4te our answer with an example.

  Suppose that an object is moving with constant acceleration. Make a bqz)9v*htj2k:5 nqcy statement concerning its motiot5z*v jyh9:)b2kn qqcn with respect to time.

  Can an object have increasing+wl5ui;8rl b a speed while its acceleration is decreasing? Support your answer with an w ;il+8a blr5uexample.

  Suppose a can, after an initial kick, moves up along a smooth hsmrhk y1z / rtd-v v8)u eox8p5,5t/srill of ice. Make a statemp /z/58ruxo)1rrst,-8 kydhvt m sv5 eent concerning its acceleration.

  Under what condition is average velocity equal to the average of the g4dlu107o (os) x msooobject's initial and final veloci1oxl0o7g4od( ) susmo ty?

  Objects A and B both s5p/h(axncw ;qez vgy3 m-ex96tart at rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to that of object9e5x/w e3q-6 ynp gx;za( mcvh B?

  Objects A and B both start from rest. They bothq1 :j0jz 3ismj 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 om1ji z:s30qjj bject B?

  When an object is released fromfyx0i i/)prdmw 3 o3uu;u/5 om rest and falls in the absence of friction, which of the following is true cri;uf3p u y)wxo /3um /dim5o0oncerning its motion?

  When an object is released from rest and falls in the ms2ff ay6xr/v :4y /2ys-zustabsence of friction, which of the following is true concerning its moty a:v /2sfuys/z-4sxymtrf62 ion?

  Suppose a ball is thckfl( y,1w*f92qqsy hrown straight up. Make a statement about the velocity and the acceleration s9h w*kfq(qf, c 12yylwhen the ball reaches the highest point.

  Suppose a ball is thn/z/2 z7c*n q aimj0gqrown straight up. What is its acceleration just before it rmzqi*/g2znq nc j/7a0eaches its highest point?

  Suppose a ball is thrown straight up, reafnku 0j0 :i60dg s)xjdches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as ths0xf0j jukgn06ddi): e ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls to its initiakxv6+k ytc; j1l height. Make a statement about the direction of the velocity and acceleration as the ball is comi6 ;k tc1+xvykjng down.

  Suppose a ball is thrown downward in the absence of air resistance. Makeo n mn;mvwwpay34.lk (e4y,+ar95 ygn a statementmg ,nyr( nywl.ka o49nv 4a3wype;m+ 5 concerning its acceleration.

  Suppose a skydiver jumps fj 6bdgs/(jls4gl)k ) urom a high-flying plane. What is her acceleration when she she reaches terminal veloc)bg/) l jk4l sjsdu6(gity?

  A ball is thrown vertically upward with a speed v. An identical senaxn c9p6t; 3rcond 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 first ball? (How many times higher does the second ballcprn9x; 63ant go than the first ball?)

  Ball A is dropped from the top of a builohka2y2s l : ,p;1asy9lfuxd-n04l 9. slefx ading. One second later, ball B is dropped from the same building. As time progresses, the dis0yludxs:o9.k 9xs l p2lf-slf he12yna ,; 4aatance between them

  Ball A is dropped from th3w ib,t efu6fi/n,1eb zzs;p//k iy 2re top of a building. One second later, ball B is dropped from the s;nikyt,6/i/bee pfu/b1rwz 2s3if, zame building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is the w fh6t*t3 efa58lkvqx6 fx 0oe,8hs9rown up, and the other is thrown down, both with the same initial speed. What are their fklh6tew 69 x38v q,she*xae850 tffospeeds when they hit the street?

  A brick is dropped from the top of 4m.kuxu7 z i/xbi.t2, t k9 psu,xiu2ia building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the t/2ii.iu .uku,z7p2 t 4 kumtxxxibs,9wo bricks.

