Suppose that an object travels from o ;fdg bgum /1gz0y-mt1ne point in space to another. Make a comparison between the displacement and the z1- /m1g tyf bmgud;0gdistance traveled.

  When is the average velocity of an object equal to the instantaneous vel j g+lzx2 7ucy9pq0n2bz2)fx1rtee z,ocity?

  A new car manufacturer advertises that their c-kxbmgn)q9v .c l2r8(, eet8y:xmh c war can go "from zero to sixty in 8 s". This is a descq-cyt98 .:2w,xre xcbgev( kmh )nm8lription of

  An object moving in the +x axis experiences an acceleration o9s i;:h9o a66v9 o3ek u:rfifcmag9bqf $2.0 \; m/s^2$. This means the object is

  Suppose that a car travel,ttcb. 5igup(xrh/f3 ing to the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerninr hb/pu 5ct(.3,xf tigg its acceleration.

  Suppose that a car traveling to the Wes29 5i+3vvtg37yo g cvifars3mko/i jj t+,kc)t (-x direction) begins to slow down as it approaches a traffic /+9+ivmi r335ty sacgt )cigvvf7,k3o2jkjolight. Make a statement concerning its acceleration.

  Suppose that an object is moving withx 1bzpbc 2 )*s1fbdpu, a constant velocity. Make a statement concerning its accelerab)2bppb *1,u zc1sxdf tion.

  If the velocity of an object is zero, does it mean that the accelerationp-:r9vsexwprwx 6c, . is zero? Support your answer with an examp e9s-x ,ppc:w rxwr6.vle.

  Can an object's velocity change direction when its acceleration is consrz cw)3ig ;is4tant? Support your answer with an examplei;r) 4czgsi w3.

  Suppose that an object is moving withirw:tl o)2qmf ggwsh35oc:7j +d i9t( constant acceleration. Make a statement concerning its mwcht)f(w7i jlori95q3:m to: +g g ds2otion with respect to time.

  Can an object have increasing speed while its acceleratiohqvao0 8mg/z dj pre38b :0b*nn is decreasing? Support your answer with an exampz/* : or8jn mb0ga dqepbvh830le.

  Suppose a can, after an initial kick, moves:sbg cp ze je;)2n*o)e up along a smooth hill of ice. Make2oebcz ne*; j):pe s)g a statement concerning its acceleration.

  Under what condition w6 -lvw l*: ;egnfej7xis average velocity equal to the average of the object's initial and final veloflxjwew ;n:*7ge6-l vcity?

  Objects A and B both start at rest. They both acceleratn4u i/bu .teyre): ymrgm9 ((ce at the same rate. However, object A accelerates for twice the time as object B. What is the final spee9(t rcr4i)e m e:ub/(nm yug.yd of object A compared to that of object B?

  Objects A and B both start from rest. They both accelerate at the same rate. om o6cx9 g3bra: 5dh*s However, object A accelerates for twice the time as object B.gohcax9 5sbo:r6 d *m3 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 ab c yn6uhhi0f-rd2 86masence of friction, which of the following is true concernif0c2ma6ryh8d-hu i n6ng its motion?

  When an object is released from rest and falls in the absence of frictioqu;8s m fmmo(s)u0 j:jn, which of the followqj;()jomsu:s8 u0 fm ming is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the velocit8l xokqob2z/jnq9iy wl :6 a-5y and the acceleration when the ball reachesjoknq/9i ow-z52yq68al :lbx the highest point.

  Suppose a ball is thrown straig07ifw.n 705p bmmvhz aht up. What is its acceleration just before it reaches its 7w pv fbz7m.5m0hn i0ahighest point?

  Suppose a ball is thrown straight up, reaches a maximumdrpy;/ocfm hbc6 .l63 height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as thypdr6 l6.h3mbcf; c/ oe ball is going up.

  A ball is thrown straight up, reaches a maximum heig t5pj:idg)o 7wht, then falls to its initial height. Make a statement about the direction of the velocity and acc:)j7 o5pgidwt eleration as the ball is coming down.

  Suppose a ball is thrown downward in the absencerz ;wuziv795 0 :rmvix of air resistance. Make a statement concerning its accezrz9r0; v i7i:wvmx5uleration.

  Suppose a skydiver jumps from a high-p*p u-mp,/n mwflying plane. What is her acceleration when she she reaches terminal veloc p/mp-np,m*uw ity?

  A ball is thrown vertically upward with a speed v. An identical second ballrq 1asjckm;9vq5pe9 7 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 the firs9v1mcjq9 s;7rke5 paqt ball?)

