Suppose that an object travels from one point in space to anoqh lz qa(g20mth/q865w ahb 1bther. Make a comparison bemhh q2hlb/16a( w q8zab50tg qtween the displacement and the distance traveled.

  When is the average velocity of an objectwkih6 * 6x 6xmk7tj0(w vo2dgl equal to the instantaneous velocity?

  A new car manufacturer advertisedtgp0fi* kx 4h2/ t+nni/ig3ns that their car can go "from zero to sixty in 8 s". Tpiixig*4k/gf+02n3 nn dhtt /his is a description of

  An object moving in the +x axis experiences an acceleratidx.x6riis2:d vhu9fzp g7+ 5y 4nsf1o on 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 /o 7hm4 sal*kfas it approaches a traffic light. Make a stateme4 7m*oks/fahlnt concerning its acceleration.

  Suppose that a car traveling to the West (-x directio3cfd8+w azt x9zz)e8zn) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleratioz+cz 8zf 9waz3 )edxt8n.

  Suppose that an object is moving withth8futik4fp +;bo.rn:ee) 6 l a constant velocity. Make a statement concerning ; lp:nttkrou.bfi6 h+4fe8) eits acceleration.

  If the velocity of an 1 h)s*j 3(vmwefrhgr)object is zero, does it mean that the acceleration is zero? Supp) r)1 *f3ghsvhe(jrwm ort your answer with an example.

  Can an object's velocity change directio -1 m*3+e s;umhlabbefn when its acceleration is constant? Support your answer withmbha;elsf*b1e 3m+- u an example.

  Suppose that an object is moving wit8us )m(gsf9fms 4 n 5fb3za3 n0km/mpsh constant acceleration. Make a statement concerning its motion wit5k ans szfmm0p 3msm8u)3(/ffg94ns bh respect to time.

  Can an object have increasing speed while its acceleration isutyo(qt* d7z9 decreasing? Support your ano9ty7u* qt d(zswer with an example.

  Suppose a can, after an initial kick, moves up along ;yxxyr2(r fr4qj+5p va smooth hill of ice. Make a statement concerning5j;y 4r fvpqr+ xy2r(x its acceleration.

  Under what condition is average velgdi v+qg uhs,82zuk:-ocity equal to the average of the object's init: guz2s -hg,kiqd+v8uial and final velocity?

  Objects A and B both start at rest. They both accelerate at the same rate. Ho+u3wjgksx k 7+fz;-u bh6fnv4wever, object A accelerates for twice the time as obunvx4k6+7f 3j fg;wzukbh+ -sject B. What is the final speed of object A compared to that of object B?

  Objects A and B both starjys /*grxpnb/ :1oho(t from rest. They both accelerate at the same rate. However, object A accelerates for twicohxgrb:/(yn* p1o/j se the time as object B. What is the distance traveled by object A compared to that of object B?

  When an object is released from rest at35m-r )s q wy; :idx/gaqydy/nd falls in the absence of friction, which of the following is true concerning its moxd-yys) wq;qa g3ty/d5/:r mition?

  When an object is released from rest and falls in the absence of friction, whicj 0j0fbxy6uk +jcoe52 h of the following is true concerning its motion? fyexj0o0ku6cjj5b+ 2

  Suppose a ball is thrown straight up. Make a statement about the velocik3ks o(97 8v ob)ng5unvz9wpi ty and the acceleration wh(wsiz9vo g n95k83n kvbo)pu7en the ball reaches the highest point.

  Suppose a ball is thrhp-0b -xr1q rzown straight up. What is its acceleration just before it reaches its hi--bq 10rx hrpzghest point?

  Suppose a ball is thrown straight,bb1 f ht.6y .vv8emtlpp:0un up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ba6hpvemu.lt,b 0vtb f:pn1 8.yll is going up.

  A ball is thrown straight ,a9o u(6yyy ;)eiaaxz up, reaches a maximum height, then falls to its initial height. 9aiz )6;oyaayu y(, exMake 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 resv7 wvg(c3f r.gistance. Make a statement concerning its acceleration.7(gcv.wr 3gfv

  Suppose a skydiver jumps from a high-flying plane. What is her acceleration whembyr *1i f(ot/n she y /* rtom(1fibshe reaches terminal velocity?

