Suppose that an object travels from one po8m fdpv(*f-pzint in space to another. Make a comparison between the 8pmd f-zvf (*pdisplacement and the distance traveled.

  When is the average velocity of an object equal to th yu 6*:t0ai;itvv,oaie instantaneous velocity?

  A new car manufacturer advertises that their cvkpy3ej z22)bq d67ctar can go "from zero to sixty in 8 s". This is a ddjpqc)evt 6 2k 2yz3b7escription of

  An object moving in the +x axis exper- by 31zko ni8+5gzmhtiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car travelingqw23a)q/ 3rj ezn,xs t to the East (+x direction) begins to slow down as it approaches a traffic light. j/ 3xs nrq2),atwezq3 Make a statement concerning its acceleration.

  Suppose that a car traveling t*zvlj3xrj95v6j+8 nk n2t nf jo the West (-x direction) begins to slow down as it approaches a traffic l68nnk2nt3jrj l5 *vz+f9v xjjight. Make a statement concerning its acceleration.

  Suppose that an object ieu yv1p ee)14hs moving with a constant velocity. Make a statement concerning its ay e)hpe4e 11vucceleration.

  If the velocity of an object is zero, 7;p/hp o;h2:be oh ua-;/yk p,q+oa ga, zewpgdoes it mean that the acceleration is zero? Suppor:7gph+b/p; ,qhpu2 kg ;,yo;ahoewa /zpo ea-t your answer with an example.

  Can an object's velocity change direction when f/ka/ eazj- aw6- 3angits acceleration is constant? Support your answer with an example.n6-j 3-/kfagaz w e/aa

  Suppose that an object is moving with constant acceleration. Make a statement 81-q+z mb(sd/uoae (led8 bizconcerning its motion with respect lb1 ez((aue8do +bz i/mqs8d- to time.

  Can an object have increasing speed while its acceleration is decreasin t-1mff vty25p 0hwrb2x-1bo wg? Support 1fv21b-f2hb tx-roy tp w05 mwyour answer with an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice.2kz(uj gs7wtl1f/ uhn0*n 9sy Make a statemsz gjut s(* 1/0nkl9nfw 2huy7ent concerning its acceleration.

  Under what condition is average velocity equal to the average ogblk 0-967 *sf6nlr5wzejhvw f the object's initial and final vl67rf-5 0j 6 hebvzsg9 nww*klelocity?

  Objects A and B both start at rest. They both accelerate at the same rate. Howlatn42g tzn( xgn 5)z5ever, object A accelerates for twice the time as object B. What is the final speed of object A compared to that of object B?42 n5tng5lxtz ) ngaz(

  Objects A and B both stazy(f:ob9xbl . 7rp,qfo5 ;k gvap*c7vrt 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 of obje;bkgbof7 l9 r(qyp*f:v7p z .c5avo,xct B?

  When an object is released from rest3qd( enc8a*bgn yx9;n s+i.im and falls in the absence of friction, which of the followd+9ny*ni; 8is canm3xb q.ge(ing is true concerning its motion?

  When an object is released from rest and falls in the kv5 xf*ac8 it.absence of friction, which of ia8ftx*5kv. c the following is true concerning its motion?

  Suppose a ball is thrown straight up. Makeo+f m-ci2qwa2 a statement about the velocity and the acceleration whec-am f+wi22qo n the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration just befo+ lg il/wc 1pkjn (okmq+eu*22re it reaches its highest poijuk+ 2lgp1e l+*ok/qw m2c (nint?

  Suppose a ball is thrown straight up, reaches a maximum height, then fallib d4.pst8iu r tn4x86s to its initial height. Make a statement about the direction of the velocity and acceleration as the ball i4s 46 t8druix.i8t npbs going up.

  A ball is thrown straight up, reaches a maximum height, lesu vt 2r::vuj ,isg s.1ww 4j6.nu*jthen falls to its initial height.:guw ut, l rj:1.wv*4vjnsj6iu2s s.e Make a statement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistance. Make a p:7ww cqt ck4(vu,w;(9 kzkne statement concerning ikcu (vcwk ;en ,kqt7(:p9zww4ts acceleration.

