Suppose that an object travels from one popkr 9e q0-ox9w8ky 9shint in space to another. Make a comparison between the displacement and the dop98h qek0 -sx9k9wyristance traveled.

  When is the average velocity of an object equal to the instantaneous velwwuh26e*4p hdocity?

  A new car manufacturer advertises that their car can go "from zero :ivq2 p-96autf7mqtd to sixty in 8 s". Thvmqqtp9:-dtf a2i 7 u6is is a description of

  An object moving in the +x a-qv. u :lgiyu)xis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction7 jxjcujc5 ekm( m,a4*) begins to slow down as it approaches a traffic light. Make a statement con*m,jc5ea7j kum (4xj ccerning its acceleration.

  Suppose that a car traveling to the West (-x di3lg+ih ndq+ulzf g1r/tu 7w 92a4jkt6 rection) begins to slow down as it approaches a traffic light. Make a statement concerning its acg9 4a duukjzhq1+l7+r 3tgw l2i6fnt/celeration.

  Suppose that an object is moving with a constant velocity. Mav:8* ifg4y fidwi0do3 ke a statement conc:wdd*30i4iygfof8 iv erning its acceleration.

  If the velocity of an object is zero, does it mean that the 5 kg(ravm gn8uxasjsun07 d++r r 9:9tacceleration is zero? Support you59m+gasaung8n k : j srx(t 9urd+v0r7r answer with an example.

  Can an object's velocity change direction when itsc e; a2pjti jm0gn03ziuc8v 6/ acceleration is constant? Sup ipn2;tacgj8u0v3 mz6ei j/0cport your answer with an example.

  Suppose that an object is moving with constant acceleration. Majl*vhy h zyzpgm4gt7*74h0 k 4tte 0.zke a statement concerning its mo hj*gtt7 0 l h*4hmvg.zk4yzptz7 e04ytion with respect to time.

  Can an object have inemw:k wy,7 g7pcreasing speed while its acceleration is decreasing? Support your answeg77 myw:ek,pwr with an example.

  Suppose a can, after an iny+yn8 z 2ymdb+0cqn ,(vy fz4pitial kick, moves up along a smooth hill of ice. Make a statement concerning its a(b8m4 ++yvnq2dpz0 cy yfzny,cceleration.

  Under what condition 99m2)nn 5dybxlb,zgnht 0x5m is average velocity equal to the average of the object's initial and final velocn9 mnx5,m520g9t l b zdy)nxhbity?

  Objects A and B both start at rest. They botfm mf07y;z qvmab1v0+h accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to tv7 m0ma q+z1vm f;b0fyhat of object B?

  Objects A and B both start from rest. They both accele p1jvyw vf)z/zs fg5.3rate 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 jpsz.zwvf g)/5f1 vy3 that of object B?

  When an object is released from rest and falls in the ad heop6,f) 4 cfkta0h5bsence of friction, which of the following is true co f 6hte4ph5)f0dk o,cancerning its motion?

  When an object is releew ij4(,8lbvyased from rest and falls in the absence of friction, which of the following is true co (j8wbeli 4,vyncerning its motion?

  Suppose a ball is thrown straight up. Make a statement abourx3 s0r2: et1rm8 lryat the velocity and the acceleration when the ball 3m2yrlrax0 e t81:rs rreaches the highest point.

  Suppose a ball is thrown straight up. What is its accelebo -oj ,xbo4s ) k;+at2/htoaeration just before it reacheoo4bt /s)xoa- h je2o b+;tak,s its highest point?

  Suppose a ball is thrown straight up, reaches a maximum height, then fzvcg1a-huin627v ny 5 alls to its initial height.va7i ygncu hz5621 nv- Make 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 height, then falls to itjs95/ k-okev ts initial height. Make a statement about the direction of the ve9s t /jo-kkve5locity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of aic hr8q *bhj*0rmh0 dbs.rok 33r resistance. Make a statement concerning its accelerationcor.3r0 mdr8j bk* 3h0 *sqhhb.

  Suppose a skydiver jumps from a high-flying ; l4cgetl1ov0/iu a y b,6:cdez*xx2lplane. What is her acceleration when she she reaches terminal veloc:, l14tvecyb*glacx;xe/206zu ld oiity?

  A ball is thrown vertically upward with a speed v. An identu: v 6j+4q *)hemitaqvical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the second ballu+aqj*v )q : e6vimth4 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 szvwu9* .xi.j recond later, ball B is dropped from the v .zr.jwu9*xi same building. As time progresses, the distance between them

  Ball A is dropped from thu,jvp5ugmo +niu 31 e)d+i)m3+xod s pe top of a building. One second later, ball B is dropped from the same building. A+u15i dpjgo3)3e+ dumsvu m)xpnio, +s time progresses, the difference in their speeds

  Two objects are thrown f rxj85p;zgy0nrom the top of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit tny5g8 jr;z 0xphe street?

