Suppose that an object tj0)hmc 8hc8 hw/eaok5ravels from one point in space to another. Make a comparison between 0amhj chk5 /8c) eohw8the displacement and the distance traveled.

  When is the average velocity of an object eqp+fk+o x*xrx1hzs :o( ual to the instantaneous velocity?

  A new car manufacturer advertises that their cpxu2w: tzg cleo 5-:hr+)8sen30vxswar can go "from zero to sixty in 8 s". Thi gh0 xe:u3z) e+v pw2oscswxr58n:lt-s is a description of

  An object moving in the +x axis experiences an acceleratiox):ni-a zaf2v n of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x directbci e 909t2rewion) begins to slow down as it approaches a traffic light. Make a statement concerni90w eirbt9e2cng its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slow d. jypeq7 5st/zown as it approaches a traffic light. Make a statem7/qyzj 5t.epsent concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make9 lyj/b- ;foph a statement conc/fb j-;oy9hl perning its acceleration.

  If the velocity of an object is zero, does it mean that the accelehx,o;8k70 7c0e laknmrk fw5mration is zero? 8 m x ok70awmlfk5 0r,n;ce7khSupport your answer with an example.

  Can an object's velocity change direction whe w7j; 6j4vf)wmtou5fpn its acceleration is constant? Support your answer with af;mvj5 wjou 4ptf7)6wn example.

  Suppose that an object is moving with constant acceleration. M rlg5d,r6b i1 imd:p,sake a statement concerird g1b,pm6d,r ls :i5ning its motion with respect to time.

  Can an object have increasing speed whtz23 mnv tk/w( jow4t/ile its acceleration is decreasing? Support your answer wi 2z4k ntw/jom( t3v/wtth an example.

  Suppose a can, after an initial kick, moves up along a smoothl-1e rp,un2xt hill of ice. Make a statement conl1 rp -x2,uetncerning its acceleration.

  Under what condition7xp u. psqvqbo81,nm1 is average velocity equal to the average of the object's inxp1.qq,ns1o pu vbm7 8itial and final velocity?

  Objects A and B both start at rest. They both accelerate at the same rate. Ho4;:dj sk* y n+ m*y5djm5i:qm 0qujpugwever, object A accelerates for twice the time as object B. What is the final speed of object A compared to that of object sm+iq 5 mg4j:;jd uyjp5 nm0yk*:duq*B?

  Objects A and B both st*xaym0arq h3bk6ll b ce4++ -bart from rest. They both accelerate at the same rate. However, object A accelerates for twice the time as objec yh3+lb+aqb-r 0a 6belmx*c4kt B. What is the distance traveled by object A compared to that of object B?

  When an object is released from rest and falls;d0bt(x8r nx nmwzwm+(f)* sz in the absence of friction, which of the following is true cm0w )( (fz8nbxz rt m*n+xw;dsoncerning its motion?

  When an object is released from rest and fallswtzy2* n9d 8vt in the absence of friction, which of the following is true2vtwzd 9*y8 tn concerning its motion?

  Suppose a ball is thrown straight up.5dfkei-kt1l2f g)(n iqv;z 0h/mj ,vy Make a statement about the velocity and the acceleration whe fdieqt;-m0(h ) kjl/n, vkif2g1zy5vn the ball reaches the highest point.

  Suppose a ball is thrown straight up. What ij o ;nih.x ,tc+g,5bk1p mr7vvp/ fqf6s its acceleration just before it reag ,v1+otq bpj .hipfmn5v76/cr,;xfkches its highest point?

  Suppose a ball is thrown straight up, reaches a maxiy 7io 7abq 9-l/yg;jlzmum height, then falls to its initial height. Make a statement about the dir9a-i/l7yb jzgq l7;o yection of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls to ige()gd khp)c (ts initial height. Make a statement about the direction of the velocit() pg(gkhecd)y and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absetm+q*2 /apewj5/r ldr nce of air resistance. Make a statement concerning its acceletq*5m+j2r/rp a l/dw eration.

  Suppose a skydiver jumps from a high-flyvghx j;u8r)/vyh7r 6 king plane. What is her acceleration when she she r/hrkx; 7yv)vg 6huj8reaches terminal velocity?

  A ball is thrown vertically upward with a sp(k2,8lyl 8nut r:x1k lw/tcvdeed v. An identical second 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 higher does the second ball go than wkydc:8/,x 8(2tktuln l1lrvthe first ball?)

