Suppose that an object travels from one poiqojfu89z6f 6 zl1n r2hnt in space to another. Make a compari1 2n6ozhru9f8 6lf jqzson between the displacement and the distance traveled.

  When is the average velocity of an object equal to the instantaneous velocit:0; ,c2c(p zc.cokg)piowys k y?

  A new car manufacturer advertises that their car can go "from zero to sixty gblf 0nha ro6eo/)s4:c hshvc31e-3 ein 8 s"n1fc-:h ah3 gs/vser l6o3)4 bchoe 0e. This is a description of

  An object moving in the +x axis experiudvy7 :tq) )olences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car t)a: marth+f h:vi. )ixraveling to the East (+x direction) begins to slow down as it approaches a traffic light. Make a statemeni )mfv th.::r)xia ah+t concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to sloya7c(:c i1x/c-oz oeiw down as it approaches a traffic light. Make a statement concerniniy io(ae1:c zx c-/7cog its acceleration.

  Suppose that an object is moving with a constant velocity. Mak+ t.z )56xujref,xj sqe a statement concerning its acceleratiouzsx+ ,qr) f6t5e xj.jn.

  If the velocity of an object is zero, does it mean th0,wo)+a8)*fgle ;7i l x2ngct ghj7nf0yqc jlat the acceleration is zero? Support your answer with an examg;x0 i*l nf7,y al n2wo fe8chcgj)tjl)g7 q+0ple.

  Can an object's velocity changq:vh5 y0k-xxp mg.jg(e direction when its acceleration is constant? Supp5vh .m(: g-qy kjxx0pgort your answer with an example.

  Suppose that an object is mriu*6 xl+l-pxoving with constant acceleration. Make a statement concerning it6xri* uxl- +pls motion with respect to time.

  Can an object have increasing speed whileb7q5ugm ; fn.x its acceleration is decreasing? Support your answer with an examp5ub7fnx;.mq g le.

  Suppose a can, after an initial kick, moves up along a smooth hill of iczk6z1y; + g;931yoiip fkamcs e. Make a statement concerning itk; 1 ;oi9fczs gm1y+ aypiz63ks acceleration.

  Under what condition is average vee4 lh2a ,l u9rnk/8viqp8kg1klocity equal to the average of the object's initial and finp,ki8a8k 2hr ku l1v eg9l4n/qal velocity?

  Objects A and B both start at rest. They both acceleropmn3,*on,sd, gnmu 7 ate 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 obje,omnsd ,npo37mg nu*,ct B?

  Objects A and B both start from rest. . tci;8 o6vkud7z gs)3s/sv dd 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 com3v 8 ;. ozuvi7dgsts kd)/dcs6pared to that of object B?

  When an object is released from rest and 703;qts(h *a neplasafalls in the absence of friction, which of the followingle0q3(st7;s* ap na ah is true concerning its motion?

  When an object is released from rest and falls in th-or jg9hldc;cjnzo-er42 )1i egu 6 0se absence of friction, which of thegn r)c9see o 1d;ju6-orh0z2lc -gij4 following is true concerning its motion?

  Suppose a ball is thrown straight up. Make a state w))aylfk6b2aq)s v,v ment about the velocity and the acceleration when the ball reaches the highest wa, )2fv)bal)qs y k6vpoint.

  Suppose a ball is thrown straight up. What is its acceleration jusmhk8n -d5f*o u6 1h9.wyq u*s id:1geczjexn2t before it reaches its highest qk 9.uneh8 yuehg*j1 s:6i* -d21mdwxznoc5fpoint?

  Suppose a ball is thrown straight up, reachekbnt) kz42j2i bl.l h8s a maximum height, then falls to its initial height. Make a statement about the direclibljk4.k zhnb 28 )t2tion of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximumexw :ig3fxbm3 q63gz/ height, then falls to its initial height. Make a statement about the direction offge3gm6 3wbzq3 x/x i: the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downwardjkq) :0 q4 -:z vspxba6gl jmo9bh/;lp in the absence of air resistance. Make a statement concerning its accele: o s94lg -jb6;pa/)zqq phjkblvmx:0ration.

  Suppose a skydiver jumps from a high-k2:efy-r e j(pflying plane. What is her acceleration when she 2r(fek-e :pjyshe reaches terminal velocity?

  A ball is thrown vertically upward lr 6o -sanu*oi/. ng u:;e(cyrwi-w 5qwith 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 second ball to that of the first ball? (How many times higher does the second ball go than uo/5qniyaol urecn(i- : 6w w*r-g;.s the first ball?)