  An object is moving with constant non-zero velocity in the +x axis. Tol uw/ q)t(uk1he position versusu/()utoqw1lk time graph of this object is

  An object is moving with constant non-zerbl2b e e;d, py0(3akager+:lp o acceleration in the +x axis. The posi0e;2lkgp(b:beea3ly,da r p +tion versus time graph of this object is

  An object is moving with constant af,p+7p bb9vlnon-zero velocity in the +x axis. The velocity versus time graph of this blpb +97af p,vobject is

  An object is moving with constant non-zero acceleration jtevh/,0g) wzz 8(fxse/ 8yze in the +x axis. The velocity zte 8vzge0s/8, wjfh/ez y( )xversus time graph of this object is

  The slope of a position ver25.zllk/;g pix(q eg sw1wyi3sus time graph gives

  The slope of a velocityupxv18lcwx t4w;(u p9: 04m ghp:txot versus time graph gives

  The area under a curve in an acceleratiojirlhdc 7 7:nxi 2vd88n versus time graph gives

  The area under a curve i5y6lofx1h l1)rx3cwz n a velocity versus time graph gives

  If the position versus time graph of an object is a horizontal line, the objey a/kk x:tw*i*ct kt*:/yxia k*wis

  If the position versus time graph of an object is a p4w, v /ija2uyfboz3( vertical line, the object isw4bvzf2 , apij/3yuo(

  If the velocity versus time graph of an object is a horizontal li7 lj2 zx1ma6exne, the object i1el2 a7mzx xj6s

  If the velocity versus time graph of an object is a straight line 2hx34b f*o4sn(plzkkp o; pg(making an angle of 30 degrees with thepnp 4bp3( k4xo*l(s f zho2g;k time axis, the object is

  An object moves 15.0 m nor c.rlettenjc;s52) g ,th and then 11.0 m south. Find both the distance traveled and the magnitude ej)2 ,5negrc.t ;c ltsof the displacement vector.

  A boat can move at 30 q u( z13n1vniico .entu c.79bkm/h in still water. How long will it take to move 12 km upstream in a river flov9. o(ect3q nib7iu.zn1n1u c wing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi =-,md( 9b .wioijxh. sbu s3x6p 1609 m)

  What must be your average speed in order to t6ah*)ot fljmmfz9( e (ravel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min. What 6y+;lz+ g6uvalh4 pr pkd9na.is the average speed of +vpl9kr yp46;.h ngld+ zua6athe runner in m/s?

  A car travels 90 km/h. How long does it take for it to travel 400 km?l 58i+xblr jjz0q:p m5

  A ly (light year) is the distance that light travels in one ye1r+: m8fn(idj;drms o ar. The speed of light ndjm1rm(8: r; sid+ofis $3.00 \times 10^8 \; m/s$. 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 ltq1od. b 97sfs( xwd4kook to the side for 4.0 s, how far do you travs7dxq 4sf.k9d1w (t obel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 176m l,1grn*a ;-p7vmo hdp zob00 s, your average velocityp nrhz;6lg,-mo mv do*pb77a1 is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 kusi1n7h6v(k ;0pb f1y7 uqgnn m east, then 1.0 km north, 1hq7gky7nn0 v usf ui61( p;nbthen 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 1.0 km south, then pa 4)1dc*tnzy1.0 km east, then 1.0 km north, then 1.01dap4z y *)tnc km west to return to its starting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home opyx8 q-e;9xlsn 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. exy-xpq9 8;l sHow far is your hometown from school?

  A motorist travels 160 km/c 3. vs) mnuxkv*oub9 at 80 km/h and 160 km at 100 km/h. What is the average speed of thxo u.9nvs*/c3 mkvb)u e motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. Whalw0dn+ t 6lhe-5uwmc 5t is her averagedntle0wh w6u+l-5m 5c speed for the trip?

  An airplane travels at 300 mi/h s(l-a x26 .lo d.maj ;cjg+wiyyouth for 2.00 h and then at 250 mi/h north for 750 miles. What is the average speed for yalol6j+w y; 2.caim -g jx.d(the trip?

  In a 400-m relay race the anchorman (the person who runs the last 10: 51s+y -xvfu,f rqvan c(if0r0 m) for team A can run 100 m in 9.8 s. His rival, theviuxqr (fy srf- 1fac50n: +v, 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 a2t2 utzfz 5-cfverage velocity during deceleration was 67 km/h. What was the car's deceleration while slowin 5z 2cufztt2-fg down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the average r0;pl)r jjlosk ,de *(eate of rk *spjjl);de ,e (l0o$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates atft5q+y-,pb 0txlegh0c4c i(tt o2:j n 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 acceleraf jbql6 czj4*2t8 ,vpptes 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 spexlctasq9/hr3dh lg , l8:5 rj4tg4*vdeds up with a constant accelerationg 4t98:hls3dqaxr5lrvh gj, d/t *l 4c 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 7.3 m/s experiences gg1 ;kpa9 ;hx,tr0lpxa constant acceleration of l ,1p;;xxhkg r9a0gpt$3.2 \; m/s^2$. What is the cart's displacement during the first 8.9 s of its motion?

