Suppose that an object b/u /fip;l;dw,)2 bbyibv )j qtravels from one point in space to another. Make a compari2b,fd)bb/ilpwi/ubyj; )v; q son between the displacement and the distance traveled.

  When is the average velocity of a*a 7; rwg5:e bl,n:6e2bgl)vzl up rjcn object equal to the instantaneous velocity?

  A new car manufacturer advertis.ypy*vo )x3op0z *qqses that their car can go "from zero to sixty in 8 s".* )po*ysx 3.zq ypqov0 This is a description of

  An object moving in the +x axis experiences an acceleration 9t t(l5 c/s ;lwxti)kwof $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x d 9q)5hec9 fkre)qwlq -irection) begins to slow down as it approaches a traffic light. Make a statement concerningf9c -)e9qq)w rek lh5q its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to sbg8r(s b+f fdosp z1b1:6 cq/flow down as it approaches a traffic light. Make a statement conces1pg czs:boq6 r/fb ffb(d1+8rning its acceleration.

  Suppose that an object is tjr ks/p(fs ndi hp:4xl .;b.,zu-lg/moving with a constant velocity. Make a statement concerning its al tzsu, h(/r -4d gin.l bfp/jk;x.s:pcceleration.

  If the velocity of an object is g5u 4zty21mn5c .u igizero, does it mean that the acceleration is zero? Support your answgiuzu 5mcy1itg n452.er with an example.

  Can an object's velocity change direhzrr; ppg9 dr2ac ( -+e:sy)uoction when its acceleration is constant? Support your answer with;-9 orr pa e:phzry2)d(gcus + an example.

  Suppose that an object is moving with constant acceleratik)u ee351sks kon. Make a statement concerning its m315k ks)ee skuotion with respect to time.

  Can an object have increasing speed while its acceleration is decreasing? Su;pg+wlqg2h a 84p:zed pport your answe4hplgz+8 wgd pa;2: qer with an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice. l 2yh(mp2y ,dhMake a statement conc2p 2hh(yd ,ymlerning its acceleration.

  Under what condition is average velocity equal to the average of the object'sry xs;:xj0-nmcbi o-) initial and)0 c;:ji-rx- yxbomns final velocity?

  Objects A and B both start at rest. They both accelerate at the same rate. Ho-or)eext-vrxg yp ; +8nn15hp wever, object A accelerates for twice the time as object B. What is the final speed of object A com - xth5-r)erp8o;ngy v xenp1+pared to that of object B?

  Objects A and B both start from rest. They both accelerate at the same rate. o3 s5umc w q/);2ueydqHowever, object A accelerates for twice the time as object B. What is the distance traveled by object Asyedo)2m quu/q w;c 35 compared to that of object B?

  When an object is released from rest and r*juv*7t)z cvfalls in the absence of friction, which of the followrz u vjt*)*vc7ing is true concerning its motion?

  When an object is released from rest and falls in the abfqr 59d80htji sence of friction, which of the following i0t9 hfrq58dji s true concerning its motion?

  Suppose a ball is thrown straightxavqcb):x) t420b t s7 qaxl3y up. Make a statement about the velocity and the acceleration when the ball reaches the highest p)lq740yxxvsx:2 abt3 bca tq) oint.

  Suppose a ball is thrown straight up. What is its acc,k u q7mg)hz3xeleration just before it reaches its highest point?h)mxq3,u7 g kz

  Suppose a ball is thrown straight up, reaches a maximum height, then falls tq ; w+5l9ri4abama21 7-x kclk3(crkn0mecloo its initial height. Make a statement about97lx4kqamre mcwkln3-iok +c a 1l a(;520brc the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maxisp nk7j:b0ib d .3x-okmum height, then falls to its initial height. Make a statement about the direc7-odb k:kpj3bx.0i nstion of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the abse8dpip/ fc4 :ey(oeqm+nce of air resistance. Make a statement concerning its accelerat8e: eiy4m q pp/+cd(ofion.

  Suppose a skydiver jumps from a high-flying yepc+7yfasq,m b7g.; s nz73 eph(y1pplane. What is her acceleration when she she reaches terminal velo( .y7cn7 a ;hs,smgy p3ez1byqf p7pe+city?

  A ball is thrown vertically upward with aqpcyv (+70df z speed v. An identical second ball is thrown u0c(py+ z7 dqfvpward 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 top of a building. One second later, ball Bi/s) l.wrwy8ep( r:jn*9 mywy is dropped from the same bsy.*y l (nri)9pw yrjw/8 e:mwuilding. As time progresses, the distance between them

  Ball A is dropped from theyoi n,7fk to)s *zt q;0sh4;ge top of a building. One second later, ball B is dropped from the same building. As *yk),h70nf s qi4gsoo;ez;tttime progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is t)8y98 f kvbqf4krpzv2 hrown up, and the other is thrown down, both with the same initial speed. What are their speeds wh2b)y 9 48p8kf zvrfqkven they hit the street?