  Ball A is dropped from the top of a building. One second later, ball B is dro3uc)gl1m cy;kxf 2n7wpped from the same building. As time progresses, the distance between them32 f7n1;m)gxcwylkuc

  Ball A is dropped from the top of a building. One second later, ball B is( bsuu67;kukx(zjvq27q y7 l l dropped from the same building. As time progresses, the difference in t;ul(ujlsq(bz7x2 67ky 7 q ukvheir speeds

  Two objects are thrown from2 sy3p0yawd+4/ edziv the top of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit t0/yziyvp d+23 ds4eawhe street?

  A brick is dropped fro yswk: m t-fh2h22o w3cz3)izcm the top of a building. A second brick is thrown straight down from2cs zk)o hf:zww 2im-th 32y3c the same 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 velocit*nnp 394/ c naclstj(hfjq4o+(byc x.y in the +x axis. The position versus txjja/n9s4 ((+ c hclptbcynonq3 .f*4ime graph of this object is

  An object is moving with constant non-zero accelerrq.su 53ay9aib my+6 zation in the +x axis. The position versus tibryz . 6a39iqam+s uy5me graph of this object is

  An object is moving with constant non-zero ver e 3p5q8te2cennzz ;y+vq68e locity in the +x axis. The velocity versus ti2qenez8 z58yt+;c nvq p36e reme graph of this object is

  An object is moving with constant non-zero acceleration in the +x ax-mg* lh6bq t(qq+e -itis. The velocity versus time g(hlg -mti q*q6b -+etqraph of this object is

  The slope of a position versus timnf0nai 2gi(e6 e graph gives

  The slope of a velocity versus vf xf 1z;/9holtime graph gives

  The area under a curve in an acceleratiwr66/:lquu3 gn1rb vdon versus time graph gives

  The area under a curve in a velocity versus time graph 1m6dj-e,ckpo zj.ocz() +xdggives

  If the position versus time graph of an object is a horizoj 6f 1t.t-nkxzntal line, the object i6kn- txt.fz1js

  If the position versus time graph of an object is a vertical line, the object i*f7za l5hgf4pltqq-p s9 8 gq:s q 5 tsq-pz p8f*l4hfl7gagq:9

  If the velocity versus time graph of an object is a horizo(to2r u odcc16ntal line, the object ic1u6 to2ocdr( s

  If the velocity versus time graph of an object is a stry/ uy v9z f09e(4mln 4brfld2in)o4iwaight line making an angle of 30 degrees with the tim l d/mv o2z0w4i )e9(iry ubnlnf944yfe axis, the object is

  An object moves 15.0 m north and then 11.0 m (*:o.nv ofvv *vtg(,y3-ew j.jrsx izsouth. Find both the distance traveled and the magnitude of the displacement vector.f ozvsniwe.r: y j*vxvgv*,(.- (t j3o

  A boat can move at 37hcahe3-tgfs :wol .+ou6dgar0; rh10 km/h in still water. How long will it take to move 12 km upstream in+sal6-:t0.rohef ;1ouwh g3dcr hga 7 a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 wt8gfc7gnw*, mi = 1609 m)

  What must be your average speed in order to travel ) c(v:*ukb* lwadk;jf350 km in 5.15 h?

  A runner ran the marathon (approxul8 (rvxma t bm,rd9, uap9-8qimately 42.0 km) in 2 hours and 57 min. What is the averag9 ba89-urmatq, vxup r ,l8m(de speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to.w vcr lgi,ck6e(3vq5 travel 400 km?

  A ly (light year) is the distance that li-orzt3v qeg6 1ght travels in one year. The speed of light t -61vg3oqzreis $3.00 \times 10^8 \; m/s$. 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 xq p7 06sgoqy:the side for 4.0 s, how far do you travelq:qy6g op7 xs0 during this inattentive period?

  If you run a complete loop around an 1epzc06fii)(q yh(skoutdoor track (400 m), in 100 s, your average velosf()160hi cpk iy(qzecity is

  A polar bear starts at the Nor00qg4nd0kwc0da e8la dq4 bi7 )koxh )th Pole. It travels 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 ako e)cq kd7n 0a al hiw044)8db0dx0qgverage speed?

  A polar bear starts at the North Poled r8.n9oqi j,z,kdenb;zu50z. It travels 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. kb9riz5o0z dnd,u;zq ,e.n8 j What was the bear's average velocity?

  You are driving home on a weekend from scho o q.5pv;bjymtrw(+ x7:mnrur,8z 7rmol 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 from schootby,q :;m mwr un(jm.x z77 8rrrp+5vol?

  A motorist travels 160 km at 80 km/h, vcx*k69zozh and 160 km at 100 km/h. What is the average speed of the motorist for this *hk6o z,x9vcztrip?

