Suppose that an object travels from oneqs2jxs0p/o/ yyfk )r+ point in space to another. Make a comparison between the displacem+s)pyx y// kfjo0r2sqent and the distance traveled.

  When is the average velocity of an object equal to the instantan 3 5 12fzuv.al4iapgcu94bvrn , yqw(aeous velocity?

  A new car manufacturer 8,5i4nhtq qm . b/fbcdadvertises that their car can go "from zero to sixty in 8 s". This is a descrip,./b5tbiqm4f dqnh 8c tion of

  An object moving in the +x axis experiences an accelera7pnrk 2tq: 5fmkmt4o:tion of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to thejtls-8tv dqj(76 nz i9 East (+x direction) begins to slow down as it approaches a traffic light. Make a statement conce v-d768(s jqt9 tlnjizrning its acceleration.

  Suppose that a car traveling to the West (-xz ed) (.v/vtub direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleration.bv utd/ (vez).

  Suppose that an object is moving with a constant velocity. Make a staru5 l8i;ksu lw-ckw;p)e y6 m4tement concerning its a;58e ll-suuyk 46iwcmr )wk;pcceleration.

  If the velocity of an object is zero, does it mean that a3j;8o+ie ur uthe acceleration is zero? S+ ;8euij uaor3upport your answer with an example.

  Can an object's velocity change direction w- hck-eh(h1g jhen its acceleration is constant? Su1 kj-eh ghc-h(pport your answer with an example.

  Suppose that an object is moving with constant accelera/+ai1tq )w41 ldce -d(ncdlkgtion. Make a statement concerning its -d kc i(agnq+c1/dd l)1tw4lemotion with respect to time.

  Can an object have increasing l5yrrk:w a** +3oi l.v rf;alispeed while its acceleration is decreasing? Support your answer a;*. lkiwlv5r rol :*ria+yf 3with an example.

  Suppose a can, after an initial km;hjvp)g(c//8 dr i iqick, moves up along a smooth hill of ice. Make a statement concerning its accele)ii8c( gp;v/hm/qj rdration.

  Under what condition iu;ljq iy- a:vyvod9*y83h v y(s average velocity equal to the average of the object's initial andv3-al ivyy :q vuo9y* (jy8;hd final velocity?

  Objects A and B both start at rest. They both accelerate at tpwz.q0sh64 wh he same rate. However, object A accelerates for twice the time as object B. What is the final6h0hq4. wz swp speed of object A compared to that of object B?

  Objects A and B both start from rest. They both accelerate ac.4g pxy o(mw1f6,lzht the same rate. However, objec4p 6,og hfzym lw1.c(xt A accelerates for twice 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 and falls in the absev poe5y8lk a55*abi3 once of friction, which of the followinvyi8*a p3ool5k5 bae5g is true concerning its motion?

  When an object is released from rest and falls in the absence of neu7(4xgr-)s+ e:nunu eu+*u lg vk-mfriction, which of the follmu-u(e +s7n u+vgu:l)ue4rn xg n-*keowing is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the velocity an or3re*8o znd,d the acceleration when the balleo,* nr 38rozd reaches the highest point.

  Suppose a ball is thrown straight up. What is itsa,vjgx :x 5lbcnd6q4j 1uuxu nw c..3+ acceleration just before it reaches its higq 1 xln,cvud3uw.a5 jcg4 n:jux6bx.+hest point?

  Suppose a ball is thrown straight up, reaches a maximum height, then fallkb((mlienpi2u 2 0o5 z.w ps-ls to its initial height. Make a statement about the direction of the e-in wb2k2luomp.i0(ls(5 z pvelocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then fakw5 jl.fsyh5k s:(z6i/.mwx*:r b qmclls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball iisq5 5 l(w.j:xw :fkr. yb/6hcm z*mkss coming down.

  Suppose a ball is thrown downward in the absence of air resistance. Mak b19bv+flaqiokh01 1xe a statement concerning its acceler+k v0hboa xi1qbf11 9lation.

  Suppose a skydiver jumps from a high-flying plane. What is her acceleration whk sd i7a:2(u2jbrc )anen she she reaches krd:(2b 2a7 cijau)nsterminal velocity?

  A ball is thrown vertically upward with arpwx)ilcf e,o3 s(/+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 firsx a wolscf p,i(/r3e+)t ball? (How many times higher does the second ball go than the first ball?)

