Suppose that an object travlb;p qq.8/c pbi:2zdwcg q-(cels from one point in space to another. Make a compagd: -qc l;pzp28cqq.i/w( bcbrison between the displacement and the distance traveled.

  When is the average velocity of an objec0bpa+xc. q ) r zwcf8j+d(8ojct equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can *)/u/cjlrq ntgo "from zero to sixty in 8 nutc)*/rjl/ qs". This is a description of

  An object moving in the +x axis experiences an6dex3 :pkz4m1nl lo);f- we ml acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to tho-4q0jfxez6i7z w md9e East (+x direction) begins to slow down as it approachesje6f ox-9 w7mizqzd04 a traffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) ud3c1ng,z18 wv1lyxjt; 3 aefbegins to slow down as it approaches a traffic light. Make a statement concerning its accelerat 8;cf3e gty11d,jwl1uv3xna zion.

  Suppose that an objecf(c6mp+)m;gmp)7 * h zkr bkjgt is moving with a constant velocity. Make a statement conc z;c7(mg)br khmmj)p pg*f+6kerning its acceleration.

  If the velocity of an obje ajgbzs+bcf( 2n2t3)nct is zero, does it mean that the acceleration is zero? Support your answer with an s+22bbgfc t () an3jnzexample.

  Can an object's velocity change direction when its acceleration is constanktj hiu -)qi07t? Support youjhik7u)t iq-0r answer with an example.

  Suppose that an object is moving with constant acceleration7 8nwbr3 vf+ym. Make a statement concerning m vy7f3n+ wbr8its motion with respect to time.

  Can an object have increasing speed while its sk9(vc3r; ioeacceleration is decreasing? Supporcv is( kre9;o3t your answer with an example.

  Suppose a can, after an initial kick, moves u1 a:w*qohei .jp along a smooth hill of ice. Make a statement concerning its acceleaw:jheq*1i .oration.

  Under what condition is average velocity equal to the average of the object's ,4cx 7e brjv1dinitial r1bx4dj evc7, and final velocity?

  Objects A and B both start at rest. They both accelerate at the same rate.ma-1r(237;c xnt 3 wttf c*f4qgze*kezv.gwg However, object A accelerates for twice the time as object B. What is the final speed of object A c; 7g z*2.1g3t*egtqcfca3wm 4n xfwktev(z-r ompared to that of object B?

  Objects A and B both su lh5tn*cvgg65 7i; oz b;wt.dw9 jb5ttart from rest. 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 compared to that 9bltt o.5itnh;;cg dgvb wwz*7 565juof object B?

  When an object is released from rest and falls in the absence of friction, whipn8x/xt9 ; u4tv nhei+ch of the following is trui9h t8tn/x p;u+en4xve concerning its motion?

  When an object is released from rest and fc; fil*k-7be mzzs ouv(4 ,tk9alls in the absence of friction, which of the following is true conceiu z;7 cz4*-smko ktl, (fe9bvrning its motion?

  Suppose a ball is thrown straight up. Make a statement about bzz2mj-(j vp 9the velocity and the accelera-mzp 9jj2( bzvtion when the ball reaches the highest point.

  Suppose a ball is thrown stoyuh::8j e 03g68 zxdz vxd,p nt4ro7rraight up. What is its acceleration just before it reaches its h e43g8zyr8,0rdvo7 x:zn phoux : 6tdjighest point?

  Suppose a ball is thrown straight up,gz; (odrae- d6wt4:cr reaches a maximum height, then falls to its initial height. Make a statement about the direc-d4oc :er zg;rwa6t(dtion of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a m r;t pu jfh9s.i3e:3bfaximum height, then falls to its initial height. Make asf;ru3.ph9b: 3fe ti j statement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward )kp:b t4wn5k na.-x kcin the absence of air resistance. Make a statement concerning its a:.tkn)b nk5 pc4kw-xacceleration.