  A motorist travels for 3.0 h at 80 km/h :ms+usx+/gw9jfkvi m455ynpand 2.0 h at 100 km/h. What is her average speed for the snxfmm :54i/ws9+uvjg+ y 5kp trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 25 wmdj r5lya+5+0 mi/h north for 750 miles. What is the average spel5jw5+ ym ad+red for the trip?

  In a 400-m relay race the anchorman (the person who runs: 9uootq 06rcb 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 t6 q:c09o boruthe 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 comes6l(rnx: wkulr5336hxfti jn) to a stop after 11 s. The car's average vei jx:(3k6nfl r u3w5)6rx hlntlocity during deceleration was 70 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed f+w 2 .akypdt;ipmxe8 6rom 100 m/s to 160 m/s, at the average rate of k2;mdwe+6i at xp y.8p$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the ratesy +w)b)c3zxj 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 re1xa,y3v fl brq:4k vg*st and accelerates 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 uxlv) -qebx:p p30gi f.p with a constant acceleration of 0i:g)3lvq -px ebf.p x$2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 3.7 m/s experiences a constan4lq tuo/n, wwfe*9k h,t acceleration ow,u4, k*no/ 9t weqhlff $5.0 \; m/s^2$. What is the cart's displacement during the first 6.5 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed -j; wh+:dyjkvb*h mj 7of 435 m/s strikes a sandbag and penetrates a distance ky7vj;jjd +b :*hw -mhof 61.22 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrier. It.o. oqe9u :;gshd6ip t 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 lengtd9;eo..:iq h 6o psgtuh of the catapult?

  A car starting from rest moves with conproey zcg e*. .e8yu4-stant 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 iy0 m,0iugq(wv((ofuq) .oa- rugg)mits average acfgq.aqvo-gmy),00 )iiw uur g u(o( (mceleration?

  An object starts from rest and undefll-hmg6); sirgoes uniform acceleration. During the first second it travels 9.1 m. How far will it travel during tf 6;sm-iglh l)he third second?

  An object is moving in a straigippsq b) gdbf,(6+t.uht line with constant acceleration. Initially it is traveling at 16 m/s. p+ suiqg ),t.(fpbd6b Three seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest anw864 1a*hecl pug/cpz00kney d 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 decelerate at abo.s5 va jhi4lx*ut $5.0 \; m/s^2$ 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 waitinguku929nacw 0m at the intersection starts ahead with a constant acceleracun90m au29wk tion 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 wk wv6)dt kf4;eith a speed of 12 m/s on the surface of planet X where the acceleration due to ge4kd)6 wt kfv;ravity 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 planet X wdffq2-ml q0 w:mf9g )mhere the acceleration due to gravity ifwmq)2f l:-mqf90g d ms $1.5 \; m/s^2$. 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 surface of planet tokwfp +2bw :b:,b9m oc tf0zqa ./gf*X wheopbwqbco2w:,ktag bt m9+* ffz. : /0fre the 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 1l13nq5np1cumz )2 -e,wsm+ lv-vkh uf4 m/s on the surface of planet X where the acceleration duehl 5+ f wqemn 1m3-,nvkpusuvlz1c2 -) to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually)-rahw xo5)e q greater than 0.10 s. If your friend holds a ruler between your fingers and relea- hqx)) e5rawoses it without warning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. Whatonmog)0+e uimgcc2) d ni6i+ , is its velocity after 3.g 0 m+i),)dno6cn og+mi ce2iu00 s?

  A bullet shot straight up returns to its starting point in 17l1 k0w 1hk,jhdq3atj120 hapivhyrg4u v( 43a s. What is the initial speed i rvay1012j3 v0aw 43ht(hhj 4pk,lak hg1qduof the bullet?

  A ball is thrown straight up with a speed of 36.0 m/4hom,6g 7jdmg s. How long does it take to return to its starting d47 ,m6gmg hojpoint?

  A ball is thrown downwazegpk . nxh21l o7vkf7q52/dvrd from the top of a building with an initial speed of 15 m/s. It strikes the ground afteez k/n.5 o12qv 7fkldghp27 vxr 4.5 s. How high is the building?

  A ball is thrown straight up with a9n hnck3. yco- speed of 30 m/s. (only fill in numerical value in the blanks93yhc-oc nkn .)
(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 speet.i2hmto r( x* lz28dod of 35.9 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 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 k crimw*b 4;nz- i)b8jgac8v /the velocity at t = 1.0 s?

  In Fig. below, what ih* 1 tg j21pcrx(4boyr+0fgac s the velocity at t = 2.5 s?