  A brick is dropped from the top ohbv.w 9px +wndk)sp91jrt1 5h f a building. A second brick is thrown straight down from the same buildi tv1w9 p.9b5j+kwd nrx p)1hshng. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant nakzc -vjn01 7qf58k3d6 uzjinon-zero velocity in the +x axis. The position versus time graph of this oi7qkza8v 013kczf6 n5jjnud - bject is

  An object is moving with constant non-zero acceleration in the +x axis. The ph4 g08pww uoi:osition versus time graph :wh4 up8wo0igof this object is

  An object is moving with constant non-zero velocity in the +xt*w*u-,od.cpy f q /me axis. The velocity versus tim,pedwuq* -fyt/.com*e graph of this object is

  An object is moving with constant non-zero acceleration in the +x aro 7dg1oq 3o3,hw vh1wxis. The velocity versus timqw3 gr3o117o ,hvwdoh e graph of this object is

  The slope of a position ve,q*5uyu : )bqhpjncslfu8yr5h i46; grsus time graph gives

  The slope of a velocity versus timtpc.08 . fri/lisk ey3e graph gives

  The area under a curve in an acceleration versus tiu mp/a n* 9y5gjr:al:eme graph gives

  The area under a curve in a velocity versus *gj 4ttzaqj)+ time graph gives

  If the position versus time graph of an object is a horizons3hkyt s.t-c: tal line, the object iskt.:tchs3 sy-

  If the position versus time graph of an objh,d8gscdd) *t ect is a vertical line, the object isddg *h,s8cdt )

  If the velocity versus time graph of an object is a horizontanhbj91 th) yq1l line, the object ishb9qn y1h1 tj)

  If the velocity versus time graph of+r0rcw9 cm3qk 6 rxdm jz.hmo .ub::kby90nd1 an object is a straight line making an angle of 30 degree06bwk9.xbj9 r mry dk m:3cdrh0moq.1znu +:cs with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find b*p6q)mk2-z erj9w vjk g2ljpyg -03h joth the distance traveled and the magnitude of the displacemezjrj-32 ) 2pg vw9lhkgp ke y6j-0mq*jnt vector.

  A boat can move at 30 kvol m/tb* k w92fh,p56 coe)it+*div8aho /scm/h in still water. How long will it take to move 12 km upstream in a rive8m + *h*iac/v /o6ctlkf, p5othbe)w9vsd o 2ir flowing 6.0 km/h?

  55 mi/h is how many m/s?/()p kp;qnj, xv,sqzs (1 mi = 1609 m)

  What must be your average speed in order to travel 350a/ ;3 3*nk ynkmirmqc. km in 5.15 h?

  A runner ran the marathon (approxinz;z486z7 hc zcivyi 2mately 42.0 km) in 2 hours and 57 min. What is the average speed of the runner in mc68 zivnizcz;4h7z y 2/s?

  A car travels 90 km/h.:4w zl s. vo8sb0tg;uf How long does it take for it to travel 400 km?

  A ly (light year) is the distance that light travels in one year l7p)ge i 0o)+yhcs5wc. The speed of light is75gscw)y+eicl pho0) $3.00 \times 10^8 \; m/s$. 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 and you look u3 v59odjh d,em06csz cq;oc9to the side for 4.0 s, how far do you travel cd506qve,cu93j o ;mzsh 9od cduring this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 sih mmd5z).is: , your average velocity i id5hi.)smmz:s

  A polar bear starts at the North Pole. It travels 1.0 k)p6dt t*yit. vm south, then 1.0 km east, tt) dtvt6p*yi. hen 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 speed?

  A polar bear starts at the Nortxy esh0 sco:(.vd8w; xh 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 point. This trip takes 45 min. What was the bear's averag:8swyxdo0hse c;(x v.e velocity?

  You are driving home on a weekend from sch+n u7ri6;rw0c ay+qzrool 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 and 15 0zu6i cy+7raqrw;n+rminutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at p8*xi:rjf t*7 o 569ivltpxwf100 km/h. What is the average speed 5w8r ofvtl *:tfx x9ipi*j7p6of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her 6jx (ma:7,7gic.hrqg0ptsfbaverage speed for the trimp6cgx:,gsa(7 b07 q fith jr.p?