  Suppose a skydiver jumps from a high-fau, ,k hcx+1)3iu tap0fme)fklying plane. What is her acceleration when she she refhm)i3u,a e kck)0uax1t f+p,aches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical second bat l:o4 8c-qlga8be)zu zqdsfs90 -5uq ll is thrown upward with a speed 2v (q)clq5z sda : o-8luu0b8z -e9gqstf4twice 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 thea lm2iq4z -y2i top of a building. One second later, ball B is dropped from the same b2y2iqm a -i4zluilding. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One second lg xp:.4 u/gnp+zq2w joater, ball B is dropped from the same building. As time progresses, the difference in their z 4.:nq+gpx gouw/p 2jspeeds

  Two objects are thrown from the top of a tall building. One is thrown u 3qeg n0hb (5;nws)9xfoo2bt-gy4ym t p, and the other is thrown down, both with the same initg5txf9o)(t s;beoy23 y4q0- nn hmwbg ial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick is thrown (wrwub w b;:9b5jkd.astraight down from the same building. They are releaseu. b d9 bwwwb(a5k;j:rd at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axisz5 conc5fu)y++jn y5g. The position versus time graph of this object 5+cjyo+ )ncn5 gy5zuf is

  An object is moving with constq6srj sp)4o3i.zqjt/i- a3 rj ant non-zero acceleration in the +x axis. The position versus time graph of tz o6.4-33rp/qqajijs t jr)ishis object is

  An object is moving with constant non-zero velocity inng x.aa((pf7 r the +x axis. The velocity versus time graph of thisf(g7n( xp.aar object is

  An object is moving with constant non-zero acceleration in the +x axx em0 xl-7z7q,bo(dmlis. The velocity versus time graphmbxq 7xlzo -(, dl07me of this object is

  The slope of a positqjwnl; 3jd/4ki6 ,kfyion versus time graph gives

  The slope of a velocity ver(0wv*,de k -xxfvpg wfzz4*, tsus time graph gives

  The area under a curve in an acceleration versus tim;;rhxomf4 d 6, .acz j0stuxa,e graph gives

  The area under a curve in a velocity versus time graph gig2 j(sfik1e o+ves

  If the position versus timel4a(kpa6s5b cqge cw713p y7o graph of an object is a horizontal line, the object pygklqcep(1ab37 6sw5c7o a 4 is

  If the position versus time graph of an object is a vertical line, tf oe)do /+1nmthe object is+ )mofne1od /t

  If the velocity versus time graph of an objexd d,iq a ,e1z4f0+idsct is a horizontal line, the object is eqs,+ ifd1idx4zd0a,

  If the velocity versus time graph of ureji+n lq4,tum s*5, an object is a straight line making an angle of 30 degrees with the , 54ltu umrine*,j+sqtime axis, the object is

  An object moves 15.0 m north and thzyjc 0b/j;k-erez,hj49 ( kxsen 11.0 m south. Find both the distance traveled and the magnitude of the de4(kcy0bz9jxe ;- ,r /jk szjhisplacement vector.

  A boat can move at 30 kg. 0 4mw.k u/.ubjcfotm/h in still water. How long will it take to move 12 km upstrm.w kg u.j0/cuofbt4. eam in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609 a m*yfvu2n6m.znlh7tz 9 v c+0m)

  What must be your average speed in order to travel 350 km in 5.1r,r)m ymb24j k5 h?

  A runner ran the marathon (approximately 2dmt(vw. m8g n42.0 km) in 2 hours and 57 min. What is the average speed of the runner i2.mg dt v8wnm(n m/s?

  A car travels 90 km/h. How long does it taket,uawj1x5 r/ai :+id5/2: t5 lwfiadursmbl5 for it to travel 400 km?

  A ly (light year) is the distance that light travels in t/ 6 rh:k, )cgfwit5ixone year. The speed of light iwi6f:/ 5igcx ,t )hktrs $3.00 \times 10^8 \; m/s$. 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 andneb,l;br+ +w(hf ydh.x 6*qoh you look to the side for 4.0 s, how far do you travel durin +,b (fxlyh+qh. 6*owbr ;nhdeg this inattentive period?

  If you run a complete loop around an outdoor vw39r3asy4hj/)qx qo track (400 m), in 100 s, your averaqr3y/v 39x4q waoj )shge velocity is

  A polar bear starts at the North Pole. It travels 1 njh x9(mw;lt+.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. Wh njt;l 9wh(xm+at was the bear's average speed?

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 wqf,:+x( kng nkm 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 nfxgw:+k n ,q(average velocity?

  You are driving home on a weekend from school at 55 b 2f- qs3fgo ::i(zq:s+x:n uqt xgtj;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 yo(u f:-::g i;3sgjnqq t:+xqo x z2bstfur hometown from school?

  A motorist travels 16v( v*uorsbojk (3d.jzz89 9qo 0 km at 80 km/h and 160 km at 100 km/h. What is the average speed of the moksov3.zoz8b u( 99jjo (rdqv*torist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 he-9ke;b g kfw4 at 100 km/h. What is her averk9 k;bfeg-4weage speed for the trip?

  An airplane travels at 30j+1hx, x+nt zn0 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. What is the average 1x t j,+xh+nnzspeed for the trip?