  Ball A is dropped from the top of a building. Obbj2 g/ 9*o qq3+pvebjne second later, ball B is dropped from the same building.2*+ qqbgvb93/ejjp bo As time progresses, the distance between them

  Ball A is dropped from the top of a building. bzcs khj0tw hbm;r: g*:, 8l.bOne second later, ball B is dropped from 8 .b: *l gj0t:hrmwcbbsz;,hkthe same building. As time progresses, the difference in their speeds

  Two objects are thrown fr+wswf9oq u 1 1ugej4(vom the top of a tall building. One is thrown up, and the other is thrown down, both with the same initial spe4sg1u(wv 1owjqufe 9 +ed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick is thrown str 47 :a2f x:clberfr 1ka-up(giaight down from the same building. They are released at the same time. Neglect ap2r4a1f7: : agu -b(celk rfixir resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zer nyeh. xn lz2k,-2n:gko velocity in the +x axis. The position versus timekz, 2hexn ln: 2kyn-g. graph of this object is

  An object is moving with constantib9-xaz+z. -;bl (lsc o5udff non-zero acceleration in the +x axis. The position versus time graph of thi;-i+.5azlu b dzxfob f(-9clss object is

  An object is moving with;zhud1 f 6iw/a constant non-zero velocity in the +x axis. The velocity versus time d/izf a;6hu1 wgraph of this object is

  An object is moving with constant non-zs.8 98pg8jk,mm/lz7jl zctcchmz t72ero acceleration in the +x axis. The velocity versus time graptzkc9m,t8c 77js8p l. zc/lzm82mhg j h of this object is

  The slope of a position e2vwzajuc735 versus time graph gives

  The slope of a velocity ver9 7jmyvzwn, i(sus time graph gives

  The area under a curve in an acce;4 ly8(t.g fnesqad2 vleration versus time graph gives

  The area under a curve in a veio0a -+n874t oeec fcz:t foi8 ak3ce:locity versus time graph gives

  If the position versus time graph of an object is a horizontal line, th oe 9tm:j4is+z8 c-vdue object o+vz:t ijmc8s -u9 ed4is

  If the position versus time graph of an object is a vertical-m7p6h lkk:i l line, the object isp7lkk: l 6i-mh

  If the velocity versus time graph of an object is7t35w,oslqqv a horizontal line, the object 37 5t,lqovs qwis

  If the velocity versus time graph of an q kx3-wwjyw5 z+.5 xzuobject is a straight line making an angle of 30 degrees with the time axis, the o5 5x.qjw 3uz+z-xykwwbject is

  An object moves 15.0 m north and then 11.0 m south. Find both the dista3ly jc q8,6y3zeb/ewz2i/ goance traveled and the l/g/waioee83 3yzz2yq6j bc, magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long will+w6l*vk,itpjkkw b *) it take to move 12 km upstream in a river flowing 6.0 km)t, *jwk * vwlk+6kipb/h?

  55 mi/h is how many m/s? (1 mi f)*: mf 0p:rrbtexp kp(ssh(7= 1609 m)

  What must be your average speed in order to travel 350 km in 5.gw zhir etub:j.. 3g4715 h?

  A runner ran the marathon (afi ej3tfc 6h:dyg+fo84 3;d wgpproximately 42.0 km) in 2 hours and 57 min. What is the average speed of the runner in m/s34 3;+f:eg6dcgo f8dwt yjhif?

  A car travels 90 km/h. How long does it tnqo;rukh, +r z d-u/1kbazq+6ake for it to travel 400 km?

  A ly (light year) is the distance that light travels in one year. The speed oqtdn9 ;( f dlf5*hux;cf lightd dx5t fu(;q9f *n;chl 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 straigudo s.7*:2vpaat ser: s23p:nib h- thht road and you look to the side for 4.0 s, how far do you travel during this inattpr7hp .2s::sn htua-e:stb *vidoa 23entive period?

  If you run a complete loop a 6uujnxxx6/l i+e. 9qxround an outdoor track (400 m), in 100 s, your average velocity ux/ .6u 6q+xxj9ixel nis

  A polar bear starts at the North Pole. It travels 9p3c;bvkjmgsfc l1r9-zb6*n 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 tzbvgs-n9mj *k91c p6r b3cfl ;akes 45 min. What was the bear's average speed?