  Suppose a skydiver jumps from a high-flying plane. W1ahcg o + -p/myl3tzq4hat is her acceleration when she she tza h+l-q p c3/my1og4reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical se -m gi7,qemqtq g2cr2/cond ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maxi7g-i,g t/r m2q2cemqqmum 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 a building. Oo-w hcg/vuv u,nd;z)olg**p 5 ne second later, ball B is dropped from the same building. As time/ c*gz-nw5 gvol h*u u),op;dv progresses, the distance between them

  Ball A is dropped from the top of a buildinn6o .9+z nfiv6j)fpvlg. One second later, ball B is dropped from the same building. jvv.6pn9l6izffo)+ n As time progresses, the difference in their speeds

  Two objects are thrown from the top vsinds wf-uwi8- ( h/0d,)towof 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 the street-)t/oni,fwws-u dw0 i h(8vsd?

  A brick is dropped from the top of a building. A seco+)ms z/wk)nhssq:z +s g7mi 2 :1otvkjnd brick is thrown straight down from the same building. They are released at the same time. N2nhj mss/szmg) :v:kswi1ko) +q+z7 teglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with consta)8s9:q tofb-faxbpa 9nt non-zero velocity in the +x axis. The position versus time graph of this obfq9-x) 9abstp: o8abfject is

  An object is moving with constant non-zero acceleratvs(1oqn h: 9biion in the +x axis. The positions 1vh:( i9onbq versus time graph of this object is

  An object is moving with constant non-zerx+v :z giew1x,o velocity in the +x axis. The velocity versus tim1zvx+w ,xegi: e graph of this object is

  An object is moving with constant non-zero accelere in 8b+nk1zjbk, cy;d )) 9omo)wqtm0ation in the +x axis. The velocikt9 80nd)jz) 1i;)cno +owbbmk eqy m,ty versus time graph of this object is

  The slope of a position versus time g2+hq zn+ yoi6praph gives

  The slope of a velocity vers0 5vdi;x 0dp3tgj inij u4*ek2us time graph gives

  The area under a curvepd9h3+wu dhvfpq 4+:x q rv40j in an acceleration versus time graph gives

  The area under a curve in a ved ir z9:d1 exbc9:qr-jlocity versus time graph gives

  If the position versus time graph of an object is a horizontal lineyouvt s.66e+ x, the object i usv x+e6to6.ys

  If the position versus time graph of an object is a vertical line, the object isxt/ ot5q0o/hqqh/totx/5o 0 q

  If the velocity versus time graph of an *r c vp fy1k2:n*v0ujhobject is a horizontal line, the object is2rk10 unyf:vvj*hc*p

  If the velocity versus timec+mu,se l4ox( graph of an object is a straight line making an angle of 30 degrees with +sue4x (col,m the time axis, the object is

  An object moves 15.0 m nr d1( w3kqfd+horth and then 11.0 m south. Find both the distance traveled and the magnitude of the displacement vector.dfkqw1 r+d 3(h

  A boat can move at 30 km/h in still water 2wy-bpbs (s6r. How long will it take to move 12 km upstream in a r-r p6sb 2wsy(biver flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi quy;h68:d*- y,o nu uer-wgg2b :nepn= 1609 m)

  What must be your averag +arizi5 6, y,sfq4lj7 h,cbrqe speed in order to travel 350 km in 5.15 h?

  A runner ran the maratgd3m l+tumyp0vt79v4 hon (approximately 42.0 km) in 2 hours and 57 min. What is the average ut3 vp7 tydvlm4+gm90speed of the runner in m/s?

  A car travels 90 km/h. How long dobcu2,w/7vo a +wjjju. es it take for it to travel 400 km?

  A ly (light year) is the distance that light travels in one year. Theuptxp3x;d xshk5sfemg-++d 9z3-j*z a2ewp / speed of lig/ sz pdpz;eefp sxdka3hxutw32-*++j-mxg95ht 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 al( gap z.p-ju7,(a vrktong a straight road and you look to the side for 4.0 s, how far do you travel during this inattentive periodtjaz, 7a-kgpv u.(p(r ?

  If you run a complete loop around an outdoorp1 k/0 o msny4dw:t .x;7aoivxxs+iz9 track (400 m), in 100 s, your average 79poks xzawoxsx0y.i+ / 4dt;v:n1mivelocity is

  A polar bear starts at the North Pol1z.-o joxpdo9 e. It travels 1.0 km south, then 1.0 km east, then 1.0 k1o djzxp9.o -om 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 North Pole. I*ewj)xl* 445b jrehei t 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 ther *xb)54wi4e e*jhel j bear's average velocity?

