Suppose that an object travels fr2os)luhs itp;64 w2p ucp*.jyom one point in space to another. Make a comparison between the displacement and the dw2i*2.stp 6p 4plju c;y u)oshistance traveled.

  When is the average velocityr* 67e w1khz7 wnzxfx- of an object equal to the instantaneous velocity?

  A new car manufacturer advertises that their car cqxkx2.1 d4b:sw+ob ct an go "from zero to sixty in 8 s". This is a de:c1.2t q b+dsxw4kxbo scription of

  An object moving in the +x axis experiences an al6kgk20 lp* :lg txdf(cceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to s+m/i 4 kbfyfg: f 0/.g*ixrhullow down as it approaches a traffic light. Make a stat xhgil*mi urb4:+fgf/y. fk/ 0ement concerning its acceleration.

  Suppose that a car traveling to the Wesr b 7fihi/uvjf*c(b +7t (-x direction) begins to slow down as it approaches a traffic light. Make arv 7hc( fuf+*i/7bijb statement concerning its acceleration.

  Suppose that an object is m,lksy6 m.fl5 xoving with a constant velocity. Make a statement concerning its asm 5l6y fxl,.kcceleration.

  If the velocity of an object is zero, does it mean that the accelera;iraw -hp+o .ltion is zero? Support your answo+;l ar. i-wpher with an example.

  Can an object's velocity change direction when its acceleration is constant? xy vc 3m8-edsu.;yu+avg0 v5s Support your answer widy3-8y vg sm+.c vusxa; u0ev5th an example.

  Suppose that an object is moving with constant acceleration. Mu)h7 jbqvzg y(32 rnz7ake a statement concerning its motion with renub2g qy3 7zh)rv7j(zspect to time.

  Can an object have increasing speed while its ac7 564x olbqejq* trku0 lelc+)celeration is decreasing? Support your answer with an exampl xo eetr4lc57ubqj+0l6* )kqle.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice vf+a yp03ldrh.k zl(ko4t,d1 . Make a statement concerning its accelevdf(kd l z lat r1p3,o.kh+y40ration.

  Under what condition is average velocity equal to the average of the object')9 )d0:ks uy;iex2cg myimi-t /ztk9 5v(deca s initial and final velomidxk g k:ey 9 v0mc)d;2iuz(e95ttis)y/c-a city?

  Objects A and B both start at rest. They both accelerate at the same rat fuh+nba;8,kfe. However, object A accelerates for twice the time as object B. What is the final speed of object A compa;fb un k,a+fh8red to that of object B?

  Objects A and B both start from rest. Theqao9 mi xuqjv+6jkvtxcf7s*p76e:- 5 y both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance travelj9 ui v vqop66 *xce+-t7sx57mkqj f:aed by object A compared to that of object B?

  When an object is released from rest and falls in the absence of frictio khuvcs ty6v+o.16m r;n, which of the following is true concerning its mrv o.k6 mv cuh61;ys+totion?

  When an object is ren)bjd je8d8t w7m 2w3n5ch r.qleased from rest and falls in the absence of friction, which of the following is true concerning5qn8c8j3.h wewm 27) dnr jbtd its motion?

  Suppose a ball is thrown straight up. Make a statement about the velocity and z9 rih2jz0 b/j8p4mrfthe acceleration when the ball reaches the highest 420r/mzjfizhrp 89jbpoint.

  Suppose a ball is thrown straight up. What is iticer6jixa 4gm5-n 6h1s acceleration just before it reaches its highesc5j6ii xrmn1 64ga-eh t point?

  Suppose a ball is thrown straight up, reaches a maximum height, s- gpx 13+6zdt8qe xvdthen falls to its initial height. Make a statement about the directi6zxte1qsgd-d 3p 8xv +on of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls to h 2lo2xw- 8ija-p tae+a9 m1xmits initial height. Make a statement about the dirmm2--ea1ia9 a w+8 xjx2plothection of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown do* b0*wr lj(uj)6aqo kdwnward in the absence of air resistance. Make a state)0j r*k6o ab*dj(wlqument concerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane.sy/0s kf7.q8y.g u6i+qvjd oo What is her acceleration when she she reaches termi8yg + 7ois k0jy6oqqf/ ds..vunal velocity?

  A ball is thrown vertically upward with a speed vub32 3f bx,xejl:e:sn. 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 ballex 32 b:lx nsjbeu3f:, go than the first ball?)