  A brick is dropped from tfi+5)xdrl4 cayvt3gehri 7om +*p 3 .dhe top of a building. A second brick is thrown straight down from the same building. They are released at the same time. Negl++i 53.hmitdgv7xr ayr*d34 e po)cf lect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in7x4 edv;m: .+r ieavdu the +x axis. The position versusei: ;+av4 dex mr7uv.d time graph of this object is

  An object is moving with constant non-zero acceler*nez+cqc1(q .q0x qni mod) *eation in the +x axis. The position versus time graph of this obje1c* q+eci * o) zmxn.edqqq0(nct is

  An object is moving with constant non-j.shkz () 0gutzero velocity in the +x axis. The velocity versus time graph of th0 h ust.(gzkj)is object is

  An object is moving with constant non-zero acceleration in the +x p r5m(t0g 1;5f jmv+tn.qchcj axis. The velocity ve 1(rpgcm.0 h+t;5jmcvtf q n5jrsus time graph of this object is

  The slope of a position versus time graph give 7dq xmtj/m +,m4clnli(e6bj- s

  The slope of a velocity versj/,m he h)*vu js13jbu/hjgm)7o;bs kus time graph gives

  The area under a curve in an accelert *lcvjbqh* l vc3 yk2 f6 1hur9-yzhjvm5u;)3ation versus time graph gives

  The area under a curve in a velocity versus kc9)e64x*gpzj2g * gsa-kcljtime graph gives

  If the position versus time graph of an object is a horizontal line, thea 16wyj1 xbmn. object is11mbaxjn 6yw.

  If the position versus -wdt,w xvo :a-9oe0altime graph of an object is a vertical line, the object isw ot,oelw :0x-a adv9-

  If the velocity versus time gnrjeav qoo,g1eg-qb.4. (;mcraph of an object is a horizontal line, the object 1 -.gmoqojrq;,gen.(vcb ea 4is

  If the velocity versus time graph of an object is a straight line making an anggg-6 e;osnnm )le of 30 degrees with the time axis,m-songe6 n g); the object is

  An object moves 15.0 m north and then 11.0 m sout+l g 9 )wo;7jkbdnf+a/ a.hiiih. Find both the distance traveled and the magnitude of th a.n7 +klii9h;bdfoj)/ wiga+e displacement vector.

  A boat can move at 30 km/h in still water. His.w +j eu -nh015eovmow long will it take to move 12 km upstream in a river flowing 6.es.05 n1 +vjweum-o hi0 km/h?

  55 mi/h is how many m/s? (1 mi = 1608c llqi kleb:y u1)/*j9 m)

  What must be your average speed in order to travel 3pzqh 1s(b33o:x ;gekb 50 km in 5.15 h?

  A runner ran the marathon (apprb+ zlylvygdf/ h10r-i5 )em-coximately 42.0 km) in 2 hours and 57 min. What is the average speed of thd0/1 fyi-rmy-celgv)+z h 5 ble runner in m/s?

  A car travels 90 km/h. How long does it 5uyqnhx m 2k4/3mxp qu1kh57t take for it to travel 400 km?

  A ly (light year) is the distance thaaps u j-7(;mkwc( ,fgwl)lx4ut light travels in one year. The speed of light i;x- s cw( mw7,u)lp4alugk(fj s $3.00 \times 10^8 \; m/s$. 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 rojdamt .b4esl9rh x 2t w93xz( s7mm3-yad and you look to the side for 4.l j3dytmx-97xh b4sraz92 twe.m 3 (ms0 s, how far do you travel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100; 5j*d*hjpcbqqelt: q d3l5(c s, your average velocity *dlbpql 5ehj3dctc:*qj ;(5qis

  A polar bear starts at the North Pole. It travels 1.0 kmj en/99k klzi2 south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting pokz29 jnel k/9iint. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North )mpb1+gcmf l 7p5grq6g e.yhd+l7vg 9Pole. 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. Tdr15lggh q6g.)lym p 7evg 9pb++fm7chis trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 miles.v48(ym3gr l olaa;x,nk+h ) aw It then starts to snow and you slow to 35 mi/h. You arrive home after drivoa ,ax)g lla;nmrv+3 h84(ywking 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 16*wur( m17rtq*gzco c 2jp) ,gt0 km at 80 km/h and 160 km at 100 km/h. What is the average speed of the motorist for thio p tc*gruw1,cj)tmz q2gr 7*(s trip?