  You are driving home on a weekgs b (dv7+u9 2r)d 4dhvkjk4acend from school at 55 mi/h for 110 miles. It then starts to snow and you s9rs)4k72dg4 kdu+ ( bdcavvjhlow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h andtbv 8 o e7hfm,n)fbm5z-xy(+ yg t1m.r 160 km at 100 km/h. What is the average speed of the motorist for this tri)ft.8t nv,ry 1(myfh+z o7gm5bbx e m-p?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What isaifa4 ze-+4 aol ,py8p her average sp4-yaoe az+ ilaf4p8p,eed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 25 ,/69qv)wro 0;b qzc-hrao ujw0 mi/h north for 750 mil bz- uqa, 0orwcw)oqr 9;vh/j6es. What is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last py k ook:9( p5fkqyr/*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 9 yoyrkfk kp*op5/(q: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 unifjb+ vghs7m0bsr4- v98v* g :xgtfor;normly and comes to a stop after 13 s. The car's average velocity during deceleration was 39 km/h-s hx; g9*j8rv0brv+7mf gs vg4not :b. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 pq(2ze jkug 7h:ah 8r:m/s, at the average rate of a (:prhu gqkz he8:27j$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerateshac rkz; 7g*v8 2ftzl- 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 fiucitoi:v )6f, t(x88rh6g p 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 spexr/5u18elxh8pfv 4hf eds up with a constant acceleration olhu vfr5/ e4x fphx818f $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 3.4 m/s experiences a constant accele zcusripb27e .ms01h7ration o r0.z7e s17 ish2upmbcf $2.8 \; m/s^2$. What is the cart's displacement during the first 7.7 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed of 33-:ph3t9 qqkl r6 m/s strikes a sandbag and penetrates3 :krt9-pql qh a distance of 70.83 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 cpz4d zu x4(rnr jq-7*sarrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is consruxjp 4s(z-*4r7qzd ntant, what is the length of the catapult?

  A car starting from rest moves wn- j(7o9b5bs8zgwgl c*e3t qh ith 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 distance of 2009 +q-7zd )of/kovxat f m. What is its average accelerativ7 -aoo+9z /ftkf)qdxon?

  An object starts from rest and underg1b ktp:ngv);/lxnuk , oes uniform acceleration. During the first second it travels 3.3 m. How far will it travel during the third s1) ,kglnn: u/ ;vxbptkecond?

  An object is moving in a straight line with constant acceleration. Initial l472*x(pldw,zyit qu ly it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during thisl,l4w xduy7z(ti2* pq time?

  A car starts from resn.vho*ln .m: yn yw*f/5y9 rae13oycxt and 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 drah3o ; j;-txju+oj4j by road 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 greewpgl ;9f y (6o9ju3yaqn, a car that has been waiting at the intersection jolf6 gypau3w 9qy9(;starts 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 (n4*yag mqvaphp*4q.ci3 m2hav;6k xof planet X where the acceleration due to gravit6v*4pi 3q*hma.gkc2xa (h apvmy;nq4 y 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+qtcpeb2b e6, surface of planet X whereb62,pqte cb+ e the 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 e-w b lkn/iext4+9i w43qmc2 i15 m/s on the surface of planet X where the acceleration due t-ncxq mi +9iwe2ib/l kt4e3w4o 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 surface ;un:z, xfwu*ildx h5 *of planet X where thn ; z** l:fuudh5xwxi,e acceleration due to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usual6)t-t6hrjj u+r+vr hkly greater than 0.10 s. If your friend holds a ruler between your+j6t-)h +k rurthr j6v fingers 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 is its v70vad.,eisidt s1yzd3f oj0 1elocity after 3.00 a ytsde dd.i70zj3o11 ,vfi0ss?

  A bullet shot straight up returns to its starting point in 4 s. Whn 83 -ypd).-aihisb lgat is the initial sngy.i) bah8 -dpl si-3peed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How ljt*nmplt3 /u8ong does it take to retur/l3*nt jum8p tn to its starting point?

  A ball is thrown downward from the1 :6gj2i udas *dhjuq: top of a building with an initial speed of 12 m/s. It strikes the ground after 2.7 s. How high is the builddsj2*1 d qh :u6iju:aging?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numeri6n22ltj( wkj. glb*wl cal value in the blanks). l62gjnwb*jlw l2kt(
(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 32.8yotngy8 ogkko /9*66qj xbz29 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 3pz,pf9bxf yta21ejn+n da )(4 ot3l:p flmc8is the velocity at t = 1.0 s?

