Suppose that an object travels from on m2t r/-jzfnb6 h fe7-kap)3lte point in space to another. Make a comparison between the displace h2rfe- l/)fk 6-tbjpnz 7tm3ament and the distance traveled.

  When is the average velocity of an object equal to the instan-z b32ua);gwvlljh *t7mcp z-taneous velocity?

  A new car manufacturer advertises that their car ca 6h4gxb(dv* pln go "from zero to sixty in 8ph lb 4vd(6x*g s". This is a description of

  An object moving in the +x )thvwc86ofvdk66h n/ axis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car travelint1mm zwvxm;/jh+0ka0bo:3 ub g to the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement cono1 wmm3xu/bh0:ak ;tmzvbj+0 cerning its acceleration.

  Suppose that a car traveling to the West (-x dir26n9swb*s c tu8whq 9jection) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleran9uh2 6tj *w wcs9sb8qtion.

  Suppose that an object is moving with a constant velocity. Make a stabwvvonl)(b ) /tement concerning itn()b b/lvo vw)s acceleration.

  If the velocity of an object is zero, does it mean that the acceleration4 y 1,ca7r h-cogl9rg:avcif- is zero? Support your answer with a 9gry laov:c a1f4c-rch-gi,7n example.

  Can an object's velocity change direction when its accelbe4bt9x* rs(f eration is constant? Support yex4s*(9rtbb f our answer with an example.

  Suppose that an object is moving with constant acceleration. Make a stateme l ozxwbpv+x9y+emjl):.4: lynt concerning its motion withv:+le:.+loz b xx9ymly wj 4)p respect to time.

  Can an object have increasing speed while its acceleration is decrea+ux0wmz7* ylnsing? Support your answer 70x *wnulmz+ ywith an example.

  Suppose a can, after an initial kick, movesac wb 2z7x4rk1 up along a smooth hill of ice. Make a statem bxzr4c 21w7akent concerning its acceleration.

  Under what condition is average veloci, 8bpvnh zt8q l0eyrqk 9yfs0 2m;fd+6ty equal to the average of the object's initial anyf;n2mdz leb6 qr 8vkf ts 9p+0yh0,q8d final velocity?

  Objects A and B both start at rest. Thel4 nqmk j9l2xcoj d.1)f.vkv3y both accelerate at the same rate. However, object kmxl.1j9ljq)42fdo .v 3c kvnA accelerates 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 reuac 4t :v)g z7qv+i;wlst. They both accelerate at the same rate. However, objec4tv; qu7)vlg +iwa:zc t A accelerates for twice the time as object B. What is the distance traveled by object A compared to that of object B?

  When an object is released from rest and falls in the abse i+ 2/ hhjs,lj8 lc)5lzyzcx6mnce of friction, which of the following iz/j 62myc5hjxs,hi8+ llczl )s true concerning its motion?

  When an object is released from rest and fath 16 +jy5m6h(qlm tjlj5yv-y j7-qwklls in the absence of friction, which of the following is true c qyyvhljy-+qkm(jl6j 17t5tj5 6m-hwoncerning its motion?

  Suppose a ball is thrown straight up. Make a statement a-cfegzp: br70 bout the velocity and the acceleration when the ball reac0:- b7g pcfezrhes the highest point.

  Suppose a ball is thrown straight xe)t+z r9,svt up. What is its acceleration just before it reaches its hi sr9t)z,x+et vghest point?

  Suppose a ball is thrown straight up, reaches a maximum heigk/v:,w m.6fna qlcw8oht, then falls to its initi nw/a.f ko8:q6cvl,mwal height. 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 mavww7bj-8r nd ,ximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the bal 8rwbj,dn-v7wl is coming down.

  Suppose a ball is thrown do t6k;apjb:(6pu et g *j61bl kb(pyle.wnward in the absence of air resistance. Make a statement cokjg .;leb6l6ebtpyp: pkaj6( 1*b ( tuncerning its acceleration.

  Suppose a skydiver jumps frolmder1rc a7 ds4nwku7 7:a3 u.m a high-flying plane. What is her acceleration when she she reaches terminal velocisr7 43udlaakreuwm:1 cn 77 .dty?

