Suppose that an object travels from one point in space to ay;*s4 eins:*hgu5oon 62kc wwv)b t/znother. Make a comparison between tsb othnv/*is5z:)oyn2gwe 4;6wk *cu he displacement and the distance traveled.

  When is the average velocity of an object equal th.:6c7x;bpg6gtv cg vo the instantaneous velocity?

  A new car manufacturer advertises that their s;vy7.a 8pj* gz (rxrocar can go "from zero to sixty in 8 s". jsr8v(rxzp g .*;7yao This is a description of

  An object moving in the +x axis experiences an acceleration ok(jlpp-po6k;f gr,6i f $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to th6 n hdi0ra*t;te East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concernin0d t n6h*iar;tg its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slow3sd b.u5tc):ak dk6+ -xsa3y xj,fdrw down as it approaches a traffic light. Make a statement cosjdu6as,r x+bw): xka d.t k5f3yd3-cncerning its acceleration.

  Suppose that an object is moving with a constant velom2 xn m8bdu,:6cru84)( qq b) cqnimircity. Make a statement concrnbdqniq8):, 2 umq) 6r (m ub8ccmix4erning its acceleration.

  If the velocity of an object is zero, does it mean that the acceleration i, dt hskj*t 2wq ca2/va),(xsts zero? Support your answer with an exampletws(h, * vt/cx, d2jqa)k2 sta.

  Can an object's velocity change direction when its acceleration is c0 nvt 05p zs8pgel ijpvfh5w9i62:l6 uonstant? Support your an wl66fp80szg pi 29 vjvpit5lu0e5 h:nswer with an example.

  Suppose that an object is moving with consta; ov1l. ek5zbwnt acceleration. Make a statement concerning.w;vol 5ze b1k its motion with respect to time.

  Can an object have increasing speed while its acceleration is decreasing?jel1xe3va(4 0ai. 4h jud9i xw Support you.1va4ew9xie dh j l(u04i3 jxar answer with an example.

  Suppose a can, after an initial kick, moves up along a smooth hilrl dq7p)1+vxng tk2- il of ice. Makeri1+vqg)dk pl-2tn x7 a statement concerning its acceleration.

  Under what condition is average velocity equal 8yt 4hrebj gn:a*7jm;to the average of the object's initial and final ve 74e8;hb gtnjjr:yma *locity?

  Objects A and B both soymgw*zc9-leq q29uv )e w4-t tart at rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What it ewulw 9e q-c9z4 moq2-gy*v)s the final speed of object A compared to that of object B?

  Objects A and B both start frocrqh.tgs ydy g)ms1i*9 ,vy .0rzxs -*m rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. Whasi-rmsxdcyyh),gz1y. .* v r0q 9*t sgt is the distance traveled by object A compared to that of object B?

  When an object is released from rest and falls in+ c.coc f+:ovz the absence of friction, which of c:+ vocfc.o +zthe following is true concerning its motion?

  When an object is released from rest and falls in the absence of friction, whvcu 3.b)oep-pich of the followvb) pc.o 3ue-ping is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about thlh5j+g)n(llanz ,7grtdvy,wwr 64+ we velocity and the accelern +gt)4 5 ,l g(w lvl,j6zy+war7dwnhration when the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its accelervc grgaes0p/ h7 fh1,*9u ih6kation just before it reaches its highest po 0/hiv7r16fs,gup hcg 9he*k aint?

  Suppose a ball is thrown straight up, reaches a maximum he(iczf-rg* x8 wk+ zjd*wz v:q.ight, then falls to its initial height. Mqw: vdzxcw 8 zj+-ig(.f*k* rzake a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum heigh.ihu 0 er-h*.hm;.mcxjcc j2at, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the bal;h c -*.aih.02xuehm. cjj rmcl is coming down.

  Suppose a ball is thrown downward in th u-qycao2q91 te absence of air resistance. Make a stateme y1utq- o9aq2cnt concerning its acceleration.

  Suppose a skydiver jumps from a 1.3sy* pnc* 54mjat1rf uumcrhigh-flying plane. What is her acceleration when she she reaches terminal velrfu jprcu14ct3*1my5m*sa.n ocity?

