Suppose that an object travels from one point in space tv:qxmp.b 3c-ro another. Make a comparison between the displacement and theqx3r .mcvb :p- distance traveled.

  When is the average velocity of an object equal to the instanrf xbdi1+,xq :taneous velocity?

  A new car manufacturer advertises that their car cajd dd-ca- )9)sm/ rg0 vldrm4vn go "from zero to sixty in 8 s". This is a dervm/-d dm rlsda-g) 0)4djv9cscription of

  An object moving in the +x ou4nk*8tmdy 6axis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the0hmnl5fhg,d.( j c8w5dodgjjk7i e0 k*x9 hg1 East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleration.wg e *,mgi1 jfd j7xdg0hoh9c 85kkhd0lj5(n.

  Suppose that a car traveling to the West (-x direction) begins to slow down+u9fu)x 3gaj1: i *igoe r1wrs as it approaches a traffic light. Make a statement concerning its acceleratsw 91 auoge1* jifr3+ gir):uxion.

  Suppose that an object is moving with a constant ve,i;wcb hdz,tm.f0f5 llocity. Make a statement concerning its accele,d,c mz ;f.btfhw 5li0ration.

  If the velocity of an object is zero, does it mean that the accele+p q6: gxp)dz7o+sucgration is zero? Suppo pcdgps7q+6o)+gxz: u rt your answer with an example.

  Can an object's velocity change directi:ugz/z0j z;5ilgx5. /ljdands 5nj/ non when its acceleration is constant? Support your answer withz 5j/ .dnjz:5a xnzdlj/5 n guls/;ig0 an example.

  Suppose that an object is moving with constant accelerati/n-zqbf j34 x olni7*r jdf m1:w-4qv7fzc0ma on. Make a statement concerning its motion with o - -1xz 4n3dwfnqfbj77/mm:jilfr40zcvaq *respect to time.

  Can an object have increasing speed while its acceleration is sc2s92- ubm)jzm k8 xh jc3u,hdecreasing? Support your answer with an exz-2h)83cux2msuhk9b j jcm, sample.

  Suppose a can, after an initial kick, moves up along a smooth hill oferuv+srolbm*jz:mo :(/q- qf.s d -f1 ice. Make a f1:/ . zsjqesqlrf+mm( duro- o* -b:vstatement concerning its acceleration.

  Under what condition is average velocity equal to the averacbd0 lba(v+p 4g8wgp; ge of the object's initld;c +v4g8b pwpgb(0a ial and final velocity?

  Objects A and B both start at rest. They both accelerate at the same raz6dp5y*yl0 -4hmzu jly, 3mfe4 w:s fnte. However, object A acceleray,3:j med54u6yn*mhflf- 4 wszp0 z yltes for twice the time as object B. What is the final speed of object A compared to that of object B?

  Objects A and B both start from rest. They bot/khz. ib9(v/ pao-t mxh accelerate at the same rate. However, object A accelerates for twice the time a9t i/-obmh ( /.zvkapxs object B. What is the distance traveled by object A compared to that of object B?

  When an object is released from rest and falp3 sejz/-an sm)(q y,rls in the absence of friction, which of the following is true concerning its jnyp-3(zm r)/,eqsa smotion?

  When an object is released from re2po otnm3 m+b9st and falls in the absence of friction, which obm2oo t9mpn +3f the following is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the velocity akj+9wop :ps.wnd the acceleration when the ball r.+9 p:wjowksp eaches the highest point.

  Suppose a ball is thrown straight up. What is its:uz ff mox j3a8d7wx*: acceleration just before it reaches3:*uxm8wf7: f zox adj its highest point?

  Suppose a ball is thrown straight up, reaches a maxim i9;jok7d.7;2h)wh kk sogdshum height, then falls to its initial height. Make a.7ossdoh) wkki9dj;h;h 7 kg 2 statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum hehbj :40+ udwduight, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is coming do jhb:dudw0+u4wn.

  Suppose a ball is thrown downward in the absence of air resistance. Make a statwn1 +f:py- ,vq4zvg )rffwmf1ement concerning its acwv,nyf qm1+4w vf:g-zf)r fp1celeration.

  Suppose a skydiver jumps from a high-flying plane. yfx)n0vsiz/ / l+b 9ag What is her acceleration when she she reaches terminalfl+) zy/ans09/ ixgbv velocity?

  A ball is thrown vertically upward with a speed v. An identical qbr 8wq p)e0m1second 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 high 8m1wqp )breq0er does the second ball go than the first ball?)