  A ball is thrown vertically upward with a speed v. Anz , 6wn(h yfo01oxq6gmj3 /gpg identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio ofy,wx (zgq f61 g0ohj36o mngp/ the 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 a building. One second later, qo-yb ;j+)hyfball B is dropped from the same building. As time progresses, the distance between the-;fjbo+yq hy )m

  Ball A is dropped from the top of a building. One second later,n:j t.t)* eimw1ue/cq ball B is dropped from the same buildin1j)etc:./ m *unw qetig. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is thro69swmiyu .r wcv+hu,h9zqi90uxnz * 9 wn up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit the street?r6u9 hc+ 9.uz9zhum0i*wqwiy 9xv,n s

  A brick is dropped from the top of a building. A xbps3 h .(h5opsecond brick is thrown straight down from the same building. They aro.b5p(ph3 sx he released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant j 2s. 3xakg9xvnon-zero velocity in the +x axis. The position versus time g 932xskaj.xgv raph of this object is

  An object is moving with n9,oh ar8.l eqx0ya6j)h ni 9rconstant non-zero acceleration in the +x axis. The positio,y6r rxqo0n )h.a h8a99ejnl in versus time graph of this object is

  An object is moving wi,by2 pwopnn,j drw,f.z b4q ,3th constant non-zero velocity in the +x axis. The velocity versus time graph of thi b2 fq po,bzndwr,,y. nw,34jps object is

  An object is moving with constant non-zero acceleration in the +x -qsbec0 gyp06axis. The velocity versus tis06gy bqc-0pe me graph of this object is

  The slope of a position versus time graxmm(u q+d)y8 ,mg p49: mfocfeph gives

  The slope of a velocity psqlt-9 +s a qp)e6k)aversus time graph gives

  The area under a curve in an acc*zotn-p z1)n oeleration versus time graph gives

  The area under a cur:zdilih5a16cihz w.. ve in a velocity versus time graph gives

  If the position versus time graph of an object is jfl q2n-w 7p7rp neg08a horizontal line, the object qnw8 rej -nl7fg0p2p7 is

  If the position versus time xjls9t21i(;gxtyj8 87x aomfgraph of an object is a vertical line, the object istf818a9x( g7oi 2txmxj j y;sl

  If the velocity versus time graph of an object is a hocoxsmu w )ds7uyviea70 l z3+pcs/(+ ;rizontal line, the object s v7+e+i )z ylx;3/o0auu cpcw s7mds(is

  If the velocity versus time graph o(f3hi98pg g o(j. zuibf an object is a straight line making an angle of 30 degrees with theh zgj8i3iopu9(g (fb. time axis, the object is

  An object moves 15.0 m norb2 a luhpr.h2 fnsk,jcz)ii- phj2; 5,th and then 11.0 m south. Find both the distance traveled and the magnf j i2; .j,2 ahp-5hp2)lzh,ucsiknrbitude of the displacement vector.

  A boat can move at 30 km/h in stv 2;c 33icp ,da,io *xxpn)rvgill water. How long will it take to move 12 km upstream in a river flowing 6.0vx, pi) aicc n;p2,3g*dorx3v km/h?

  55 mi/h is how many m/s? (1o9i91 ewlegl22myv5 w6+ knxz mi = 1609 m)

  What must be your average speed in order to travel 350 km in 5.zp;w9xzme :+i15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours aft9(/aea+ cxand 57 min. What is the average speed of the runner in m/s9t/e f+caaax (?

  A car travels 90 km/h. How long does it take for it to traveu3r4 zoi9cbrdgk ,*5sl 400 km?

  A ly (light year) is the distancj*jm3b;zzw8dz(g6m /-px qg re that light travels in one year. The speed of light is*r p mzbj8(jq3g;gm xwd6 z/z- $3.00 \times 10^8 \; m/s$. 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 s l0tpg;-y5 p*ourg9cyou look to the side for 4.0 s, how far do you travel during th s0 r95ggouptlcy;p -*is inattentive period?

  If you run a complettropxz *0a;1y+o;n eue loop around an outdoor track (400 m), in 100 s, your average velocit1nrea oo0up * x;z;ty+y is

  A polar bear starts at the North Pole. It travels 1gs-;4 a.br at j/ok4cr9 c mmqoo1h:i1.0 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 sp1kogr:j;a9 om 1 qb o/m4-t4s ari.hcceed?

  A polar bear starts at the North Pole. It travels 1.0 km so2pqgv o4ju5q )uth, then 1.0 km east54 gqo )puq2vj, 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 velocity?

  You are driving home on a weekend from school at 55 mi/h for vi m,r3rw*j o4,ewt:m 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hmr:me * r3,tvww oi4,jometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 108dqgin7eep v.fc z4 u7r+,u.7i xebl)0 km/h. What is the average z .x7ie7)+ u8rlegu7efc,nqb. p d4ivspeed of the motorist for this trip?