  An airplane travels at 300 mi/h south for 2.00 h and then dc 8q/4ozs:c eat 250 mi/h north for 750 miles. What is the4qdscceo :z/8 average speed for the trip?

  In a 400-m relay race the anchvfuxcl:e anu93t/ x; 2g9n-tborman (the person who runs the last 100 m) for team A can run 100 m in 9 nutex;vn 2c-x3g atl99fbu:/.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 the team A runner not lose the race?

  A car decelerates uniformly and comes to esg cejf3)9a w ky4jb7:1bo2 na stop after 11 s. The car's average velocic4k y ae9bb n)eg:wo2j j7f3s1ty during deceleration was 31 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed fromu e07np: md(gr9 l/afh 100 m/s to 160 m/s, at the average rate of f9p /a 7lne 0gu(:mrdh$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the ratxqss8 tl: 3o n7mnk0n(e 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 accelerate*1bmofj7o4 ccs 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 constany4xjg 1q;tvdt;d) e g:t acceleration eg: ;qxdgvd;t1 jyt4 )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 3.8 m/s experiences a ca1 w4pvo5*tj 8e9d jqqonstant acceleration ofe9j4w qjtp 1dv*8 aqo5 $1.0 \; m/s^2$. What is the cart's displacement during the first 5.6 s of its motion?

  A bullet moving horinpyxrb9b(h*d /8fi 9 6rk r3qlzontally to the right (+x direction) with a speed of 341 m/s strikes a sandbag and pene 8 rqrlp3/b99xkh6dyi(*fnbrtrates a distance of 28.16 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 cs: : zuq6v)q k f+(adckcpco;4yg5f3oarrier. It reaches a speed of 42 m/s akq6f:f)k vop34o a ; (q cs:5gdcyuz+ct 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 withq79 rl4bosyj:k 1: jtb 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 dioji p+,cy4 cp3g)tc 5-ol3mm wstance of 200 m. What is its average acceleration)3lmm gctcio, ywp-5 3p+o4 jc?

  An object starts from rest and undergoes uniform acceleration. During the fi0pv *:hr:a7:nyp qymoj 5e2tnmh 8 5cgrst 0rgc t:apmvp7ye5yo 8j:h h5*qnn:m2 second it travels 5.8 m. How far will it travel during the third second?

  An object is moving in a straight line wm7mh82oeazf 1v2 ez0tith constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is70et1ea2zm oz8hm2f v traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates uniforhr1ob 6t1m(z.o(ldh w mly 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 decele31(y qror8o6 m*v2nbvgfhl rzji-2; grate 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 l(b i4tjs4 23 rybypw7v8l-fz iight turns green, a car that has been waiting at the intersection start8brybs 2 yw-7j(fti4 v zl34pis 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 86bp0b yn+hlmefd4 8o where the acceleratio+fd8eonl ph bb06 8m4yn 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- gz:1g3qo/ x3gpg mmo+3mjea X where th-31g+ pgmo 3jm aze gxm/3o:qge acceleration 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 planeta:8fo1a nco gnsc94o :*z o5go4 :xivt X where 4voc8 1gng9oo :naf t5:x*zo4ci ao:sthe acceleration 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 t 4b5 ts.recd 7j1lv p6uw0,dta speed of 14 m/s on the surface of planet X where the acceleration due to gra tcdpuv srl5jw0e4b 16t,dt7 .vity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usua cf8goje c4k szu882pg;j, yk9lly greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler t8cco;kfzs,4e8yj9 ku8 pj gg2o fall before you catch it?

  A ball is thrown upward at a velocity of 199h6mqrbu uxl4 7hc 14ezmoqf-+m1j c6.6 m/s. What is its velocity after 3.00 s41 uue6bh6+jc fqxz4q 71comh-9 lrmm?

  A bullet shot straight up returns to its js;(jrb)d obm)v x3 hv19ln6s starting point in 11 s. What is the initial speed of the buj1)xh;n3s (s6blr o9v )bjdmvllet?

  A ball is thrown straight up with a spj9 2lono8k+ ereed of 36.0 m/s. How long does it take to return to its star9lnr82o+jo k eting point?

  A ball is thrown downward from the top of a building with an initial speed opk6irm. k4 1dcf 29 m/s. It. 14imk cdr6kp strikes the ground after 3.9 s. How high is the building?

  A ball is thrown straigh dq)k (a0ki0ght up with a speed of 30 m/s. (only fill in numerical value in ti)hq 0k g0a(kdhe 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 iackct9o1h6wix5lf v0 l,w 2tq 51um z.nto the air with a speed of 22.2 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 1 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 at t = oy(:r /buj 0r0fwu2gg 1.0 s?