  A bullet moving horizontally to the right (+x direction) withog- t: ctc7d,(zjh v-o a speed of 297 m/s strikes a sandbag and penetrates a distance of 38.75 cm. What isco ghjd,-c(tv:7z to- the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft cfv snp54jxlh+1*c io )arrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assusc15)v+lpfxjo 4 ih*nming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with covfga3bg,j9 i9n x9:uzx 2v be,nstant 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 tf g9grudfz7xpd.7. (po 80 m/s in a distance of 200 m. What is its average acceler.ffdgx upp7(7.r9 zdg ation?

  An object starts from rest and undergoes uni+jzyvg : es,a91ch0 juform acceleration. During the first second it travels 1.9 m. How far will it travel duringjgc ay,h1zs0e: u9 vj+ the third second?

  An object is moving in a straight line with constant acceleration.+s/tlc 2 *yz(hiwa6 )zc5 drle Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move duiyse c2dl(6)haczrw/5tz*l + ring this time?

  A car starts from rest and accelerates uniformly at n 1p2v:rwq. *leu4y)xnd py7h (er/pu $3.0 \; m/s^2$. 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 tirej kvzt2vbco9- w;*s(zs on a dry road can decelerate 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 tur v+plfn+t*a /sl2 ur*pns green, a car that has been waiting at the intersllv2/ rf++p *snua *ptection starts 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/se 5-3cn bvt m;r 0-nyk7k ge;(p* lwgd7fgh5oj on the surface of planet X where t*g5hw ydbpek-j ntn7feo5r -lg0g( cv;7m 3;khe 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 sixe-1imk 960-uhiz; ,6 x9al sfrv elzurface of planet X whei 6xll is r,zk0ma9-1 ;zeev-xh96fiure the acceleration 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 speed of 15 m/s on the surfacef o ,s4,yuoxx5 of planet X where the acceleration dues5oy , xfx,4uo 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 a 0a at sdtf6) qu,*:n.w4dgvgn speed of 14 m/s on the surface of planet X where the act a, 6gf04ndqn.w*)ugvsdta :celeration 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 rupkuczyj ,c5c-fe82a( ler between your fingers and releases it without warning, how far can you expect the ruler to fall before you catch i,2-u8z5c ccekjf( ayp t?

  A ball is thrown upward at a velocity of 19.6 m/s. What is its vel2pejse eo -mj9,f1 n*bwd 2dt/ocity after 3.ed 9s,pnb2j/-1 odfwj mt2* ee00 s?

  A bullet shot straight up returns to its starting point in rhql +*r.bahet h6.xkt z0 eoiju9(/(13 s. What is the initial speed of the b6qxt rr/.a0hz j uhkte .(oelh9i*(+bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How low189qx,zkqs*z6:ww qql ( qytng does it take to return to its starting point?wq*ws9z8yqtk l :1w,(zqq6 qx

  A ball is thrown downward from the top of a building with an initial speed of n4h1a0 wgf9rfq zbi-e m366uk21 m/s. It strikes t3 emfrifknuqhawz -09b14 6g6he ground after 2.8 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numerical vv8sb c d; -na2n)vkpc9alue in t 2d9bc; cnpvks8)-vanhe 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 m9,kba 0xou1wof 41.1 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 9 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 9.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t = 1.0 se, xhu 4nt3w f14vv6sj?

  In Fig. below, what is the velocity at t = 2.5 8: spzvt3o3eds v/7.uf abn0ws?

  In Fig. below, what is the velocity at ttuqyf4 d78r g3 = 4.0 s?

  In Fig. below, what is o z/,()b s 7om7qojafithe velocity at t = 5.5 s?

  In Fig. below, what is the average velocity from 0 to 4.0 j7e8u:*ewy nl0 mie4g s?