  In a 400-m relay race the anchorman (the person who runs the la: t4 g0wc.jpcbf+ j3q/hck;hest 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 thec 3kwbc4h;. j:hj0cegpt +q/f team A runner not lose the race?

  A car decelerates uniformly and comes to a stop after5 1o p:5ialjcgwo/;w o4swvyba 7 n+g+ 11 s. The car's average velocity during dec i7/+wogwyp1w4ns lgo+j a a;b o5:cv5eleration was 68 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 thexx0ds;h r/ v(y average rate of hx0rvs(; dx/y$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rate of*0 z(rmhcc s s;h2 uicc4uq0;k $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from rest and awce ej 8r0j mhknz+c262,u oyw-hh.j,ccelerates 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 th xdhxe2- z*l0pen speeds up with a constant acceleration of0l*eh dx2 -pxz $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 2.7 m/s exc.dv6q+ ,vv grperiences a constant acceleration o+ rv6,d vqcgv.f $4.6 \; m/s^2$. What is the cart's displacement during the first 8.9 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed of 269 m/uwcp**-us 8m os strikes a sandbag and*m*uc s8 wuop- penetrates a distance of 71.99 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. rw ol/t4nu)b oqu/ d-ii5;i+u, 2v lnrIt reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is constanu l vuronwl ub-i/ot,)q+r;4nd/ 25iit, what is the length of the catapult?

  A car starting from rest moves wituvp3 9ov4s :-uykpma(h 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 h e,kvuratv x-6(-f5w2qtmri4 n7zk :in a distance of 200 m. What is its average acct-kqe4u2,6:kxv nav zwr7 rm-5 fh ti(eleration?

  An object starts from rest and undergoes uniform acceleration. During the fic a4u6n*dv4 njrst second it travels 5.9 m. How far will it tnv*a4d6 unjc4 ravel during the third second?

  An object is moving in a straight line with cons et1kxw; :nc+ x+bcff4tant 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 4+ ex1cc:wkft;x b +nfthis time?

  A car starts from rest anzndw( : xv7)pnd 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 decx( i*c(l bs1cwe1y; g nm.jb)pelerate 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 trafffic0cqe.hcy ,l oy)h:r8xw alz(.7 .jz8*h b dic light turns green, a car that has been waiting at the intersection starts ahea (jc*flie y). .wr0z,cyol: 8b7h8qcah.zdh xd 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 1.ip 1 qk(;ifeq2 m/s on the surface of planet X where the acceleratpieqq. ;k1(ifion 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 surf+wkppqk *y*un54i soi7:j yubh 1st4(ace of planet X where the acceleration due to gn51 hyos7su:p ju(*b*tiy+pwk 4 q4kiravity 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 plav /rqnk . ,)b2cfu7nxynet X where the acceleration due to gravity isckn.f/, nvxy 2brq7u) $2.5 \; m/s^2$. How long does it take for the object to return to where it is thrown?

  An object is thrown upward with a speed*vp/lcp8j,vksv9ss pqfo 5:0 of 14 m/s on the surface of planet X where the acceleration due to gravitysl5 p 0*sp : jp/oqs9kvfv8v,c is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greater than j yxnsqck49gc*a: ;l:0.10 s. If your friend holds a ruler between your fingers and releaxnk* yjl: cg;cs 49aq:ses it without warning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upwar bw6h3ho dsi(*md(e (jd at a velocity of 19.6 m/s. What is its velocity after 3.00mejwbsi(h *hdd(3 o(6 s?

  A bullet shot straight up returns to its starting poid .;am) /dy8uiqei2gqnt in 13 s. What is the initial speed of the bull.i2a q8dd/;y )igqmeuet?

  A ball is thrown straight up with a speed of y0a+ar6djk3oj:g3 2ybad+qj36.0 m/s. How long does it take to return to its stdgj0j6 kbr33dy+yoaq :+ 2ajaarting point?

  A ball is thrown downward from the top of a building c tu:-0;m m.l) nv;mms 5oabfiwith an initial speed of 14 m/s. It stritmsvn;.: i mofc -mu)m; 5bla0kes the ground after 5.5 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in nume2szv)ol4oh-mka tye te5c(0,rical valueo) (tz,5k0yvale4m chs-et2 o 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, otdvkjz( (zclv8s406t6ca x6 x0gkk into the air with a speed of 38.2 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 8 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 8.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t = 1.04lztvu qbr*r5a*,+) wq vwm/ c s?

  In Fig. below, what is the velocity at t = 2.5y ch737fs jtl3dc/+ zm8ks ex- s?