  Ball A is dropped from the top of a building. One second later, ball B isxcp1cz-a::y l dropped from the same b capzy1-xc:l :uilding. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One ct/5o4(4km; p. . ngwb* clapc sthjr.second later, ball B is dropped from the .b ccr n..4lts ct5wp;h *jamog/p4k( same building. As time progresses, the difference in their speeds

  Two objects are thrown from the top q-/r 9mw/n cug0m5 uylof a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What arr- qy u0lnmg/ m/59ucwe their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick is t a3nrlq+j j/pu7i6jm9 8nq6 ybj,,irjhrown straight down from the same ip3j6q+6yuj 8n/ qji rln,9majrj,7bbuilding. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving gwj.* w :bsxeq29dbv;with constant non-zero velocity in the +x axis. The position 2b*qswg;ev9dbx:. j wversus time graph of this object is

  An object is moving with constant non-zero acceleration ix):k ivibwb5 xx65 g)kn the +x axis. The position v:g)xx )i5bw k k5vxbi6ersus time graph of this object is

  An object is moving with constant non-zero velocity inrz: d 2i,/oi olb77ncm the +x axis. The velocity versus time graph of thimc7 brdo,z in7 l/:i2os object is

  An object is moving with constant non-zero acceleration in )i;cdlr7v7+q j eso ,hthe +x axis. The velocre o)l;hvsj7 i, q+c7dity versus time graph of this object is

  The slope of a position versus time graphf 98urq ey(j*f gives

  The slope of a velocity versus tk+vh0jog ldlcwd0tg8 y70r* tv4-lh 6ime graph gives

  The area under a curve in an acxht(h x n4pu1 c9:a9quceleration versus time graph gives

  The area under a curve in a velocity vf emic:vp6,jyhj;4j :ersus time graph gives

  If the position versus time graph of an objezs/ eunh/.;c.vx hh5/u7v rnh . 4ibcsct is a horizontal line, the object i.hrs;hhh7n zc/vusv n xi c./5e./4bus

  If the position versus time graph of antpge; *bsyfp: gnt3 )3 object is a vertical line, the object istfb: 3s)p3g p;etyn* g

  If the velocity versus time graph of an obpv6:/y+a* ,chwtsq xe ject is a horizontal line, the object isqvth s:*cy+ap/e,xw6

  If the velocity versus time graph of an object is a straight line makkdrqbh3(/-8ji7 i3 j.hjahfm ing an angle of 30 degrees with the time axis, the object is/j-.rbihd8a q 7ihm(33 hjj fk

  An object moves 15.0 m north and then 11.0 m south. Find both thei..6i kw qqy8 7m:slne distance traveled and the magnieqlkqyw: i ..m6 n8si7tude of the displacement vector.

  A boat can move at 30 km/h in still water. How long will il k*xs3yvt9c;f5z lz 9 6fdd0ot take to move 12 km upsx9d o;td cl*zkzs03yl5ffv 69tream in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mm zrmj a;x2*fbo2s9w)i = 1609 m)

  What must be your average speed in order to travel 350 km in20+b)dy 1io:ya vhvv a 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 20i b2om,raid + hours and 57 min. What is the average sped20m,io+ria bed of the runner in m/s?

  A car travels 90 km/h. How long does it :padhb r;hae5276sib take for it to travel 400 km?

  A ly (light year) is the distance that light travels in one year.s7 nn-(.a ifoe The speed of light isf.oe( san n7i- $3.00 \times 10^8 \; m/s$. 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 robde) 9xoti,wd*j n96oad and you look to the side for 4.0 s, how far do you travel during this inattentive periodontd9*ojb e69 ,wx)id?

  If you run a complete loop around an outdoor track (400 m), iy 0izu ,7n:idxn 100 s, your average velocitiyiu7,n 0dx: zy is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.n 3vpfj vim;i0b v3/ e(yqw87r0 km east, then 1.0 km north, then 1.0 km west to return to its st b370q3m (iyev/nfp;vrw 8jivarting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. e:9hl*k4 jsnq 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 poi4sel *:9qknjhnt. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on d(sr 094koh p e9xr0qva weekend from school at 55 mi/h for 110 miles. It then starts to snowqp ev00d(49 ros9rk xh and you slow 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 and 160 km at 100 km/h. What is thef5i7upm9igsjv pz/, r .w 2j1z average spe 2gj/ w9jfzur7pv,iis 1pmz. 5ed of 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 p 5p ovda//f1zwzm-+pis her average/ za fo+m -vp5/pzpd1w speed for the trip?

  An airplane travels at 300 mi/h south for dw67ywr:ef v 02.00 h and then at 250 mi/h north for 750 miles. What is the average spww70ed fvy:r6 eed for the trip?