  A motorist travels for 3.0 h at 80 km/a.3r4:bhzcp zx s6 hf*;fzx 3ch and 2.0 h at 100 km/h. What is her avera c3;*px3.64rf: zf bshahczzxge speed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mig +(;m:tnx op e15uid3hf9wli/h north for 750 miles. What is the averageu;1n( xhw5:9g dpeitl+3moi f speed for the trip?

  In a 400-m relay race the ap qye buk3nd9t+.4 1xlnchorman (the person who runs 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 el4 quy13 9bnd pkxt+.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 an rq;n / ipfue. ucdn3)i0;at(zd comes to a stop after 13 s. The car's average velocity duf3.u n0niq )iceuaz /r(tdp;; ring deceleration was 75 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the aveey:z5 xypoam9 g wt:*9 p6+ vxwe.u0brrage rate of v z *xpw6+b:aetyrg5op:xweu9.m90 y $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h acc*5d(swmm.2ko,z fb /y g+ bawk-8nkkxelerates 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 accelerata anwvsb z,;s02+2lbbes 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 accelerat0.j sun 2uxwrn:p8) cnion of j.n0c8) n2wu up xsn:r$2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 6.5 m/s experiences a constant acceler.b. 4h7 s0zyhvze6 zscation of7. hysz.hb v64sczz0e $1.6 \; m/s^2$. What is the cart's displacement during the first 7.0 s of its motion?

  A bullet moving horizontally to thblxqy(nu2z9m s o)b :8e right (+x direction) with a speed of 435 m/s strikes a sandbag and penetrates a distance of 43.38 cm. What is the 8: (zbqsnx)lymu2o9b average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from aa0 s b0oo1 zi0l k(3(a2m shrye1odem9 catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult(e90aaeom o0hm3 s1k1o2biszdr(y0l , and this requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from re1l jbgb9) xy6-do6/kvt3ijm ust moves 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 disl t8;oewz2v 8ttance of 200 m. What is its average acceleratiol;ewzv t t8o82n?

  An object starts from rest and undergoes uniform acceleration. Dur bkz; hgj( pyo 6kr/s/hm,b6k6 3r8ahding the first secon6y(ak3gh6k ;mrhd6p/sh o/zb rj k8,bd it travels 7.8 m. How far will it travel during the third second?

  An object is moving in a straight line with ) 33nv tg3nasw5ud dx j43u.zbconstant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 3 nbudz35das3g 3jxw.4 vn)t u10 m/s. How far does it move during this time?

  A car starts from rest and acceleratez/pqdyj z 4j2)s 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 deccm8r d k+38gkphohek(;7ncv+elerate 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 greeaflj0b(rcc /- -8 qchykm74tt1ke 9it n, a car that has been waiting at the in-h7m4y 8 k (b9qt0c-jt/c1raf ict keltersection 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/s on the surface of planet X n,,xh)z(kz ji where the accik)x ,z,j n(zheleration 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 planet X whejj3i3b lx/q5fu e)az+re the acceleration jiu/ab +efq5 )33xjlz 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 wit572 es2 mdvhnhh a speed of 15 m/s on the surface of planet X where the accem hv5h72 sde2nleration 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 ofmsf391r ho 2uf planet X where the acceleration due tou3 fh19m 2osrf 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 friqjg5n vp2jlw 6fiv1 -/end holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fajj - niv5l2/pgwqv 1f6ll before you catch it?

  A ball is thrown upward at s/v9-jdp8i2my2 m jux a velocity of 19.6 m/s. What is its velocity after 3.0jp djs29 m im8x-/2uyv0 s?

  A bullet shot straight up returns to its starting pointltul9,pf*e t( in 17 s. What is the initial speed ol(p9 te tuf,*lf the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it td6s3 nahj5a+ af4t6gee-ttm69 ; evys ake to return t;eesg5e tyd6jh f s4 6-mt3t av69na+ao its starting point?

  A ball is thrown downwardkb1 qhm)5 w/ld from the top of a building with an initial speed of 20 m/s. It strikes the ground after 5.6 s. How high is thelh/bw kd)mq5 1 building?

  A ball is thrown straight up with a speed of 30 m/s. (only fillek8gu2;cf-:b rk1vuc in numerical valfvbe : kgr2-;18c uukcue in 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 strhw/+z l szf7jf9y1 ry9aight up into the air with a speed of 48.7 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 6 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 6.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity a2welqtt -p (-nt t = 1.0 s?