  In Fig. below, what is the average velocity from 0 to 6.0 s?t qjy+k3jf ns .c*:xg+

  In Fig. below, what is the acceleration at 1gs vz;2m7*(cwep8c d-bo)wycf 9vq /x .0 s?

  In Fig. below, what is the accec5ev-czfp5:h94 wo y eleration at 3.0 s?

  In Fig. below, what is the average accele*hilt- 8a 4hwsusyw8,nml;1z c c1i:rration from 0 to 5.0 s?

  In Fig. below, what is the average accelerj+l*7zw1 q 0l f.2zhxbn lqmy+ation from 0 to 8.0 s?

  In Fig. below, what is the displacemente672s0pjp zc hco gh;; from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|vec++xs h)ei 2 0 wmubo-gq9c mj,50onvqlocity}

  An object can have a varying speed if its velocity is conzub gu;-igsmx u 6n1b/4:kt o(stant.

  The velocity of an object can be negative when its accelerjkdf *dfp*u c;-m 1vr(da 5kx(ation is positive.

  If one object has a greater speed than a second object, the first must have a gru ciy/6 .jdq1heater acce.1/ jcuidy6h qleration.

  Two cars emerge side b k2iwf3ot8vk5 )gcl6lhu:n )ny 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 speebbs4zof,io+i a02;qrd as its acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It lea: :rmpbh8f4 uzves the bat with a sz:bfh:rmup 48peed 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 acc4ag :,8cdntyjeleration, how does it change if air tn:ya8 jd4g c,friction is ignored?

  As a freely falling object vw rzn:y8gn uj+0 17fkspeeds up, what is happening to its acceleration, how do 0vgrn1jz:7uk+nfw 8yes it change if air friction CAN NOT be ignored?

  An object that is thrown)b8w6k r t0 4jhttd1qv vertically upward will return to its original position with the saj bh4wk) vtt6 80r1tqdme speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration at thl5, s1k0 xegphe same time.

  An object can have nonzero velocity and zero acceleration at the same ti ns;r:a6 w fuk:ta1*yime.

  An elevator moving from the second floor to the fifth fe+btq4 7)jz+ jorsw 2-btfcax 4c, d(floor making no stops along the way has zero acceleration zt x fr +e7 o-tqs4bc j,d4a2+jfw)(bcall the time.

  A rolling ball moves p0pjm /pwwsl:xf 3 o73from $x_1=3.3 \mathrm{~cm}$ to $x_2=-8.7 \mathrm{~cm}$ during the time from $t_1=1.4 \mathrm{~s}$ to $t_2=5.5 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.1 \mathrm{~s}$ is at $x_1=2.9 \mathrm{~cm}$ and at $t_2=3.6 \mathrm{~s}$ 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 quaiih,iz : 3n1,aq/inw hrter-mile ($1 \; mile = 1609 \; m$) track in a total time of 12.0 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 p2mcv1 9lnsh+p7 (jiha straight line, moving 103 m away in 12.9 s. It then turns abruptly and gallops halfway back in 4.6 s. Calculate (a) its sm (lj7i29pp1nv c+hhaverage 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 frox eg34qs0:d6ijkf9k p m $11 \; m/s$ to $23 \; m/s$ in 4.4 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 n om3codk 8v(byx2rsb, o3/7k $21 \; m/s$ to rest in a distance of 59 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must re( t;hfw2yl ds9ach a speed of $28 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.4 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the bl92ab6oi0cg2qp n ioc:ocks to essentially top speed abou2pq9i :0oc 6bo icna2gt $10.5 \; m/s$ in the first 12.8 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 spediiiwwj k/4- r jzoln7.6fl 04ed of $15 \; m/s$ to rest in 5.89 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, l1.ai dkuk:/oq 1lq9/m b mm4na car leaves skid marks 92 m long on the highway. Assuming a decel/qkm9oi : dbl1a14/mulkmn.qeration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck g p* 7l4brq-9:a:dmcns/okk2be g ni:n 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).    $m$

  A runner hopes to complete the 10,000-m run in l(eo3ef: kq1z84x4yyf by 8u itess than 30.0 min. After exactly 27.0 miq tz4ub3 i4oye ffx1:y8k8y( en, there are still 1100 m to go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$