  A ball is thrown vertically upward witbi 5qmtst y;z46fzpb:j6i6 o*h a speed v. An identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the seconizyq5pf :b 46i6s;o6m jt*t zbd 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 u v0v1.:umuf+i)tcvm building. One second later, ball B is dropped from the same building. As time progresses, the diuuc+fium vv0:tv)1 m .stance between them

  Ball A is dropped from the top of a building. One second later,cxb/efeeiq7g-;6f 4 g 4 ilg-r ball B is dropped from the same building. As time progresses, the diffegif -gcl/f -e 4e7ixgb;6rq4 erence in their speeds

  Two objects are thrown from the top of a tall building. One is thrpnl n-x2yj rbj.*b65 ,pt jdr8own up, and the other is thrown down, both with the same initial speed. What l5 xdrb,t yn j-.bjp*rjn28p6are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick isnw6q r5cxr5 .tb 4(v zk9jnh6d thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the 6nbw5rt4rcdhx v5kqjz9n (.6accelerations of the two bricks.

  An object is moving with constrydzn 8len-z ;+z(/se ant non-zero velocity in the +x axis. The position v-+/zeez(r dznns ;y8 lersus time graph of this object is

  An object is moving with consta8cr *tz3n ak1xnt non-zero acceleration in the +x axis. The position versus time graph of this r3atk* 1zcxn8 object is

  An object is moving with constant no;b9j uv3:rbs ynl.jx;n-zero velocity in the +x axis. The velocity ve.sr9: bjj;; ulnxb3y vrsus time graph of this object is

  An object is moving with constant non-zero acceleration in the +x-ib(hzo o 8fn* y*map. axis. The velocity versus time go(ap*nofy.m-i *b z8h raph of this object is

  The slope of a position versuo *z5m wmh)nsvx3o;1d s time graph gives

  The slope of a velocity kjn y9)(x/stepjl t0;versus time graph gives

  The area under a curve in an acceleration versus time grap;7k mu) krgix*9+g l;3j ouvash gives

  The area under a curve in a velocity versus time graph tbzj)4ndfd 91 gives

  If the position versus time graph of an obj:z rypc2) ),afokh) yxect is a horizontal line, the object i: )opcf2 r)yyxazh)k, s

  If the position versus time graph of an object is a vertaz64 ngf0; w23ehit iyz9bha8xvun16ical line, the object isgh 21;6 6f8nieva49xhzb3nt0i zwa yu

  If the velocity versus time graph of an object is a)7 q sak.98k-z2 x8m bpoxgrm-+tv zfm horizontal line, the object is zzbm pkkx).srqxf8 - -v87t g2+m9mao

  If the velocity versus time graph of an object is a straightzi n-tnw7-d 4mzike-h j :nzpk1wj5:6 line making an angle of 30 degreese -t4:pw kz17jz5:n- wjm- zhi6i nnkd with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Fin0afcylr -a 5g:h-, ibdd both the distance traveled and the magnitude of the displacem hfa,5lb-0dc:y-ra g ient vector.

  A boat can move at 30 km/h in still water. How long wir:eqr: dp4j f+ll it take to move 12 km upstream in:4r +qrj: pfde a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi qly(wxt93s. i74arjc h l9x)e= 1609 m)

  What must be your average speed in order to travel 350 k-8 rwiqibim 26m in 5.15 h?

  A runner ran the marathon (approximately 42.0 k yb-yj77dnii t:4gs /im) in 2 hours and 57 min. What is the average speedibdi ng7y4tsy/7 :ij- of the runner in m/s?

  A car travels 90 km/h.(v w*tpqvzcoz +tt;hy3. ;*ul r*, izg How long does it take for it to travel 400 km?

  A ly (light year) is the distance that ) zf2axopj8*y4m x2felight travels in one year. The speed of lightfyj*2)xe 4ox 2z mfpa8 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 yovq:lhj9l gn0a*6,x t09 gamfhu look to the side for 4.0,:fna9gq v90 lhgal*thx0 6 jm s, how far do you travel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, yournwj y.i8,psxba0*2qzb4ht1a 6 ffd i- average velocity n jd. h* 86ba4a i qxpfiswzf-0y2,t1bis

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 t(b143td 9k vml3pltt km east, then 1.0 km north, then 1.0 km west to return t(pl4d btt ttvm3lk3 91o 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 3 q,cbynn8di;.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to req i ,bd3nc;y8nturn to its starting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from sf y,*hpn aku7.chool 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. How far is your hometown fro7fak*p.,hy un m school?

  A motorist travels 160 km at 80 km/h and 160 km at 100sb;hmhs8+ :spmf b00v km/h. What is the average speed of the motorist fo:ssmv0+h f8;b 0s hmpbr this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h athirc;.uaik fm5g w:2( 100 km/h. What is her average gm5r2uc ii;w .h(:kfaspeed for the trip?