  A ball is thrown vertically upward with a speed v. An identicwm0ftk)gjlqx6oc s5* 7 o8xo0al second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of thox om*qfwl5x0gc 8o76st0) kj e 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 auuyq4/g q- vmzn i*24 xl:bi7x building. One second later, ball B is dropped from the same building. As time progresses,i:bx-42*zl gim x4u7uvq/y n q the distance between them

  Ball A is dropped from the top of a building. One second later, ball /o j) 5h:kz,hmcnewr8 B is dropped fem/wo n5j, :h)zr8 khcrom the same building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. - nuaj3vh u+dk.xv m(/ +fn;bvOne is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hitna -+jnd.vmb;x u+vvu/(fkh3 the street?

  A brick is dropped from the top of a building. :tor, wmz 6h .wcgvz*+A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the two br wc+.z* v:o,wzrh 6mtgicks.

  An object is moving with constant non-zero vel)pjavio*+a *p ocity in the +x axis. The position versus time graph of thisp+*) avja* poi object is

  An object is moving with constant non-zero acceleration in the +x axis. The p(ijpq68esr; position versus time graph o6p;(pr8esi qjf this object is

  An object is moving with constant non-zero velocity in the +x axis. The veloc;l6i)v:zbour ity ve i)v uoblz:;r6rsus time graph of this object is

  An object is moving with constant 29tp/ m/d 2subdcu i+vnon-zero acceleration in the +x axis. The velocitt/b d d2mvs/9c+ up2uiy versus time graph of this object is

  The slope of a position versus ti )3cghp(n g h0sv.xr0qme graph gives

  The slope of a velocity versus time graph givelkdmnlg64x /e a ,8,q bzq-ocd(gs/s4s

  The area under a curz+jjq6yq; m 5fve in an acceleration versus time graph gives

  The area under a cur a,y 8eouicg499, nfqzve in a velocity versus time graph gives

  If the position versus time graph of an object is a horizontal line, .,fep)axu sb 4wq3dm ;the object i wxd3 m. a),4pufqeb;ss

  If the position vers coo00brk+:vh* 8ckg 1dy a)guus time graph of an object is a vertical line, the object is0 8u o hk)+0c: vbkd1oragc*gy

  If the velocity versus time graph of an object is a horizontal line, the object g8n bnl+ -./vr /gcrvccvgc//g+blr. -n8r vnis

  If the velocity versus time graph of an object is-i;1 zrp:n cwg a straight line making an angle of 30 degrees with the time axis 1zi:nrp c-wg;, the object is

  An object moves 15.0 m north and then 11.0 m southk- lvw/o ro):z. Find both the distance traveled and the magn) wo:vrl/ zo-kitude of the displacement vector.

  A boat can move at 30 km/h in still water;r;*z:m fkx)0y wayo m. How long will it take to move 12 km upstream in a river flowi0ka ;m;xo fwm*:yrzy)ng 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = v ,fn yprgzp,6a2*elx:i(6pn 1609 m)

  What must be your average speed in order to t. ;e d.hzdyirshu 0(z.zelh3 6ravel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min. What hco4plz;nn2n6hj447a a 0 h)sx cakk+is the average speed of the runnerx4)n46no4n lskch2 0 a;h7 aaphjz+k c in m/s?

  A car travels 90 km/h. How long does it tapu; b8fgz: q(,) mg*chky/iy pke for it to travel 400 km?

  A ly (light year) is the distance that light travels in one year. The speev+q/l;z..zciu uv x6sq .0hhsd of light 0 v 6.qusv.zsu z;.ihlqxch+/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 s0of h0mhd67nbtraight road and you look to the side for 4.0 s, how far do you travel during this inattentive periodh0bn 7hmo60 fd?

  If you run a complete loop around an outdoor track (4vb4+ -uep:xvjl18.uwh7hkxa 00 m), in 100 s, your average velva1+uk4u.-8lvxb hjpxw 7h: eocity is

  A polar bear starts at the North Pole. It travels eyzs, i(1 bv2 go7v8n-m okx7r1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to se1k(mi8xrgv 7-2z nvob7y o, return to its starting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the N;lyg-/ r(f4x blaqqa/2oxs x,.el oc( orth Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km nor 4lqoc(yxx,/2g.-o/ flq ;lb e (rxasath, then 1.0 km west 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 schoo0kt:d91qzfe ul 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 andf9 :u1de0q ztk 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at h4 q:l:iiauho5br33 m80 km/h and 160 km at 100 km/h. What is the average speed of the motorist for this t5i:o4rab :qi3m h3uhl rip?

  A motorist travels for 3.0 h at m xize/+ jo(gx 2( 7csl.jrc.r80 km/h and 2.0 h at 100 km/h. What is her avera 2 jc+zrxie7.cs /((jlxorg .mge speed for the trip?