  In Fig. below, what is the velocity bj2;ekvg p:b/*lbqs 1at t = 2.5 s?

  In Fig. below, what od1lvd0w t5wbyx -8k :is the velocity at t = 4.0 s?

  In Fig. below, what is the velocity at t2a/ cjx+z0 bdt = 5.5 s?

  In Fig. below, what is the a;b9qhb( . 8m, s;k e nyvhsn5jzkoq/m1verage velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 to 6.0 s?lz1w,q7/v reg

  In Fig. below, what is the acceleration at z my+:p9j(wve1.0 s?

  In Fig. below, what is the accelerati ej6tf:)nrj6l on at 3.0 s?

  In Fig. below, what uoiz1 ,hs9amo2-gn 7his the average acceleration from 0 to 5.0 s?

  In Fig. below, what is thgk.ux*zppv:l .2 2twr e average acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement tasa 38i4plx5 from 0 to 8.0 s?

Does a car speedometh(2 3;i-zx+juafusx; yfj.q rer measure speed, velocity? {speed|velocity}

  An object can have a varying speed if its velocity , f cdj5i-3*mrf7pqc mis constant.

  The velocity of an objectaxj3h0mfd kt95e*2 4z cxx *zocn56a r can be negative when its acceleration is positive.

  If one object has a greater speed than a second object, tbm,wgm;r/+q o he first must have a greater acc;o +q,gmbr/ mweleration.

  Two cars emerge side by side from a tunnel. Car A is travep8m04nnyn*h u zmob9x7e x 2)eling 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 speeqgr;f):yclbibdh4u4 84 kqp +s6qw5md as its acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It leaves t i 6l vy+:p:*uly tv9lgg f0h,oq5-sfnhe bat with a speed oqi*:y9g l-glt6sno:u+f h 0vp 5yf,lvf $120 \; km/h$. 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 accelera ;udxb s ie:- 4b3l:p;wx 6myvk/cg8fation, how does i;y f6 xviwl/ 34;gxe bs c:ump8d:k-bat change if air friction is ignored?

  As a freely falling object speeds up, what is happening to its accelerghsqt5s q8 49a5j)ps xation, how does it change if air friction CAN NOTa5hjgsp)9qt xss85q4 be ignored?

  An object that is thrown vertically upward will return cc(pvz rbhljkns0s b*; 0z7:10 nq.pkto its original position with the same speed as it had initially if airp bq7h0(snnzc0j.z0 c s vbpk:l*k1; r resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzjq:eat z 7,5hw5rp +xnero acceleration at the same time.

  An object can have nonzero velocity and zero accele 7i i+ (9spcq)b*afz2/xfhbl jration at the same time.

  An elevator moving from the secoa)tfshq4sv lj/b rc/a f v.t +0l-w-;rnd floor to the fifth floor making no stops along the way has zero acceleration allftal trc+/-)qb- whvj 4r0s sfa /lv.; the time.

  A rolling ball moves from kov b-dhpp3; 7x.u+6u:nnk6 ol f9vqk$x_1=2.8 \mathrm{~cm}$ to $x_2=-7.9 \mathrm{~cm}$ during the time from $t_1=0.8 \mathrm{~s}$ to $t_2=6.0 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.3 \mathrm{~s}$ is at $x_1=3.2 \mathrm{~cm}$ and at $t_2=3.6 \mathrm{~s}$ is at $x_2=7.5 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter-milrx 16y u5 :;mypapo*o ,z2izyr.hqpz6 e ($1 \; mile = 1609 \; m$) track in a total time of 10.2 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 straight line, movi74 tew6f9aenf ng 94 m away in 11.2 s. It then turns abruptly and ta f4we 7f69engallops halfway back in 4.7 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 y1*2wl( braqj$11 \; m/s$ to $23 \; m/s$ 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 from6 m ms15yp0hny $20 \; m/s$ to rest in a distance of 58 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reachoy:tktom,m m;9:*ny y 0e5fgc a speed 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 sh:n 5ooasy7vl7sx 8(blocks to essentially top speed abouto vo7(l7 58sxh:yss na $10.7 \; m/s$ in the first 14.2 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 spfw1 lk9r34 lsheed of $18 \; m/s$ to rest in 5.56 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid markszg0y72gpp2 s m 92 m long on the highway. Assuming a d20 y2mgp7z gpseceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck gef3 kyttf(m*t; *a4pjoing $25 \; m/s$ 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 -ktja 9n k4)mnrun in less than 30.0 min. After exactly 27.0 min, tn9)j4m -t ankkhere 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?    $s$