  Ball A is dropped from the top ofgc w xge-1r4i; a building. One second later, ball B is dropped from the same building. As time progresses, the distance b;w1crge- g4ix etween them

  Ball A is dropped from the top of a building. One second later, ba50iy :. h6cmjq4hfsy mll B is dropped from the same building. As time progresses, the dmm h4ysif5 6 :h.j0yqcifference in their speeds

  Two objects are thrown from the top of a tall buildn+2nkef2 hae7hy w;m d1e2d6wing. One is thrown up, and the other is thrown down, both with the same initial 2 mf yhd2+danh;ewne17e w26kspeed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. Ay-)k 4m4tys6tmv6v7: jprsdc i0j/lez n * m,n second brick is thrown straight down from the same building. They are released asi7,l/mt6dc:* se0jvjyn4vmrz4y6 k)tn m p-t the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with const2ri3d*t j, :i xeprk+oant non-zero velocity in the +x axis. The position rkr ,p i*t3oe+jd:xi2 versus time graph of this object is

  An object is moving with constant non-pz fak7z)n6h: zero acceleration in the +x axis. The position versus time z 6zkhp: 7fna)graph of this object is

  An object is moving wy11zqz7hx ( q(ul kkq*m: uo6mvdo3 f)ith constant non-zero velocity in the +x axis. The velocity versus time graph *1f(mhqy qql z)zxk(3 61ov7dmu:ukoof this object is

  An object is moving with constant non-zero acceleration in the +x axis.q+:bdqua6r f 3xvu4l8hm4a 6k The velocity versus time graph of this obj+6xd q3 rh: b kuf4a68m4vlqauect is

  The slope of a position vertswxu :r v,mr ,t2*w6rsus time graph gives

  The slope of a velocity versus timexz bknc;2- h.f- hlqg2 graph gives

  The area under a curve in an acceleratio lj4k3gr353 +m sbegqwn versus time graph gives

  The area under a curve in a velocity versus time d3(lpdi 2m,gbiz, m2l graph gives

  If the position versus time graph of an object is a horizontal line,5s;mivghtq tep )2h; ) the object ish;eh))tvq 2i ;pt mgs5

  If the position versus time graph of an object is a vertical line, the objxa 4r7l zfyta. 2ny p4t7-et*wect is w yytz. 7a-*x4t4 f7r2elpatn

  If the velocity versus time graph of 9ce1 /w,48whppzb bs pan object is a horizontal line, the object isb/9cwsbhpp148 p e z,w

  If the velocity versus time graph of an object iuiqnt aw4qh k(an /x*-j* lw;;s a straight line making an angle of 30 degrees with the time axis, the obq akq*ltj;n/4wuna -w i*h( ;xject is

  An object moves 15.0 m north and then 11.0 m sou4y oxm.)7bvkz-i f, +tqof ,cfth. Find both the distance traveled and the magnitude of the displacembcm i,-v k+f)y of7txo,z .fq4ent vector.

  A boat can move at 30 km/h in still water. How long will it take 0qk+) lfz p 4nye,x)vrto move 12 km upf4+ )0lz,)rnk qxpevystream in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi *t-l3s,ihsdw ). cjbf= 1609 m)

  What must be your average speed in order 2,apn rx,zodhp.+h6c to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min. What i2*; t k/ wbf5wyohqn2cs the awohwc* t b;2/fk52qn yverage speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to travelg j 5 .f6rizfr- cgdm0, (pf.5fi0odka 400 km?

  A ly (light year) is the z;c7 jsk qaxs1t9f 0w+distance that light travels in one year. The speed of light is 91a xz+s7fwcskjq0 t;$3.00 \times 10^8 \; m/s$. 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 to ther7jqdz*z o/ ;lz sw8r0 side for 4.0 s, o qj7 lsr ;zd/r0z8z*whow far do you travel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, your avera gl4sk9ejfk)a d)hr46ge velocity9skgjhlkfe da ))46 4r is

  A polar bear starts aterk7v rggv/.:w q 9a(f the North 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 average speed?gr 9.q(:7 e/frvak gvw

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km t*kr ,ykj:r59,kvfb x east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. Whattxkf,jk: r9,r5by k*v was the bear's average velocity?

  You are driving home on a weekend from school at 55 mi/h for 1z9x(d90g t t9echcwk :10 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minut9(0etxc9t9hk gzwcd : es. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What )eknc +2e;w.fd rh2nbis the average speed of the motorist for this tre.fc)e; b2knr nwh+2dip?

  A motorist travels for 3.0 h ato1g4zwpr( )d d 80 km/h and 2.0 h at 100 km/h. What is her average speed for the trrddpo)4 wz1(g ip?