  An airplane travels at 300 vf,k2w x bfl5ehjbbn,o,-+5 z mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. What is the k+2 wb-e nb 5,,lhfvo5x jb,fzaverage speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the lastz+i-+fldt n-h,g:4z al) ky6foe*m mo 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 m:-o gi,dt6fln 4koyhl-z )fze+*+ma 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 13 s. The car'e p u1.sf (cguy1g8fsl.74cgps average velocity during deceleration was 77 km/h. cu.4gy11uespf7l.sfg g ( p8c What was the car's deceleration while slowing down?

  An airplane increasesx vv)sm fuz 8x)de:74a its speed from 100 m/s to 160 m/s, at the average rate of a7de x)u z4xm:vv s8)f$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h f.4zw /:vl*qm:/n 5ktk nxkygaccelerates 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 rer h 6c4l 96 m-uvr;j7gyd8hland 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 up with a constanoa5: .gy ji;kvv+abi ;wq41q8m; eaaet accelerationw om;:a 4.aqv+;yi j ;qvaa81bg 5eeik of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initia n:-h*k z2tehrl velocity of 3.1 m/s experiences a constant acceleration of -e*tr:2kzh nh$3.9 \; m/s^2$. What is the cart's displacement during the first 5.2 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed onz-- 1/ dfuncsf 444 m/s strikes a sandbag and penetrates ad/-ncuzs- f1n distance of 59.98 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launchey0rj,jlh62b u( yow+nd from a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of th,n 2 bj(yrj l6u0yhow+e 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 const-(j6 3 dnvuwzvant 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 dista:d jxu7/(oga u:25dhj cq2rrq nce of 200 m. What is its average acceg q/j2urr::( ocxuhd7j52 aqd leration?

  An object starts from rest and undergoes uniform acceleration. Ds3:/c*fm9wz2hkn8 phjrw n( j uring the first phr/ hn 9(j wcn8jf:2s*m3kwzsecond it travels 5.8 m. How far will it travel during the third second?

  An object is moving in a straight)j xpqx7,/vmizju6 ;p line with constant acceleration. Initially it is traveling at 16 pzqxjv6,) ;xi u/p m7jm/s. Three seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and acceleratesagijn7wl2y1p+e k ne(2*0n oe 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 roehm(r* + 29 hjvpich/tad can decelerate 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 green9 de i*tzyo6ovq,w(*u, a car that has been waiting at the intersection starts ahead with 6oy*z,i udt(e*w 9ovq 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 ,9q(;iqjace t the surface of planet X where the acceleratioe j(qit,;9aqcn due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upwan-r*t1,eerse7+b by/ag + cjjrd with a speed of 12 m/s on the surface of planet X where the accega-7*e s jnbe rj t1y,+b/+ercleration 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 speed0n ,nx4e bgn3t of 15 m/s on the surface of planet X where the acceleration due to grtb4xn,n e3 gn0avity 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 d q) ai4/ mflwc*wun:/surface of planet X where the acceleratio flm/ c4a nwiu)wqd*/:n 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 4 7pm1angd a7d0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall before you catch it?d na4a1g7 mp7d

  A ball is thrown upward at a velocity o:m m2yxf jj vqo57d(f.f 19.6 m/s. What is its velocity after 3.002. jo(: vmm5jxffyd7 q s?

  A bullet shot straight up returns to its starting point in 17 s. m; xftx(i6xm3 What is the initial speed of thx6fm(x3; xm ite bullet?

  A ball is thrown straight up with a speed scfd nw*x)74cof 36.0 m/s. How long does it take to redsnxf) cc7*4 wturn to its starting point?

  A ball is thrown downward from the top of a building with an initial speed of 19hwd vtlm72oe tl,n, ;jys-fqxu8n 6 5 m/s. It strikes the ground after 6.6 s. How hi7x vy;,-d2ltq ,6n 18luens9 wftmhojgh is the building?

  A ball is thrown straight up witl0zdktyljwf6: ;w/5e h a speed of 30 m/s. (only fill in numerical value in the/ekfzl 0tw: yl5wd;6j 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 x/vi * pic++rleelm:5up into the air with a speed of 24.2 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 12 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 12.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the v f) ma,t-no2 1gmlyc9)sh zj9kelocity at t = 1.0 s?

  In Fig. below, what is the velocity at t = 2.5 sa8o6vcpk v9.y?

  In Fig. below, what is+ tjrm1gi m61jimjm12 the velocity at t = 4.0 s?