  In Fig. below, what is the ve.c)f p81n -khke. vqrtlocity at t = 4.0 s?

  In Fig. below, what is the vd 6deklm( 8rx3elocity at t = 5.5 s?

  In Fig. below, what is thek*7d-c n1iwyxundu4pi ,z 84 i average velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 to 6.0gj3-yq-roty6 p3i pt7 s?

  In Fig. below, what is the acceleratiot*7zwl)+w35un vp9rmwbjx9 jn at 1.0 s?

  In Fig. below, what is the acceleratimy2f j.-ua4a go4gm/xon at 3.0 s?

  In Fig. below, what is the average acceleration from 0 tdg 8(k xe wwbsg8o.)a*o 5.0 s?

  In Fig. below, what is the average acceleration frout)uv d; l;cq6m 0 to 8.0 s?

  In Fig. below, what is the displacegq yq7(1kfb 5-;t nkfrment from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|veloci8 pdes+lm a,m c,mg 19wcpz13 phqv3l;ty}

  An object can have a varying speed if its velocity is cons9rj8az zxb ye45.yv-+q( tpkxtant.

  The velocity of an object can be negative when its acceleration is p y 3 jro7/wl;amtuc(c1.ehgxg/.nu)/v nff e4ositive.

  If one object has a greater speed than a second object, the first must h (tr+z,a)dz+ dgnu ,vzave a greater)ad,r++zzvzntd ( g,u acceleration.

  Two cars emerge side by side from ag h7s+;ubupg4 tunnel. 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 sdbr3 1- (*dpm ci1 iys6ll4qkypeed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It leaw9(j/: c0y i6qirlasu+ jrbb :ves the bat with a speed ofl6+( y:/ wqiab 0b9 usirj:jrc $120 \; km/h$. 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 acceleration,s; tc21wr)r -0*abn.duk fgl s how does it change if an2u skd)facg1 -tr l0br.w*s; ir friction is ignored?

  As a freely falling object speeds u9x 0qw*yw5 o//ypnojxp, what is happening to its acceleration, how does it change if air friction CAN NOT be ignorexowpq wj9y/xo5y*n/ 0d?

  An object that is throw fpxbfxe dm5w/ 2;z33sn vertically upward will return to its original position with the same speed as it had initially if air resistance is negligible. If air resistance iz fs5 m2e;3xxp/df3 bws appreciable, how will this result be altered?

  An object can have zero velocity and nonzeo6 +d)buh9rtr/. q8ew x9vrb ,r;ijec ro acceleration at the same time.

  An object can have nonzer nz:-khzq4d3ho velocity and zero acceleration at the same time.

  An elevator moving from the second floor to the fifth floor making no st j*2h dcyv;o81qmvek8ops alon j1d8coy2ek q*8hvmv;g the way has zero acceleration all the time.

  A rolling ball moves frd :bc6ldr8 zj 8k0f0xeom $x_1=3.0 \mathrm{~cm}$ to $x_2=-6.0 \mathrm{~cm}$ during the time from $t_1=1.3 \mathrm{~s}$ to $t_2=5.9 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.7 \mathrm{~s}$ is at $x_1=2.0 \mathrm{~cm}$ and at $t_2=4.5 \mathrm{~s}$ is at $x_2=7.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight comq;6*f mva yte6 6dafc(plete laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 7.3 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*(o 81swr9 x/(bmks.kt ovkx1xycj5u line, moving 92 m away in 10.3 s. kx vk rcu x yom(./1jt1k98ws 5*obsx(It then turns abruptly and gallops 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 fromc8so(/ h /kv/l:f kdeowf ta78 $12 \; m/s$ to $25 \; m/s$ 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 from j ujwv* c(gwf*7;tl;u$23 \; m/s$ to rest in a distance of 63 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reac+t8x6sqh0 pe )m+s svth a speed of $32 \; m/s$ 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 q87.ipe -z9x evy, ajrblocks to essentially top speed about avepj 7.9z8eriy,qx-$10.8 \; m/s$ in the first 11.9 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 unifrf 43u3ww wwu8ormly from a speed of $16 \; m/s$ to rest in 4.09 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 m lz c;:5*nmjn5tx o vl5kong on the highway. Assuming a deceler;5xjnc*otvzmk 5:n5 lation of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck going- u21wx ;gufyk $25 \; m/s$ 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 thet: x9d rk)y7* xyhhl;pgvpn+ ) 10,000-m run in less than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner must then)nrth)xd;p*7k: +hl v9 xg ypy accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$