  An airplane travels at 300 mi/h south for aw7 enq/ ze7r7.z;ch:xlb2 pv2.00 h and then at 250 mi/h north for 750 miles. What is the average speed for the trepz7 abcwvzq7e 2l /x.n7;h:rip?

  In a 400-m relay race the anchorman (the person who runs the last 100h jfod wp.ftx2 eo3,-- 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 whepd,2h.exf3 jo-fwt-on 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 14 s. The car's average -y4ef,ry oad ,u7q1ztvztdqyof ,euyr-a 7, 14elocity during deceleration was 42 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 the average ratheu/,d1fr a0e uxss 84e of h/,du 4e ea1ss rfux08$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 ke.hkur gqz60:wt0 j m6m/h accelerates 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 ac o*.x3u ydvx)yu:mv8f celerates 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.1wqu wyluy e70oxm dixt52i(8 nk56t/s for 10 s. It then speeds up with a constant acceleration ofu557 myi(wqld2u1ni 6ex.y0kt o xwt8 $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 4.2 m/s experiences a t*vdn7 x hz:7cconstant acceleration of *vtzx7hcn 7:d $1.8 \; m/s^2$. What is the cart's displacement during the first 6.3 s of its motion?

  A bullet moving horizontally to the right (+x direuza5(7nq 9 4pm3ugl0ttkm;uv ction) with a speed of 436 m/s strikes a sandbag and penetrates a distance of 97 l;atu9 ntm 5( vugzmpuq30k43.72 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;uf*t l c4i h5jl0yr2o carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming thejyl fho u ;0t*5i4rc2l acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with constant acceleration x+;x m3i;chi 0z i*jdvof $2.0 \; m/s^2$ 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 ir) wx 6/xvu1rmn a distance of 200 m. What is its average acce1wx) 6rmx ru/vleration?

  An object starts from rest and undergoes uniform ac3)f+y 9f hejt9cazi dasn6c.9 celeration. During the first second it travels 8.2 m..9d e ct3zay9n 9 fisc)a6+hjf How far will it travel during the third second?

  An object is moving in a straight line with consj/bs nkd0yi/ lhi((.ltant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s d/0/(h.(ibslijl nky . How far does it move during this time?

  A car starts from rest and accelerates unbw se)+ ./km4fpr2wdciformly 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 decelerate at abo1zdp:5 r c5rbfi,+ggcut $5.0 \; m/s^2$ 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 wn605yxjn s;0x1jl yjjaiting at the intersection starts ahead with a constasl0 5xnyj;jj 6j1y0xnnt 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 alc7-tzp zr 6u7 speed of 12 m/s on the surface of planet X where the acceleration due t6c zp7r-7zluto 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 play4x -lts hq)2qxe(d o+net X where 4d +-(2s eyhqtoqx)x lthe 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 witi7kd 7xnlml62 h a speed of 15 m/s on the surface of planet X where the acceleration due to gravity is dm li 77k2nxl6$2.5 \; m/s^2$. How long does it take for the object to return to where it is thrown?

  An object is thrown upward with a sru 2,y z) y +f+yw*qbd;woxw8kpeed of 14 m/s on the surface of planet X where the accelerationy,qbwdy;+ x)*uz y8w kr+wo2 f 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 greatnr+bl4(e fqor4v;s k 0er than 0.10 s. If your friend holds a ruler between your fingers anr4nrqve;kbs+ lf4 (o0d 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 2/p 1cp/yi;q)bgj a :icn/ sfa19.6 m/s. What is its velocity after 3.00ija)cb incq ;:psayfp2//g 1/ s?

  A bullet shot straighzggmq2, e(fvg18 ,y wzt up returns to its starting point in 19 s. What is the initial speed of the buy82gw,gqzg(fz v m1e, llet?

  A ball is thrown straightgow e1go2t, nu why6(4 up with a speed of 36.0 m/s. How long does it take to return to its starting pointoye4 og 6 ugh2,1w(twn?

  A ball is thrown downward from the top of a building with an init 3 nt7y; (-sz( hfl0dzfmzp(mkial speed of 15 m/s. p fk((;tzs (f-73nylm0zhmz d It strikes the ground after 7.7 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fuy s-mn1;8u spill in numerical value in t s8;pnum-us 1yhe 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 45.4 m/s. (tdfv+0orh (6;m)in9xe t 2 nicuse $g=10 \; m/s^2$, 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 3 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 14 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 14.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what ik(4vx)hi7 mykbzb y m92 ga0.gs the velocity at t = 1.0 s?