  Ball A is dropped from the top of a building. Oyw qp.7- gvs5*z p)ljmne second later, ball B is dropped from the same b)m5 q l7zv ws*pp-jgy.uilding. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One second latme d7(vokwz vn53s/f1 er, ball B is dropped from the same buiwk(s/v1z 5nef dv7mo3lding. As time progresses, the difference in their speeds

  Two objects are thrown fro)3*oved;t go vm the top of a tall building. One is thrown up, and the other is thrown down, both wit;3o) *vtogdv eh the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from thek;h+so8hs (wx top of a building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the s+skwh8 (oh ;xaccelerations of the two bricks.

  An object is moving with constant non-zero veloc)7,lxf 0zja0 qw sqcg1ity in the +x axis. The position versus time graph of this object lfxg q0aws c17 ,0jzq)is

  An object is moving w(z45wq- wr *,oso-acvla 6 qylith constant non-zero acceleration in the +x axis. The position versl*l,4a rsvca ( oww zyqo5q--6us time graph of this object is

  An object is moving with constant non-zero velocity in the +x axisx4s8 wt.we*jk qrb:um :)fk:q . The velocity versus time graph of this :j8k)qetf4s kw*mx w b:.:q ruobject is

  An object is moving with constant non-zero acceleration in the +x0x,ur k.lkn)r axis. The velocity versus time graph of this objec,r0u nlkxr). kt is

  The slope of a position versus time graph gi:59osa0 ilk :c hx*u1xpohi5 ou 32yoaves

  The slope of a velocity ve/1 .yyx jz (5 q7rxkr;fg0ymwp+ hyx5orsus time graph gives

  The area under a curve in an acceleratioh gof +i 7wpi8b:abu3*n versus time graph gives

  The area under a curve in a velocity versus time grt(iyhc 0dpf2fv:0- ybaph gives

  If the position versus time graph of an object is a horizontal line, thh gg9l)u ilm76e object g i)mh679u lglis

  If the position versus time graph of an object is a vertical line, th7nh:z;yb;e5ccen :d v p5fp, de object isnpcefd n5 vb;:p7c :5 dz;,ehy

  If the velocity versus time graph of an object is a horizontal li. 1, pz3me3iz ms4gegwne, the object i 13e m4pmz3.sz iggw,es

  If the velocity versus ti5; jgu)td cwb/q+cl3 dme graph of an object is a straight line making an angle of 30 degrees with the ti3b+d)5tcucjdg;q/ wl me axis, the object is

  An object moves 15.0 m north and the/*nxt pq r8wk2n 11.0 m south. Find both the distance traveled w r8tx*k npq/2and the magnitude of the displacement vector.

  A boat can move at 30 km/h in stiu l7tvzk5(q)g)9 n; rr ig/qaill water. How long will it take to move 12 km upstream in a river flowing 6trvn)9z/;7ig )q(ui gq5lk a r.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609pi/wwma.+9 eeu0+/xft l fpa ( m)

  What must be your average speed in order to travel 350 km in;tz5 zhk9ez+nh /x 3ii 5.15 h?

  A runner ran the marathon (ap 3qh;pn ffqu+9proximately 42.0 km) in 2 hours and 57 min. What is the +qu3fqn p9;fhaverage speed of the runner in m/s?

  A car travels 90 km/h. How tgx3g :nx8k3a bfhd6:long does it take for it to travel 400 km?

  A ly (light year) is the distance that light travels in one year. Tljr;( tgb qe(1he speed of light istreqg; bl(j(1 $3.00 \times 10^8 \; m/s$. 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 r,dp7)tm y- lh:zj(7p7yj3p eufy*og eoad and you look to the side for 4.0 s, how far do you tra)7gemfyo- , hl*(j:zpup 77p yy tjed3vel during this inattentive period?

  If you run a complete loop around an h3vane/ qg4m( outdoor track (400 m), in 100 s, your averag4nqamve/3hg( e velocity is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km v kt,kzj/3 9nn l::xsjeast, 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 average speedj9vkx/ snjk:lz3t , n:?

  A polar bear starts at the North Pole. It travels 1.* +fgv-8g fmtu lg,x ax-w-e1tudd+ 3v0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km westud+ xef1 gg x-gtvu+3 v*flwtm-d -,a8 to return to its starting point. This 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;1odqy99dm8m29b4plx jq w sc 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 hometowc92q sxjdw99 d84o ;m lm1bpqyn from school?

  A motorist travels 160 km at 80 km*x/7 vu+we 5v1 nqyoyn/h and 160 km at 100 km/h. What is the average speed of the motorist for this txvnew*vqou7/1 +y5n y rip?

  A motorist travels fo+ji svbklu.)tn 1c27x r 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her average speed for thes1c+j)itn ux2.l 7 kbv trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h north f -6j 9clmrcunqnir 4d6cr3v( s3m( t(vor 750 miles. What is tmccir tm 49nv6rq6(sldc- r3v(nu( 3jhe average speed for the trip?