  An airplane travels at 300 mi/h south for 2.gz ,)9pott usra o(p7t7; cy3i00 h and then at 250 mi/h north for 750 miles. Wha9ztp7siua,37;(go yco) rtpt t is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who rjktq* 3yqzu(5uns the 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 runner not lose the rac*qqt53zj u(yke?

  A car decelerates uniformly and comes to a stop after 12 s. The car's averagek b :+fmsvus) m332 zyxqs*zr/.e ej7e velocity during deceleration was 73 km/h. What was the car'ssz q er3+.sfesxukmz2 evm)bj37 *y:/ deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the averageth7.wmgw 1 1tr9gn c2n rate of 7 121gtntn c gwwh9.mr$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rate ofr1ig ez7e9r1mbd /vf* $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from rest and accemga* yx7 becgonh *x--7g*,n;j ojp 6elerates 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 5d-rxnaa u, 5)ivy.buspeeds up with a constant acceleration obnridu5) a,-a.u v5xyf $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initia6evob ok- 1gc;l velocity of 3.2 m/s experiences a constant acceleration of 6b ko;o c-egv1$2.4 \; m/s^2$. What is the cart's displacement during the first 5.4 s of its motion?

  A bullet moving horizontally to the right (+x direction) wituqol8 s 1lffg; i2ll.(h a speed of 481 m/s strikes a sandbag and penetrates a distance of 42.05 cm. What is the average oli; 1gulsll(f8 .2qf acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult og( pj y; ,31 xl(lvklhev:tss-n 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, what kvs-,s( :(lp lexl hv3 y1gjt;is the length of the catapult?

  A car starting from rest moves wifkixnj9k+kje57l ;. uth 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. What is it* nhj4w-a8f+ob q kqx5s average acce+w 5nq 8*x4kfa jbhqo-leration?

  An object starts from rest and undergoes uniform acceleration. Durinw 5o7:wide-zyg the first second it travels 8.6 m. How far will it travel during the w wido75 e:y-zthird second?

  An object is moving in a straight line with860m1 pyybijhj/j o5h constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this time?yh8j10b ijj/ p65 oyhm

  A car starts from rest and accelerates gd 6xgd*n3i f:n)(h aruniformly 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 rbijoti bpla72n3*yfl .+6 *yp oad 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 turns green, a car that has been wait* yti;yx 9jf8*ok.rqt ing at the intersection start8*r9k .;ojyxtq*yi f ts 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 on the s*6z ph z7p6 dt:n7q3 m7myrjwkurface of planet X where the accelerationh:7*6tzwpm7km6j3 rzd y 7 npq 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 thnn)s9gapk1; c e surface of planet X where than1 ks ngpc9);e 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/ui5:kg xns ,:;i ;yhzus on the surface of planet X where u,uh:kz:xgii; 5; synthe acceleration 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 a speed of 14 m/s on the surface fthng.q3zp 98gdwi /di .pr.l,c, x0z of planet X where the acceleratiori8 l9c3 wtd.fnz/.qxggp,.z 0dhi,p n 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 if2+wp jhqf0r(0pt2bab w35i1+uwhv than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the r0h+vqi p2 u2itwhb3bfa10j r5f(wpw+uler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. 17cy)d l74c+nigb z hs What is its velocity after 3.iylcn+sbcd47 g zh71 )00 s?

  A bullet shot straight up returns to its starzw-a/u lm)i9eting point in 4 s. What is the initialimwa/ue)z-9 l speed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How lx-vup6h g7fi20f7 wwuong does it take to return to its staif7g-02 6 vf phxu7uwwrting point?

  A ball is thrown downward from the top of a building with an initial speed t/x7jzzq6zp7op797 w *en sdcof 13 m/s. It strikes the grou/tqo*7wdj77 zsz x 9e 7cn6pzpnd after 4.7 s. How high is the building?

  A ball is thrown straight up o; x7a n:csq f8 ekxhf7t+u8d+with a speed of 30 m/s. (only fill in numerical value in the blank7tde qf:sox8n k7ac +x+ f8h;us)
(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 5;amk q9gvi;vspeed of 37.4 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 velo 1cl*u5 s/nhud/ee1h sw29c uncity at t = 1.0 s?

  In Fig. below, what is the :x c 9ee9qlh0kvelocity at t = 2.5 s?

  In Fig. below, what is the vel 0))qnshb1*+ z(jnkj0gmzp- ipynf5c ocity at t = 4.0 s?

  In Fig. below, what is the velocity at 2qrsr h)kvo9 h) cn24et = 5.5 s?