  In Fig. below, what is the velbrplf)0 i28ydocity at t = 4.0 s?

  In Fig. below, what is thetu5 i te4pyt/- velocity at t = 5.5 s?

  In Fig. below, what is the average velocity from pjr0upal0qj0gfen 2a:m s( 9.0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 to 6.0 sm/o ; wl:wv*ig?

  In Fig. below, what is the acceleratio tu+ qmrvk/*5tn at 1.0 s?

  In Fig. below, what is the ak. 1z 5inecx 7ea q+1f*vbajh3cceleration at 3.0 s?

  In Fig. below, what is the average acceldu*t2 1v clqut cl*0-c4.xgmueration from 0 to 5.0 s?

  In Fig. below, what is the ave okxuh f *lqak846(0norage acceleration from 0 to 8.0 s?

  In Fig. below, what is the d2: rt/bk6 yhm bymsd4kdy:c; 3isplacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|velop28.q(2g woi*epa pf ncity}

  An object can have a varying speedx mn/i :.j7ougky/dg 5n2 pqt; if its velocity is constant.

  The velocity of an object can be sip8m(cmv33dtfn+j;*cvbm 7 negative when its acceleration is positive.

  If one object has a greater speed than a second object, the fd)6 yaahryl 4yq3yo r;/:hrk /8+mkerirst must have a greater accelhmrr y;q yay4d8r/kl)+ y/3raok6 :heeration.

  Two cars emerge side by side from a tunnell ,+;jf a/molj. 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 accelerkeeqym)t+ i pve.9:l 4ation decreases.

  A baseball player hits a foul ball straight up into the air. It lea g +;/vuq+ dduom6dgrbtu 0(lf ;vk.,lves the bat with a speed ofq+,mbkgg;ul vr ;dt .f 0(6 oldu/udv+ $120 \; km/h$. 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 acceleratikflgk +g2*a zkkh3s,a1 zwu/,on, how does*3ak ,/+hw u1g 2 k,kalkzgzfs it change if air friction is ignored?

  As a freely falling object speeds up, what is happening to its acceleration, i4xk i0 09fisqfo8ogad.fl 82 how does fqkolo9s f 00d8.4 gii2a8i fxit change if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its original position tqpd-, 8t x 1f3mo4q,c,agwldwith the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this tql 8ow 1 43tg,pcd-mxfdq,a,result be altered?

  An object can have zero velocity and nonzero acceleration ow 0w,/1j8mz7, ez-tpycirtw at the same time.

  An object can have nonzero velocity and zero ac gs ,y3p7v m6 *+yc9dpit;mklbceleration at the same time.

  An elevator moving from the secondi/gu)a*zsh2 g floor to the fifth floor making no stops along theg *h z2u)a/gis way has zero acceleration all the time.

  A rolling ball moves frs(p);x2e v :xqlt *fi mk*b85yblwz(m om $x_1=2.1 \mathrm{~cm}$ to $x_2=-4.7 \mathrm{~cm}$ during the time from $t_1=1.5 \mathrm{~s}$ to $t_2=5.2 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.8 \mathrm{~s}$ is at $x_1=2.2 \mathrm{~cm}$ and at $t_2=3.3 \mathrm{~s}$ is at $x_2=7.5 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight c, wbedsx iwuvfx z0 v2)w3-) r6o7gdy1ky0bc:omplete laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.5 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 straightii(-zzr x, lr6 line, moving 97 m away in 8.8 s. It then turns abruptly and gallops halfway back in 4.8 s. Calculat (,ri6r z-lxzie (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 f/x8 g41ykjvj$10 \; m/s$ to $24 \; m/s$ in 5.6 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 frockw;etz ra,ot8v,) h5m $17 \; m/s$ to rest in a distance of 65 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a isgq t49w+x.cspeed of $26 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.1 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the brm7fcfq77 (t9x5 x.kgv b4 1un)aefkplocks to essentially top speed aboutfvugfrxef b91 5pxa7)c(.n4 kqmt7 7k $10.9 \; m/s$ in the first 14.7 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 uniform,b3jgh4nqe 13an i:w6 npd;phly from a speed of $15 \; m/s$ to rest in 5.44 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marvwx2cp)v+yw-kbtv72,- uj z wks 92 m long on the highway. Assuming a decele vvw kpxv-+ut jwzw2c72b- y),ration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck g-elhir0ox3 5;e/szseoing $25 \; m/s$ 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;ycb,rv / a rrd9-:)djj5azji less than 30.0 min. After exactly 27.0 min, ther/ ajr y;i)b-jz:59 ,dvcdarjr e 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?    $s$