  In Fig. below, what is the velocity at t = /2l.gn0 zucuecj e7a95.5 s?

  In Fig. below, what is the average velocity wb4tg30+cvyr-wv i/bfrom 0 to 4.0 s?

  In Fig. below, what is the average velocity ,)pdyp7i*ub way6 m6mfrom 0 to 6.0 s?

  In Fig. below, what is thxb z0sgvxcbb- u(b57,e acceleration at 1.0 s?

  In Fig. below, what is the4 c 4ye9j4whond7uf)r acceleration at 3.0 s?

  In Fig. below, what is the average accelera:j n+iovus);jtuee uo:xe 227tion from 0 to 5.0 s?

  In Fig. below, what is the avern8,m2fq9 qqde2 /lkgg age acceleration from 0 to 8.0 s?

  In Fig. below, what is the dis9c5ws ob 4jd77to jkg.placement from 0 to 8.0 s?

Does a car speedometer m(ywwdesu:v .xxp n;8 c 1 7td*2aqmqs+easure speed, velocity? {speed|velocity}

  An object can have a varying sp yb(nd)e( tufcbln1(w rc8g2 +eed if its velocity is constant.

  The velocity of an object can be negative when its acceleration is po)h/krrfar:qk* ( sqf aa k4n1:sitive.

  If one object has a greater speed than a second object, th7-,9q c h px0c1wgvgmge first must have a greaq 0cg,-xpv1 gwc97mghter acceleration.

  Two cars emerge side by side from a tunnel. Car A is travelmj,3oi4 dh7hx ing 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 accelerationd 1r.l5 hn7ouz;9prb:r fp 6wu decreases.

  A baseball player hits a foul ball straight up into the air. 3ws(qb ad/r0s It leaves the bat with ads0b ar sw/(3q 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 spe,/2octdmjzst5f hf ; ;eds up, what is happening to its acceleration, how does it change if air fz;fo d,s f5mc;j2tth/riction is ignored?

  As a freely falling object spgz8dd6gzt1k kxe-g* 85l3c xpeeds up, what is happening to its acceleration, how does it change if air frictg5tkz kp8xgg*xe-z8d3 c 61l dion CAN NOT be ignored?

  An object that is thrown vertically upward will return to its origind /8apbaqi g43 9yjzv,al position with the same speed as 3ygz9ab/d pa,4j i8vqit 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 acceleration at rsbz tff:-ksfucl92rse+ (7,the same time.

  An object can have nonzero velocity and zero accel2 k57lcmk n+qq,ln*uleration at the same time.

  An elevator moving from the second floor to the fifth fl7c9h bhimc4 e-j0 3wbfb aw,tjn *6w2*ibs6mfoor making no stops along tf7et6 cmm*nb6 3sb i4jaw2fw,- bij 9chw*b0 hhe way has zero acceleration all the time.

  A rolling ball moves from n-f+a 2wfj t7r$x_1=2.8 \mathrm{~cm}$ to $x_2=-6.2 \mathrm{~cm}$ during the time from $t_1=1.6 \mathrm{~s}$ 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 $t_1=-4.5 \mathrm{~s}$ is at $x_1=2.2 \mathrm{~cm}$ and at $t_2=4.3 \mathrm{~s}$ is at $x_2=8.1 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps a032cdt6n7 qr anw7vt *sm7ysw:itns( round a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 11.5 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 lw+.oz1dd 0i caine, moving 106 m away in 12.2 s. It then turns abruptly ani d 1w.da+0ozcd 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 fromw /k..jcx /1yssv -ouo $12 \; m/s$ to $24 \; m/s$ in 5.0 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 frouw.m 6sv1j4; fkj ha(tm $16 \; m/s$ to rest in a distance of 61 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reacr9xyizl *( msbs vg69irz :c1/h a speed of $30 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.5 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the bfm.y; 0c wv)uok,sdi+n r5ig;locks to essentially top speed about ;,.i)yduv; g0 +ncirm5ws k fo$11.2 \; m/s$ 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 fros, p y:p0)o2 8:emcxqgn+pbjlm a speed of $16 \; m/s$ to rest in 5.73 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. Assum, yi- 6ebsjmdh)hi .6ming a deceleration ofbsym).ejdih m i-h66, $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goi iuytdw:9olnvo6/ 3 7 d+ssd4wng $25 \; m/s$ 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-mt7 w 6ok6lmfu8 run in less than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner must then accelerate at lku ft687om6w $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$