  In a 400-m relay race thekp9jz n*j+6c /+ /sdpdebaki- anchorman (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 /jzs6pa dp*bck9+/jike -+dn 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 tmjj68 whgzlhshd7t fcq 162-dl)mf(( dg s::mo a stop after 13 s. The car's average velocity during deceleration was 77 lw6gd6chsm2-dg( d lt7 zsj fhm::1q (m )fhj8km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s j nd,7gec )wb/to 160 m/s, at the average rate of )b jegndwc/ ,7$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h acceleratesgo/:) lzbtm lm+8n,wv 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 acces9kt 1 :0*pra nuie1tso9oss)lerates 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. ug 8; fjy+ 9gr*du564 uhcjqcd It then speeds up with a constant acceleration 9u jjc +rd quyfg; g4u8*hd5c6of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 6.6 m/s experiences a constankfsav047z 2 fet acceleration of sz04evf kf7a2$3.2 \; m/s^2$. What is the cart's displacement during the first 7.1 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed of 4877/kz4u c 049xhn(pbaq sgkz-o 87dyrb m/s strikes a sandbag and penetrates a distance of 55.kx74(4u 7p/z098 bodc zs- rknqgbyh a64 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on adqz9yvuf:cub-455g) b mpz w 6 ,er-lkn aircraft carrier. It reaches a)r69--u zy4kqfpwz bgm lvb5:ue,dc 5 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 length of the catapult?

  A car starting from rest moves with constant accelef u54c ,)sii:wl+b s;ez0j)/rl llerj ration 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 n7bo7ngync .y7o2t4 eits average acc7enbyg2 oo47tn .n y7celeration?

  An object starts from rest and undergoes uniform acceleratizh*h8a +altg2 z 8l;dq.tsm 5ion. During the first second it tra dtlq;z z+mh5*a.t88 glahs 2ivels 1.0 m. How far will it travel during the third second?

  An object is moving in a straight line with con5v19mfx kc,p mstant acceleration. Initially it is traveling at 16 m/s. Three seconds later mkm1 p,9vfc x5it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates uniformly at b et)65g)61hykwaye r$3.0 \; m/s^2$. 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 a ;: -,hiobmr;cgbg bj/bout $5.0 \; m/s^2$ 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 gwhp2:w4ps/h*rcu 0 el3z 6/; dg.jg2p wiwir intersection starts ahead with a constant acceler/ w s w;z6p:ijp2wh2 d/3hge.l*w4ugip 0c rgration 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 spe7j0k a-xp;16ydwzl:dc st v,/wum; d ved of 12 m/s on the surface of planet X where the acceleration due to gravi dvum6yc:,0vl-ws d;;x7 t1kzd/pwajty is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with jc tymer++7 +ueofhy2xo+1:h w2cu ,ba speed of 12 m/s on the surface of planet X where the acceleratix uec,ymj +7f2y1tu+:e hc owb o++2hron 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 surface of 5g +8fxye okrreu1;+r planet X where the accelera+ 1oef8xe urkgyr;+5rtion 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 surfacce6dqvf, iv(*l qua mu4o(:d 4e of planet X where the acceleration due to gravityd: * i(e4(vc 64uqqvauof,mld 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 3q ok.zm eie09 lf tl*(01maknyour friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall before m3 .tfka *mi1qzlo00ln 9(eek you catch it?

  A ball is thrown upward at a v;g zcy6 ulf0y8nb (u5nelocity of 19.6 m/s. What is its velocity after 3.00 s68n (fuc; bgz5y0 lnuy?

  A bullet shot straight up returns to its starting point inbzkczhc / r)65qvzl3hh6 a6h6 18 s. What is the initial speed of the bull3 6ck lzhr)hcbhvzq/6zh 6 56aet?

  A ball is thrown straight up with a speed of 36.0 m/seiwy ,+xqf oq)ry7 8c). How long does it take to return to its staxw)qe,+r8yc7 y)q f iorting point?

  A ball is thrown downward from the top of a building with an initial speed;y 4 vtyexn5 ,i*qbl6e of 11 m/s. It striktx*e 5 yenq lviy;b,46es the ground after 2.9 s. How high is the building?

  A ball is thrown straw.0f r+l k j3mphtsd/k/g)jx4ight up with a speed of 30 m/s. (only fill in numerical value/kls j0r+ j/fx)3.d4ghkmwt p 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 straight up into the air with a speed of k/q9vg+a:3kvi*am gb 21.6 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 15 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 15.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what iswv4iu h sl6 pd7*q.,rc the velocity at t = 1.0 s?