  A polar bear starts at the Norfh t.p99m 8 jemz efh2*:h:t;*sdrn ibth 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 poitt b;29j:h.h8epf i*m* rh9: femdns znt. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from school at 55 m;*yzrk o::r4/wq +fspapju2s i/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 homes 4rj z p+:*oqu:kfp;wa sy/r2town from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What isyd l 1,vmsn*)eyt fv72 the average speed of the motorist for the7sf1 2)lmyvv,td* y nis trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. dg9pyxryeh a-s7r2 m+e0f+r . What is her average speed fordg+2e-e0r+shxm.f9y pa7y rr the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mu;+)z8 3 l*rmdu; wudrqtv6y ni/h north for 750 miles. What is the a3ym;;d)vn lu8+qz u*rd6ur twverage speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 100 m) for /,zzc2j vguqz*8dnt / 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 c uz,j tg/n8vz2*qz/d 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 11 s. The 7qaf rdr 2,d;ps, jis2car's average velocity dur7,d; q2ris pdrsfa,j2ing deceleration was 47 km/h. What was the car's deceleration while slowing down?

  An airplane increases itsbs 8dh9u3api8ygp*fgif8ev b1f3 9 a0 speed from 100 m/s to 160 m/s, at the average rate of i83e88 3afi ys d p991ghf*bgfbv0ap u$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h ac/ as z98 ffip).3hi+ybmx*sf ucelerates 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 acccs m965e,bx0tp,wd u. zs v6dkelerates 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 thmwm1 7p-r5 t)x1rdlngen speeds up with a constant acceleration ptdmrmg7nl5 1r )1-wx 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 2.7 m/s experiences a constant accelem -u6ehg2zg w2ration ofu6 -h2w mzeg2g $3.6 \; m/s^2$. What is the cart's displacement during the first 5.3 s of its motion?

  A bullet moving horizontal,4jzpp8yp l3bly to the right (+x direction) with a speed of 304 m/s strikes a sandbag al 4zjyp,p38b pnd penetrates a distance of 12.21 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane 1ef2o,k ljyl 8cj0nfx5lr 2l0is launched from a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2n5 l8yr llj2x1 ckefl02jf,0 o.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with constant acceler ylr j4y0lpz3,ation 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 its aver3t a5/l vaoas sby1a-)age acceleras/aa t1boay5 )v3ls-ation?

  An object starts from rest and undl15l8nc5doeyp; 7b;l ,jovwj -x 8xzkergoes uniform acceleration. During the first second it travelz7o;l-lk,xjw1dyo vxln8c5e ; b5pj8s 4.9 m. How far will it travel during the third second?

  An object is moving in a straight lindbf+untt; * (oik8 *wee with 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 timbu;(t*+ief8otn*w dke?

  A car starts from rest oai p6s4s7sqf4w q() wand 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 decel-vzbuv.rwtb25c*r;3yfz2 9pel5 tg perate 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 waiting at the gxsche ( ud-99l2 ;nwhtqn+ k.intersection starts ahead with a constatnsw h9-9 x 2ekl ;chqu(.+ndgnt 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 wrr+dy.qo( : e21f oi0qfv4rh0pj0run ith a speed of 12 m/s on the surface of planet X where the acceleifur00+pv( qrn h.ord :yq f40jor12eration 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 sb xgv8f baa-y;i6h2:qurface of planet X where the acceler6i b qba hgyv-fx:;a28ation 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 surf8 (amgndao7 uw90*xkcace of planet X where the acceleration due dng*c8 o(x07am9w kua 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 zc5/pp v*h 8/0fulquw of 14 m/s on the surface of planet X where the accelerati* pw 8uphv5quf/0c/z lon 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 f,we*hx q9jkx z pv7bz-zy93 r+riend holds a ruler between your finghwx ejvz 9p9yzb7+* z -3krqx,ers and releases 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. What if)ojikk..8r ps its velocity after 3.0)kpi .8kjr.of0 s?

  A bullet shot straight up returns to f03xdj-qp-h6bb jnd.;i(vp) 1syq is its starting point in 16 s. What is the initial speed of the bull xd0i-isj)y q6phf1 . 3nb s(q-;vdjpbet?

  A ball is thrown strai;xu51yy vot- eght up with a speed of 36.0 m/s. How long does it take to return to its starting pointoy t51e uv-xy;?

  A ball is thrown downward from the top of a building with an i/sfvj 0edtud*e: e 1;gnitial speed of 6 m/s. It strikes the ground after 6.7 s. H 0v:*1deg ;sjtue/fedow high is the building?

  A ball is thrown straight up with a speed of 3c7 qu nwgh:h()0 m/s. (only fill in numerical value in the blanks)7gchh: u()wnq
(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 st6g3vky q, /sbfkpgi+ eg)1d e3raight up into the air with a speed of 22.4 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 7 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 7.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity a k)qy f6hc.zuu -twipc;+ *ow.t t = 1.0 s?