  In a 400-m relay race the anchorman 4csap-( /jbj /s ,y-dom9cpnv(the person who runs the last 100 m) for team A can run 100 m in 9.8 sbnpd-y s/-94vja/ ,mcpco ( js. 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 come n(bgh cg*,/a5: xmxsls to a stop after 10 s. The car's average velocity dux glnsb(x5/,ah :gcm* ring deceleration was 48 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to(w*ez d+z+wt;y+r yx93dy i9 pu:gsoo 160 m/s, at the average rate of *(d:ywt3pdyyoi9+ zg+; so r + 9zxwue$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rate opv (,hml/ *kchf $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from rest and accelerates atk u9,j1q9 t0,+ggnm fqu nqw7n $4.0 \; m/s^2$ 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 tbimnu/*s o)b :uj e*6ahen speeds up with a constant acceleration a)n b is6u mju:**boe/of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial vel+a0c 3j9u06 h92qefrwplma p yocity of 4.5 m/s experiences a constant acceleration off3 6a0 y0qcpjm+w9uph l2are9 $4.4 \; m/s^2$. What is the cart's displacement during the first 4.8 s of its motion?

  A bullet moving horizo2uluimxy6u4o n 50d/intally to the right (+x direction) with a speed of 558 m/s strikes a sandmui2x uil /n6 o5u40ydbag and penetrates a distance of 34.10 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 carr0;3h zv:ctvp qier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the accelepcvq z0;vt3h:ration is constant, what is the length of the catapult?

  A car starting from rest moves with const6wa) tds:jx) xbxux ;/lizu4)ant 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/i x 3d).o8hpsls in a distance of 200 m. What is its average acceleration?.hd8p 3i oxl)s

  An object starts from rest and undergoes uniform acceleration. During the firstyeumw+7b rola9o* - 1n second it travels 9.5 m. How far will it travel during the third secondyul bmw ron9oe+ -*71a?

  An object is moving in a straight line with constant accel501lur8s yh mn+gkt16nw, lbberation. Initially it s1 8rn+1 0lbnmwlyb5ukg ht,6is traveling at 16 m/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 acceleratl04 thpwt2b z;es 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 decelerate at aborb zrm; w8g+; q+tbq9fut $5.0 \; m/s^2$ 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 waiting at the ijhod )w 92u ziviltl-) bj;u+3ntersection starts ahead with a constant acceleration of o)huu tw+-;)v29 dbljzi i jl3$2.00 \; m/s^2$. 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 sp.gcvi .)*jiiqh z0lx d5 t4yi:eed of 12 m/s on the surface of planet X wherhi.c v0)j gi.yqtl4i:d* iz 5xe the acceleration 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/fpl;+;.bpqmgsp n c cq.hxkym(8 -v;*s on the surface of planet X where the acceleration dqsl 8..p-qp;c;+ckyvbmg;fhp (mn* x ue 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 upwardqpbgjofz t:6,p8vz9 u, y+dy2 with a speed of 15 m/s on the surface of planet X where the acceleration due to gravi+:,uvp9 ,gy26zq yz 8fbd ptojty 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 f 8 zgp aom4*4w kjfx2tp6dw:9a speed of 14 m/s on the surface of planet X where the acceler8 gwwtz j6pa *2:p k4o9md4xffation 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 t8bx f jsm3en.*gnoc*a)z9my4/icf y 2han 0.10 s. If your friend holds a ruler betwe.s3g z) 28fnfe49ycjnm*iyb m/ ca*ox en your 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 velocitp0+kchmf 8 fp/y after 3.00 s fck/pm+0fph 8?

  A bullet shot straight up returns to its starting point in 13 s.6 ;s 71nykcjpv- zo6hg What is the initial spe;nhsc6j6pv- zy 7k1 goed of the bullet?

  A ball is thrown straight up 3j bqpl9yc,(dwith a speed of 36.0 m/s. How long does it take to return to itc9dj ly(3b,qp s starting point?

  A ball is thrown downward from the top of a building with an initial speed of 8 /u7-gagq 3q q+bp zgf:m/s. It strikes the ground after 6.6 s. How high is thq zug-qg3q7/f ga:b+pe building?

  A ball is thrown straight up witc(,o-wo9 rrh mh a speed of 30 m/s. (only fill in numerical value o r,(rwmco9-h 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 into the air with a s5amkjceug4 58q8; uhppeed of 21.3 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 10 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 10.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t =f eohqua/)c;k:jh1f ( 1.0 s?

  In Fig. below, what is the velocity at t l6xu(,k9 e0h,( pva ocw ub7pd= 2.5 s?