  In Fig. below, what is the(,9fp v,cvb 8; aura+zcw *ffi velocity at t = 2.5 s?

  In Fig. below, what is the velocityvh( rh72pv mof1*y0qy,csv 5h at t = 4.0 s?

  In Fig. below, what is the nle c5x (7et5tvelocity at t = 5.5 s?

  In Fig. below, what is the average vk fysw(++w t)np)yh s9 21d: eqzxq(iuelocity from 0 to 4.0 s?

  In Fig. below, what is the averag3)3e(ss s hrlke velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration at 1.0;/tsl y0t t4)zq:w lfcw8p+ wn s?

  In Fig. below, what idi 46/l ujpyu6yj6ap i+y5 e3dw .7vyss the acceleration at 3.0 s?

  In Fig. below, what is the average acceleration from 0ruire,u g+q,0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 to 8.0 wbr)e31z-e/g hhr hx0 s?

  In Fig. below, what is the displacement from 0 tot33 65zp .mpep6rnicbyzv m kg;:f3i * 8.0 s?

Does a car speedometer measure speed, velocit/jnsw4mt8 r( by? {speed|velocity}

  An object can have a varying speed if its veloci2o0w,wn0j n bthisw0 -ty is constant.

  The velocity of an object can be negative when its-uk,ga6u 4 iam acceleration is positive.

  If one object has a greater speed than a second object, the first muso-t co.*yl0 obt have a greater acceleratio*t bo0-yl .ocon.

  Two cars emerge side by side from a tunnel.m4(uxmnndpxb h0n5y c 55-dk9tr5(wy 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 accelerati3a:3usyx cj4uikx s5yjfd:1ki( 7a;don decreases.

  A baseball player hits a foul 7 *a/ut+vyqiu ball straight up into the air. It leaves the bat wy+*/t v 7quauiith a speed 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 ha g ,z5m4-vroe4 h3qxvvppening to its acceleration, how does it chan5z,x-4 vh vrq34evgomge if air friction is ignored?

  As a freely falling object speeds up, what is happeni 2flbct6 cd4im0-d yoc3)t 3pbng to its acceleration, how does it change if air friction CAN NOTy p2o03ci-)bcm ftdl6tdb 43 c be ignored?

  An object that is thrown vertically u9 za68u/ minjlpward will return to its original position with the same speed as it had initially if air resistance uj869lim/a nz is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration at thau-z0vh q rnazvbb3onm, 813 5e same time.

  An object can have nonzero velocity and zero acceleration atz(dho7mwg1uvq)6nuv/)e) r j the same time.

  An elevator moving f pei- job0sfq60 u+bp wy+)w,urom the second floor to the fifth floor making no stops along the waybbuw0q6i+ofyw)pp es -+ u j,0 has zero acceleration all the time.

  A rolling ball moves frcvp ,;whocls90 k m6a)+ddu.d9 c2atgom $x_1=3.1 \mathrm{~cm}$ to $x_2=-8.5 \mathrm{~cm}$ during the time from $t_1=1.5 \mathrm{~s}$ to $t_2=5.3 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.8 \mathrm{~s}$ is at $x_1=2.9 \mathrm{~cm}$ and at $t_2=3.6 \mathrm{~s}$ 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 drervq38d3 6yb/ owkhg) y96 n($1 \; mile = 1609 \; m$) track in a total time of 8.7 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, moving 88 m lwrvse g3o9( 8away in 10.7 s. It then turns abruptly and gallops halfway back in 4.6 s. Calculate (a) its average speedo r8 3(s9wvgle  (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 d 0gc9l4g xhp3neizfgx 9: + 4ny .5ediqkp.b0$12 \; m/s$ to $25 \; m/s$ in 6.0 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 froci 0q,ditn 26laggpro*pw t/n5,/ +mrm $22 \; m/s$ to rest in a distance of 83 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed731 ujcbw1asp of $29 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.3 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blockz6f 7t pnr41pys to essentially top speed abou6p1fnrt p zy47t $10.1 \; m/s$ in the first 13.7 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 uniformly from a spse8t:v*hr0x cd. l.fzeed of $17 \; m/s$ 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 marks 92 m long on the highway. Assu)+gldd i7q.nq w/iuq 6ming a decel wdq 6n+iil/udq)7.gqeration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a trup+ndldaogb 66 x-49nock 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 than 30.0 min. After exactdk*qc je 0 mnt1ab50ce,z:z9h ly 27na cedc:*9qtz0hebjm0k z51 , .0 min, 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?    $s$