  In Fig. below, what is the velocity at t = pq) lsf4k)t9l9chsjiw+;tj ( 2.5 s?

  In Fig. below, what is the velocity at t = 4.0 n gslwsr:+qsvc+t12tl:q / h/s?

  In Fig. below, what is the veloc-s5i 8x)v *x/s)ebp: u cypnqtity at t = 5.5 s?

  In Fig. below, what is the 7e pbq8cgjy- xm9)5p jcl-qy n (w+k-zaverage velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity9ci st xnvv9e yfo3b2. s*7l l0-tib9+h ;mmiw from 0 to 6.0 s?

  In Fig. below, what is thei8bvh1i4tw0 zz on+( q acceleration at 1.0 s?

  In Fig. below, what is the acceleration at 3.0soklz (y23p)p s?

  In Fig. below, what is the average acceleration 5--xch r enhn4-xf fe+from 0 to 5.0 s?

  In Fig. below, what is the average acceleraf r;ylh18h h(ytion from 0 to 8.0 s?

  In Fig. below, what is the displacemen ;s)bgpt)m op3t from 0 to 8.0 s?

Does a car speedometer measure speed, v i:eg )e)ybr (-or5boxelocity? {speed|velocity}

  An object can have a varying spe0-;t3ihk;gyl 4 cot cj5we*d 5sfvnce,j6 g0zed if its velocity is constant.

  The velocity of an object can be negative wup h:oi *tn9f t;xh0.ohen its acceleration is positive.

  If one object has a greater speed than a second object, the first must h-s*tazt4zf q6ave a greater az4f6zts aq-t*cceleration.

  Two cars emerge side by side from a tunnel. Car A is travel41nl0wzdognd tn0)t) 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 l hq p*6*-)ps pch,+ y99npuf0rlo ffqas its acceleration decreases.

  A baseball player hits a foul ball straight up into the a pr66gp)dwxk*ir. It leaves the bat with a speed ofpgxpwd6*6kr ) $120 \; km/h$. 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 ol/ 6gjni,k;z vbject speeds up, what is happening to its acceleration, how does it change if air frnji ,6klz;gv /iction is ignored?

  As a freely falling obhn2 b: pxys.u5ject speeds up, what is happening to its acceleration, how does it change if air f npx.h2b yu5s:riction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its origi+rtvp cxc;v 01nal position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this result be altevc;1 xp0cvt r+red?

  An object can have zervnmm ,-oa2jwn,jk5:xo velocity and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at the hfx7u em;67yr same time.

  An elevator moving from the second floor to the fifth n+-am m z sofpv+yq;v 8ryt r6;;uu .mioh3c12floor making no stops along the .foun;c mq a2t ; ypi-zsh68;v1momryuv3++rway has zero acceleration all the time.

  A rolling ball moves l2*o*y cd:eyz from $x_1=3.0 \mathrm{~cm}$ to $x_2=-7.9 \mathrm{~cm}$ during the time from $t_1=1.9 \mathrm{~s}$ to $t_2=6.0 \mathrm{~s}$. 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 $x_1=3.2 \mathrm{~cm}$ and at $t_2=3.3 \mathrm{~s}$ is at $x_2=7.5 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight completi tj4:l za;g089bxgtje laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 7.9 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, movinx0-tu,g0t1 8dzkury m8(rag s g 97 m away in 13.2 s. It then turns abruptly and galrt gy,(08m0-ukazx8 d1sru gt lops halfway back in 4.7 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 from 4yqxqhp/1 a:n7q9 k ;wp6pakh$12 \; m/s$ to $22 \; m/s$ in 4.1 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 from c0v o40hhnd.y3 qn (pikyg*-z $20 \; m/s$ to rest in a distance of 63 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a spee c819:d1: 5 zrn4m nooeydhrmkyyp9 s3d of $26 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.6 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially top snh2q6or ft0ge 2zfu+0 peed abou 20zfo+2 fg6euhtqrn0 t $10.6 \; m/s$ in the first 11.5 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 spe 0abb sxnv2e78ed of $17 \; m/s$ to rest in 4.12 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. Assuming z5(*dtax-bnxa dexxad-5 (tzb *nceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a trvh grszd6 0xzo,t87q3uck 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. Ai : y9ms88lq-axdua,x fter exactly 27.0 min, there are still 1100 m to go. Th9 s,u8 lay:i dxxqm-8ae runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$