  In Fig. below, what is the velocity aul-r*ar.vlf h.eh 7 n1nnl q 2;-zowd+t t = 4.0 s?

  In Fig. below, what is the velocity at t = 5.5,(dx sk86 bhk n2)v bw;ume)hc s?

  In Fig. below, what is the averag;l5oc -h5;z-azk7jkkk nrarn7e*w t/e velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 to 6.0 s ibfoqb.,x17z?

  In Fig. below, what is the ac:0 3y1bximubp9.ef)s ppq h 6eceleration at 1.0 s?

  In Fig. below, what iu0d8qlk9al zw(-)obm- a us1 ks the acceleration at 3.0 s?

  In Fig. below, what is the average acceleration jql jbkpk 9-0 3r);hgjfrom 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 3j0 w +0,t.lof kb ymfzwbyk:-hz+ mp(0 to 8.0 s?

  In Fig. below, what is the displacement from 0 to 8.0i+4d f*qlpvvf,y6 d i: s?

Does a car speedometer measure speed, velo 7; itmcyo5o)ncity? {speed|velocity}

  An object can have a varying speed if its velocity is constantxu7)o i9r sdwa.wg,5rf i,g-kp) y2 em.

  The velocity of an object can be negative m y -sw2r0dt;x gvl4i2when its acceleration is positive.

  If one object has a greatg4jnwmkk*to jv(.; x .er speed than a second object, the first must have a greater accelerat4v om.kn.kx j*j tw(;gion.

  Two cars emerge side by side from a tunnel. Car A is traveling with a spe lo 5exm3e/mz8ed 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 increah+i6ki k mu /j*;4pzi)ucw4htsing in speed as its acceleration decreases.

  A baseball player hits a foul ball straiqzpdla/2(58xb 4 7hh s hqb9ezght up into the air. It leaves the bat with a9zxeha58qz74/b2 ld hbps (qh 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 is happening to its acceleration, howwd/6kco rzm fp/4s1 ia5kfa5.am,n5y does it change if si154aw 5f oapa5zymncfr/ dk/6mk., air friction is ignored?

  As a freely falling object speeds up, wha s9/f+d( aicpdhpq6f1 t is happening to its acceleration, how does it change if aird+a /1sd6hcf( fi p9qp friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its original pj7hlh5q5c x8 br+z x1zosition wit+ 8bxz5hc jrl17qxhz5 h the same 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 ad a93z/ 3lfbnat the same time.

  An object can have nonzero velocity and zero acceleration at thds.o 2mqcsre;is7k7 p: -s8p le same time.

  An elevator moving from the second floor tk.3sijja2hpwj o;7) bo the fifth floor making no stops along the way has zero acceleration all .aj wpho7j;k2i3j b)sthe time.

  A rolling ball moves froms sds jn842gf+u+gz/s $x_1=3.2 \mathrm{~cm}$ to $x_2=-4.5 \mathrm{~cm}$ during the time from $t_1=1.9 \mathrm{~s}$ 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 $t_1=-3.0 \mathrm{~s}$ is at $x_1=2.6 \mathrm{~cm}$ and at $t_2=3.3 \mathrm{~s}$ is at $x_2=8.4 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps aroundid/0z w3 8w+7nx y -ctjdxcfe- a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 12.0 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, t0g1l:asgp3 + (tzu/ds n d5efmoving 90 m away in 12.1 s. It then turns abruptly and gallops halfway back in 4.5 s. Calculate (a) its avera5dl+ a f 1(g:s3updtgnsezt 0/ge 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 fr9;9sn+aa6a ne y:jttaom $12 \; m/s$ to $24 \; m/s$ 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 frokqzrf1c+nf x4. *pfmz --gem*m $20 \; m/s$ to rest in a distance of 79 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach ayyp:8 3,vjhmdl on6*l 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 blocks to ess5b-5q qcz+oc/ef:nihentially top speed about:coeq/n b +5ziq 5fc-h $10.7 \; m/s$ in the first 14.0 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 speed of 6(y bu 8nqhuinh(x:5g:nb*qi$18 \; m/s$ to rest in 5.19 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a s o5 b,v3vm .y6em6ibwcar leaves skid marks 92 m long on the highway. Assuming a decelerob 6yvi6m3wm .,s 5ebvation of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck going o2m5up tu6 wnbpm*qc 0+x4z+o$25 \; m/s$ 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 coyp liqy4fos -06 nax6(mplete the 10,000-m run in less than 30.0 min. After exactly 27.0 min, there are stiny0-liq6o4fyxas6p ( ll 1100 m to go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$