  A motorist travels for 3.0.zbqam)xz 75 k h at 80 km/h and 2.0 h at 100 km/h. What is her aver z7.bq)kzm x5aage speed for the trip?

  An airplane travels at 300 mi/h souwd2thj1pny.g) raq1+(7dm gf th for 2.00 h and then at 250 mi/h north for 750 miles. What is the average spen a.j1 p7gw)tf rmygq+dd (1h2ed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 100 m) for tc:stsw6c:- h+ defig*eam A caw+: sd*f-cc6 etis: ghn 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 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 9 s. T94h syhw1ux5 hdit+l1 he car's average velocity during deceleration was dh4 tw1ush y+5x1lh 9i77 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 /d h5w nvvv.4crate of d nvv5vh/c4w. $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerate/crz+vo)0 a xqfw)q8w (m 1krhs 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 accelerat927y m;bzqnb t ozl,s.9o gqyy;)t;m kes 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 const jopx a/8*g5mn g;svc0ant acceleratioa50/cvg gs p *8xmnoj;n of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velos(9 .v vztb7hvcity of 1.1 m/s experiences a constant acceleration of 9vhzvv( 7ts .b$3.8 \; m/s^2$. What is the cart's displacement during the first 8.5 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed ofvsd/a1mzh -e p0eiyy150 2iix 360 m/s strikes a sandbag and penetrates a distan5zp y s yv10ia2 iei1/mh0-edxce of 86.07 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 carrier. It rea;zawet w)fs9w k* o/;vches a speed of 42 m/s at the k;aw9vewz)f/*w st; oend 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 movesursi20k40 8s ol +wxil with 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 owe7 l :u9ff0jmw2o5m fr i5f*6kcjn:distance of 200 m. What is its average accelerationi572cfkje0*: r o9:ju65f mn wl omffw?

  An object starts from rest and undergoes uniform acceleration.q 2:6priwsa ; ,nnwd;s During the first second it travels 1.4 m. How far will itnwa; si2s:6w, n qd;rp travel during the third second?

  An object is moving in a straight line with constan3m,5wz soa2 pjt acceleration. Initially it is trsz,5awo pm3j2aveling 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 accelerates uni6q .mmij 9lu o ;z: i;muqr2utn60y92tb4kbkxformly 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 ab nl/jt1hxyf w13q1rl ye08ol 9out $5.0 \; m/s^2$ 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 thazbv 5,zj1 k: zpmalv6g 6*-wkot has been waiting at the intersectkg5akm1j z -wpo:z6,v*6lv bz ion 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 wb)7anp x;ezi8)z; m+ feuaqc. ith a speed of 12 m/s on the surface of planet X where the accelecmzfb). e+ i7qu8a z;ep ;n)xaration due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown -vbz 0jojfm:.upward with a speed of 12 m/s on the surface of planet X where the :zf bmj-0 vjo.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 s vx k0j+cds)q6thd,up*a)s g 2urface of planet X where the acceleration due to gravd,) q* g 2)js6a0xp+vuhcskt dity 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 onbd6:l)y hspv8 the surface of planet X where the acceleration due tlpvhb:8yd s 6)o 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 0.10 s.u umbh*q./0uj c ik1:r If your friend holds a ruler between your fingers and releases it u.q 1hucr/kj: *i0umbwithout 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 velocity 8kyd 1w1a ztn,after 3.00 s11 kyzdtn,a 8w?

  A bullet shot straight up returns to its starting po71mag wkt+ )ht bh-014xpow ysint in 10 s. What is the initial speed kma711bo) twhp +h0 yws4x-tgof the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s.bpwaq5k0 7vf+ 1/m)xxrh,g3 gpr k8jd How long does it take to return to its starting gmk0 k1 vx8+,jbf pawrghq )r5x /d73ppoint?

  A ball is thrown downward from the ,a8.j 68m:vgrk uyexjtop of a building with an initial speed of 12 m/s. It strikes,j8aejrx :8y m6vkg. u the ground after 7.3 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numeric4wxhg 1osr- ,cal value in the blsg4cxo ,-w1 rhanks)
(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 d0-t *(miq:7evkxzj.ba9)qs k d2jjowith a speed of 37.2 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 3 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 =x (r 0aeay*z,l 1.0 s?

  In Fig. below, what is the velocity at t = 2.pqxzs3*-a21qq d*fas 5 s?