  In Fig. below, what is the vvqkf7;ttv 9r22medw u 6lxd9 -elocity at t = 2.5 s?

  In Fig. below, what is the velocity at t = 4.0 sw;tsdw+aax* lfl8 s9,t . i,cu?

  In Fig. below, what is the velocity at t = 5.5 s1gtlu+ o:1dte u5jjl8?

  In Fig. below, what is the average ve h ky4vk3b2j;elocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 to ;9okqt fot8wv :5axq*6.0 s?

  In Fig. below, what ik z jb -oj-/60bvdvw5xs the acceleration at 1.0 s?

  In Fig. below, what is the accelerat.5 9nfepj*gyqion at 3.0 s?

  In Fig. below, what is the average accelerath0)ux8 c i7a/ + :rmako+*nieubkl 2shion from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 to 8.0 ;5sa5v7*z ;ktm, zqo:fsxc w cs?

  In Fig. below, what is the displacement from 0 tocw0;q/ib bls6 8.0 s?

Does a car speedometer measure speed,qgx 0ik0ndeg, - u7yz, velocity? {speed|velocity}

  An object can have a varying stui ex *ds-r)w2;qx3 kpeed if its velocity is constant.

  The velocity of an object can be negative whev)z r(v:e.izer np9,l+yg8gnn its acceleration is positive.

  If one object has a greater speed than a s **h+x/af sqgjecond object, the first must have a greater accelea**fxj/+q h sgration.

  Two cars emerge side by side pbv( ivol5m,5from a 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 inchic9 /hb+ he+qreasing in speed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It leaves th7xtot3cu,v s 5e bat with a speedo7v 5tt,sxuc3 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 happening to its acceleration, hxdy)0at4*lw o ow does it chango4x y0t*w)alde if air friction is ignored?

  As a freely falling object spe6 )6ehgj mupm;i)tkg (eds up, what is happening to its acceleration, how does it change if air pme;m(t)ig 66gkh)ujfriction CAN NOT be ignored?

  An object that is thrown vertically upward will r.px45ri s bn3zeturn to its original position with the same speed as it had initials x5in .3zp4rbly if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zhn k1hkmo2l xyfohq;-u/,; 3eero velocity and nonzero acceleration at the same time.

  An object can have nonzero velocitc, o5jfb4s/5v j tofek1:y r,ey and zero acceleration at the same time.

  An elevator moving from jzyt1p)9n 2k dthe second floor to the fifth floor making no stops along the way has zero acceleration all 1 npky29z )tdjthe time.

  A rolling ball moves;*y kwqq47l yuv8b zyia 1c8f0 from $x_1=2.7 \mathrm{~cm}$ to $x_2=-4.9 \mathrm{~cm}$ during the time from $t_1=2.2 \mathrm{~s}$ to $t_2=6.1 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-5.0 \mathrm{~s}$ is at $x_1=2.9 \mathrm{~cm}$ and at $t_2=3.1 \mathrm{~s}$ is at $x_2=8.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps aroundczu0mq+8o t,1pu8eid*k bs/y a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 10.1 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 straiswfa o .ngahbf/ jx2w c81cd32op+f:dw.z+s5 ght line, moving 109 m away in 10.2 s. It then turns abruptly and gallops halfway back in 4.8 s. Calculate (a) its average speed.+gfn./f:+jc1w 8h a2sd5wsacd p 2b xo wzo3f  (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;i v(u pu.7be adbd04k 0q1out $12 \; m/s$ to $24 \; m/s$ 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 from:gd2 sk7 xdgl/mf )6ov $18 \; m/s$ to rest in a distance of 64 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a s l,j0eq(t xnkw5i + 6qk)zp9xepeed of $31 \; m/s$ 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 blockcz1na u0hdag2n9 ks p+y 9f,j9s to essentially top speed about9znn9aujg s ,19+ hfp0c ayd2k $10.4 \; m/s$ in the first 12.1 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 syhum3 9-bjf 5wpeed of $20 \; m/s$ to rest in 4.28 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid mars) * ,crdmg2bpks 92 m long on the highway. Assuming a de b) gcpmr2,s*dceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truc;u t a q2ko3:w:bqyznh-3nyw; .yym5n k 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. g0htxo+7j;:8 -kn e 5:vsmbpwmr5r fvAfter exactly 27.0 min, there are still 1100 m to go. The runner must then accelerate+rohbe7: fs5nr 5gjt80vvwmkx - m;p: at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$