  In Fig. below, what is ter gej 2piqj6.zyu6q+vn) 05 phe velocity at t = 2.5 s?

  In Fig. below, what is the velocity at ;f+yl7q0v8u2z)mk c 1p hdoajt = 4.0 s?

  In Fig. below, what is the velocity) omf: 8nd,d5l v11c4 llmbfax at t = 5.5 s?

  In Fig. below, what is the average velocity from ;/,pqhi,g. d;gomka z 0 to 4.0 s?

  In Fig. below, what is the average velocity from 09 gddja8 o/r6 yto2u8y to 6.0 s?

  In Fig. below, what is thei )83ueaiv4ju 8kwb v; acceleration at 1.0 s?

  In Fig. below, what is the acceleratikc /a lqcj7dpc2x *3n:on at 3.0 s?

  In Fig. below, what is the average acceleration from 0 to 5.0 uxi-bfh lr1;o8ow.l8 s?

  In Fig. below, what is the av1 wmju9hjn pf n*1ke1+erage acceleration from 0 to 8.0 s?

  In Fig. below, what is the displ * fms q/7-91sqawfqykacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|velocity}r13nsy:ecu;s8 y-,r sz 0+lsco8f vak

  An object can have a varying bxy34kn: ycf.p o:y6y speed if its velocity is constant.

  The velocity of an object can be negative when its acceleration is poxvz88 zos w i:q6u3w9jsitive.

  If one object has a greater speed than a second/e;z+fx1zoya1p( c hq object, the first must have a greater ac; /yo+z1 fep xc1qhaz(celeration.

  Two cars emerge siderh 2 hwj:rb98i;:g gbq by side from 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 increasing in speed as iz.x smte *m62xts acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It leavj.ggd k3k 7fs.es the bat wgfkj k..gs37 dith 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 isgrxi 67qet+n0 happening to its acceleration, how does it changgqx670nt+ e ire if air friction is ignored?

  As a freely falling object speeds up, what is happenba ftkg.621en)t;t- go qzs( uing to its acceleration, how does it change if air fricti 2f(tk n 16- t;q.aegto)guzbson CAN NOT be ignored?

  An object that is thrown vertically upward will return to it+ k8l;ozz9ms*;idz 4y n1p lgvs original position with the samsn+894y *lzvlpo;k z1gzm id;e speed as it 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 thel-f6 )(9ca n+brh dgis same time.

  An object can have nonzero velocithw ) gfn vp+/(q9thmd8y and zero acceleration at the same time.

  An elevator moving from the second floor to the fifth floypw 2 :q+pqix1dv(a d atg)6/yor making no stops along the way has zero acceleration all th+w x2yqap/1yidgp tv):qad6(e time.

  A rolling ball moves fromnqci;754 +rhoo mwq 7 z-d5dpu $x_1=2.2 \mathrm{~cm}$ to $x_2=-8.6 \mathrm{~cm}$ during the time from $t_1=1.1 \mathrm{~s}$ to $t_2=5.0 \mathrm{~s}$. 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 $x_1=2.3 \mathrm{~cm}$ and at $t_2=4.1 \mathrm{~s}$ is at $x_2=7.8 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quul9+q/6en ybk arter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.0 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 95 m ,o)i,y 2qb p8 1b:ptvcpvv:b )wh/udxaway in 13.1 s. It then turns abruptly and gallops halfway back in 4.6 s. Calculate (a) its averagvp ,oh2 b, dqcub:1 bxi:pv/)w8typv )e 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 fromxt, 7kldar - )q)lh49 s1rjzmblt6w3u $12 \; m/s$ to $24 \; m/s$ in 4.4 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 froqv9uon/( e j*vou7z,5 xa j,fom $21 \; m/s$ to rest in a distance of 66 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a cbq 0n-epvo)/4ese b)speed of $30 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.4 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentiauxxz5 7)ir 3 9heyhfp,y9.g9oj (fioblly top speed about9. z, y 9iihfx gh)urofo9y 3x(j57ebp $10.5 \; m/s$ in the first 12.5 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 unifwp0spx(op0,huo vh(n xi .+s (ormly from a speed of $18 \; m/s$ to rest in 5.18 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid margc4a7/*vog *9krzjvn ks 92 m long on the highway. Assuming a deceleration of j/9*vk7r* 4gonaz cgv $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goingxatox9 ygvufs.+3a1 z xzhvdt;j 1c g::s,u *: $25 \; m/s$ 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 completer-ht:o, lmucu;k b. 9k the 10,000-m run in less than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The run.kohcu,r:-t k ulb m9;ner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$