  In Fig. below, what is the velocitrkfx+glw(ac nojnj: nk h y. ;3b*-5(wy at t = 2.5 s?

  In Fig. below, what is the velocity at t = 4.0 ipmksy3e 6o7. s?

  In Fig. below, what is the 34)wqf,qfcfnvelocity at t = 5.5 s?

  In Fig. below, what is the average velocity from 0 to 4y k+cq61j+dfdf p,7m ax+y, gvk(h sx(.0 s?

  In Fig. below, what is the.h7+x k1 efs66q,hnx77sswir l6m qev average velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration at 1.*m o :/uu4hui53fwnoh0 s?

  In Fig. below, what is the acceleration at 3.0 -uef17;g i/p;+nj3 cknkyt s bs?

  In Fig. below, what is the average acceleration from 0 toby)p 9; t:agkt 5.0 s?

  In Fig. below, what is the average acc4 mpsuje6 ,0u-yw+l ybeleration from 0 to 8.0 s?

  In Fig. below, what is the displ6* u/w+khzfs-r)xlxr acement from 0 to 8.0 s?

Does a car speedometer measure speed, velocrhm -m- l6v umg1and73ity? {speed|velocity}

  An object can have a varying speed if its veloc uxo(-osr9xg mf3+wj.upp .- dity is constant.

  The velocity of an object can be negative when its acceleration 58-jdsgyx,zflv qa :8w)t 1fb is positive.

  If one object has a greater speed than a second object, the firs2kcb*x q- ctsg05ll v-t must have a greater acceqtg*vclc xkl 0s5--b2leration.

  Two cars emerge side by side from a tun-n+,u5h bhkwxnel. 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 incrnvz4, * o*pj.n*j jlcleasing in speed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the air. Iti r 3 lu/zr(r7lx s5tkiyy)9g* leaves the bat with a s rr)g(lk9x/ 3 ly5t7ir*yiszu peed 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 shd /yabk-(t7is happening to its acceleration, how does it change i syhb(7td-k/a f air friction is ignored?

  As a freely falling object speeds up, what is happening to i4yv1v0g.kg pml;hqb/ 9) 4du unq;pyfts acceleration, how does it 094 pd/y4fp;bqlq1 ;ky.gugvu )n mv hchange if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its original positionvg ptw4zfc8(x kf*-2d with t4*8vpzf wf 2gt- (kcxdhe same 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 ated4zsy z sk.1.b27uq cceleration at the same time.

  An object can have nonzero velocity and zero6xc0fo c tn enih2t6h74*qe6t acceleration at the same time.

  An elevator moving from the second floor to the fi7;wyrs0 knvj y:g8u:l41v hhzfth floor making no stops along the way has zero acceleratio::sl8 uyh 7vgjkr;wzh 0yv1n4n all the time.

  A rolling ball moves fromcvzm656zds/l u0c w/w;+pp yz $x_1=2.3 \mathrm{~cm}$ to $x_2=-8.2 \mathrm{~cm}$ during the time from $t_1=2.7 \mathrm{~s}$ to $t_2=5.7 \mathrm{~s}$. 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 $x_1=3.2 \mathrm{~cm}$ and at $t_2=3.4 \mathrm{~s}$ is at $x_2=8.2 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter-mile rlpfn4)i/aypp x7 l)r6; yv8 d($1 \; mile = 1609 \; m$) track in a total time of 10.5 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 straight line,-q/su97krhk y moving 105 m away in 13.7 s. It then turns abruptly and gallh rk7-/9 ysuqkops halfway 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 fro5up;jvs2sx bh 4c;p 8qm $12 \; m/s$ to $25 \; m/s$ in 5.1 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 fromf+t5) us girxe. fb43l $22 \; m/s$ to rest in a distance of 75 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed ofgn 1rh+3f7w p ,sc1des $26 \; m/s$ 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 essentially top spb0mt-x te sr:pxq a3pii2:(w3 eed aboutpt3r xea30p- t: q:(mixs b2iw $10.0 \; m/s$ in the first 14.1 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 spe8q42s ldg;wrqi-l 40gd+s x qwed of $19 \; m/s$ to rest in 5.17 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 highway/x s;i4mjxnlw.1 z6f p. Assuming a deceleration offn sx;i/j1 plm.w4z x6 $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck um1i 17aoc ctc1wso c ,ry(2f5going $25 \; m/s$ 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-yu0-x1 ;:wj njgk ufv 10,000-m run in less than 30.0 min. After exactly 27.0 min, there ar:j unfwv0-y ;gx-kju1 e 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?    $s$