  In Fig. below, what is the average velocity from 0 to 4u2d nav0k;eg.n f5 6fs.0 s?

  In Fig. below, what is the average vfxj(s 9;no k nbsns+giy)s5zhpy5 ---elocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration at o186,llv l+wzj(vc t b1.0 s?

  In Fig. below, what is the acceleration atgb+ r6onal gx6h)(ax8 6bzk u. 3.0 s?

  In Fig. below, what is the avehn l kih-0kt./9+ye(de d3 clerage acceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration : 6)a v68 +luytafibcmfrom 0 to 8.0 s?

  In Fig. below, what is the displalscb+ gf.id88 cement from 0 to 8.0 s?

Does a car speedometer measure speed, vrc tytbi11m2ce1. yv1 elocity? {speed|velocity}

  An object can have a varying spew 7c0,a70rssq bb/ynjed if its velocity is constant.

  The velocity of an object can be negatkzg ;k 06zvs7dive when its acceleration is positive.

  If one object has a greater speed than a seczss 1b1acu dtk/i8jh 8ssue32:qq g83ond object, the first must have a greaterq e2jbshiqd3sk 1g183:tzua css8u/8 acceleration.

  Two cars emerge side by side from a tunnelmt1kshaymoa d1i dg5 6z2a .2:. 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 increasi vyhcc3x4b 1qtv: y+1xng in speed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the afg3 msoxf0s3mv-oadn5/ +w/ h 2b,90 qzyigtn ir. It leaves the bat with a speed offa/gy9 msxf/ ,0 tn5hi3n+ g -oz3v2do sb0wqm $120 \; km/h$. 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 acceleratiouow sn4q4-p s4-adsby 0bfj( .n, how does it change if air friction is ignjq4 pa bn-s w.0sdu4y fobs-4(ored?

  As a freely falling object speev6(nom, - 6egekjhs/.ip4 zl5qjoe ,zds up, what is happening to its acceleration, how does it change if air friction CAN NOT be ign,z(v 5 4,eohi /l6kgmsj-nz6. eqoepjored?

  An object that is thrown vertically upward wdekrse 5z6(+klt-ide-lkzl1 +-j.x q ill return to its original position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how ejql--zre+ l1 d.+xs- dtl(k6e k 5izkwill this result be altered?

  An object can have zero velocity and nonzerot+:x*kv 6sikr acceleration at the same time.

  An object can have nonzero velocity and zero acceleration 8m/n 4x2au5g ttm8ubykcd 8q.at the same time.

  An elevator moving from the second floor to the fifth floor mak mf 809gvax;4 8buuouevnv0; hing no stops along the way hauvx;e;o0 u8u4ng8b vfm v9ha0s zero acceleration all the time.

  A rolling ball moves from /qj qoo1(k ns,k4c +gfd:y8 mh$x_1=2.0 \mathrm{~cm}$ to $x_2=-8.2 \mathrm{~cm}$ during the time from $t_1=2.8 \mathrm{~s}$ to $t_2=5.8 \mathrm{~s}$. 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 $x_1=2.4 \mathrm{~cm}$ and at $t_2=3.6 \mathrm{~s}$ is at $x_2=8.4 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps a +*mw.gtd ka,lround a quarter-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 train2l/72zyrj: 2lxpd cu fer in a straight line, moving 105 m away in 8.4 s. It then turns abruptly and gallops halfway back in 4.7 s.7 :plfd /ul 2rc2z2xyj 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 r;:e7cg4m v g8pguo d9$12 \; m/s$ to $24 \; m/s$ in 4.7 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 fro9e qgw6zg7 z/km $20 \; m/s$ to rest in a distance of 76 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must react/hj/tfu46 *le e ap:zh a speed of $30 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.0 \; m/s^2$ ?  (数值)  $m$

  A world-class sprintebsts s:5 )i(pu8brv.nr can burst out of the blocks to essentially top speed about t 5spbsnvr)b .:i u(8s$11.4 \; m/s$ in the first 12.9 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 fr rm0xwlaer5x *2q0;u 0s yp6wdom a speed of $17 \; m/s$ to rest in 5.52 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 on the higr hl)j1aci u13jhc1v8 xiv7/y 9o6msohway. Assuming ahox91j31i)v16cjurycsh a/i m 78lvo deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a trd8zfn arwm3 ;vww ()uw(,unp7uck 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 rm4 s d il55v0bn)7qqzthan 30.0 min. After exactly 27.0 min, there are still 1100 m tv50zb)mn7l4 qi 5dsqro go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$