  In Fig. below, what is the velocity at t = 4;mfukl0bh.i 4gj/ia l- q2 wd jh,8v6q.0 s?

  In Fig. below, what is the velocity at t1q3,w4b5sr ptmr92ma2flju n+p u 8cn = 5.5 s?

  In Fig. below, what i; ry9xvbq a,:is the average velocity from 0 to 4.0 s?

  In Fig. below, what is the average veloci swnmi 9yj5i3jup6*2 pty from 0 to 6.0 s?

  In Fig. below, what is the acceleration at 1( r77)wjl.*v:bp 1up aqrccrf .0 s?

  In Fig. below, what is then/:wu l vvo1og qnnw65f.-4b r acceleration at 3.0 s?

  In Fig. below, what is the average acceleration fr yiu8gzid1(x5h6/n 5m fkoc,wom 0 to 5.0 s?

  In Fig. below, what is the average acce -fh283-8yijn) qc +d(hz:rbjrrit ltleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from k6-/kw- mr; uqg ys/ad gwi2r;0 to 8.0 s?

Does a car speedometer measur 3k :ya2lpd8 vmola ,+rx.qhg2e speed, velocity? {speed|velocity}

  An object can have a varyingao zg;eo-lx16rw t kefe(5 .0g speed if its velocity is constant.

  The velocity of an object can be negative when its acceleration i)x-si wnl+li;s positive.

  If one object has a greater speed than a second object, the first mu2mk .i uo2,p. fkln;5a x2tkxwst have a greater 2mk nx,xktukia2.5wflo;.p2acceleration.

  Two cars emerge side by side from a tunnel. Car A isz/5 v**e-aqc 5py3(i fbwrox r 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 i;;u3t4) iufthyt;s s04jfk ken speed as its acceleration decreases.

  A baseball player hih8xs7 k 3l5hobyx h4/sts a foul ball straight up into the air. It leaves the bat with a speelxhb 5x 84 so/73yhhksd 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 happen fv ej7ni;s/;zi/a * l+g8 4.tovpblaxing to its acceleration, how does it change if air friction i4/7tvx v .s8gj+; a/ione ;alz p*blfis ignored?

  As a freely falling object speeds up, what is happening to its ad9 x3xq- fibi-cceleration, how does i-9b fxi-dxqi 3t change if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its origina0n i iq3mbti:;)igc , ybnlf8,l position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this result be alterei qcil; 0nt imb b:8,3y,nfgi)d?

  An object can have zero v9y +;vkopjb8f zn/9b y,ktx9felocity and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at w: ,nv5/x):t s+gfpwyp)zw)pwatku. n t6z;j the same time.

  An elevator moving from the second floor to the fifth floor2ntec6/9sp o6dap:+mr dod/z making no stops along the way has zero acceleratcsnpo/6 atpdezmo9 d +r:6/2 dion all the time.

  A rolling ball moves fr1)2n-nzimp/xhk8 un h om $x_1=2.1 \mathrm{~cm}$ to $x_2=-5.7 \mathrm{~cm}$ during the time from $t_1=1.0 \mathrm{~s}$ 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 $t_1=-3.9 \mathrm{~s}$ is at $x_1=2.0 \mathrm{~cm}$ and at $t_2=3.8 \mathrm{~s}$ is at $x_2=8.2 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps aro7 rwjl1) wufu9fk19tl und a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 9.7 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away fro ;d6lotetm4m ,w:z y)im its trainer in a straight line, moving 87 m away in 10.2 s. It then turns abrup64mztyd,w o;e: l mt)itly and gallops 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 froz7zo)g0h m hp*m $11 \; m/s$ to $24 \; m/s$ in 5.5 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 6b2,kn.o; i ueffu(lx w/vb; n$15 \; m/s$ to rest in a distance of 59 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a s6 h 1+p ;cf;w2bbjbd)qog-vgxpeed of $31 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.7 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of tl68l hyk0*pfyhe blocks to essentially top speed aboufp0hyy lk6 l*8t $10.5 \; m/s$ in the first 12.4 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 m+f9nx,x hj8icb6d4 a$16 \; m/s$ to rest in 4.88 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 qm5wl ez e16kis xyw.3*gqa0o /-g1iwon the highway. Assuming a deyq0/lws 6z31kig1eawm. w5 igex-q*o celeration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck meoxrh8+nu8h8*a4vd crv)b +aki)w36 a:fc cgoing $25 \; m/s$ 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 10,007myym(d3 hy 3w0-m run in less than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner mustmdyh 3y3 w(7ym then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$