  Ball A is dropped from the top of a building. One secon-h92uc cj8ickjlaw tuw(4r .- d later, ball B is droppw a-u-cc j.l2(tw8 u4kc9jihr ed from the same building. As time progresses, the distance between them

  Ball A is dropped from the 0(*pne:hr j uztop of a building. One second later, ball B is dropped from the same building. As time progresses, the difference in theirh: ue r*n(zj0p speeds

  Two objects are thrown from the top of a tall building. b hdno9hq*4.eOne is thrown up, and the other is thrown down, both *4 bne hhqod9.with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a buildin r1xbrj oo8/3xg. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistabo 3/1j xrx8ronce. Compare the accelerations of the two bricks.

  An object is moving wix/scz,od hlc1v, wy77th constant non-zero velocity in the +x axis. The position versus time graph of th/sly17v w7c,zhcdx o,is object is

  An object is moving with c3xy vmb-jq22constant non-zero acceleration in the +x axis. The position versus time graph of this objc3 x vy2j2q-mbect is

  An object is moving with constant no 7t:c0xjv zz1nn-zero velocity in the +x axis. The velocity versus zjv 0c:1ztxn 7time graph of this object is

  An object is moving with constant non-zero acce7 wmm0c db fya6vyt+80leration in the +x axis. The velocity versus ti 0bwt d6 yc+7mfamv0y8me graph of this object is

  The slope of a position versus time((pf fc j0:w/7 jvgwalx) ttl: graph gives

  The slope of a velocity versus time grhfw9k*8b1v d1m-, ftb ts ymm0aph gives

  The area under a curve in an acceleration versus 8ah*a j*b1wxd9di8v zu2c.h utime graph gives

  The area under a curve in a velocit,mu1 er1a2 udmy versus time graph gives

  If the position versus time graph of an objex+f5gcwl 6 epkf *b+:jct is a horizontal line, the object iskgcf+ex6:lb f 5p*w+j

  If the position versus time graph of an object is a vey 1 ;jbkv-3cdtrtical line, the object is 1b;cdt 3y-jkv

  If the velocity versuse*ao.;c*dx qn time graph of an object is a horizontal line, the object is . n;o*ac*xqde

  If the velocity versus time graph oaodpbi4 mvg3a, 0i *b*f an object is a straight line making an angle of 30 degrees widi *gbam ,aip34v* o0bth the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. F-xmn /o 8k7k,klw)dpg)vpsd8 ind both the distance traveled and -dn8k ))8kdx o s wkpvp7g,/mlthe magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long will it take to move l 2dh6x(d; rut12 km upstream in a river flowing 6.0 hurxd;l (6 d2tkm/h?

  55 mi/h is how many x 1ou:z(,gof sm/s? (1 mi = 1609 m)

  What must be your average speed in order to travel 350 km itc; rz/y r*de4 2keh0m/xot(r n 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in e8*pxaun 5ed/ 2 hours and 57 min. What is the averag5dx8/ apn e*uee speed of the runner in m/s?

  A car travels 90 km/h. How long does it take fow- wt(xyy p-cd1bgud4 ( .ji)nr it to travel 400 km?

  A ly (light year) is the distance that light travels in one yearvse36r 4 rfli5. The speed of lightsv3r i6 5efrl4 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 along a;pffb61 o8sp u straight road and you look to the side for 4.0 s, how far do you travel during this inattenop; 18sfpuf 6btive period?

  If you run a complete loop around an outdoor track (400 m), in3lt1m0h(hmy4 3,qrbrb y6cxp 100 s, your average ,3p03lm6thcybyqr(r x mh 14b velocity is

  A polar bear starts at thhz +pwb ) 4lcrsqtd97jwq 068jezv,5se North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km norbc vde7w6hqjp,tzz ) 49+w0jls8sr5 qth, 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. It travels 1.0 km soucv4t-mk)gybw ) ud(r :th, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. y)v)u gm4-:tcdkw(rb This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from school at 5z;r8 9,kqf)quz x 0ryw5 mi/h for 110 miles. It then starts to snow and you slow to rq; w9r8 uq0x )zky,fz35 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.nlo yu1it09z(m 3/aol What is the average speed of the motorist for1zo /3lm( yn9l0oiaut this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her av h 48mj/mkm4 l+5elslgerage speed for m5k/ sllhemj 84+ gl4mthe trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250;o-f k 3+u5n6y6/n of5y fvperjaj w5w mi/h north for 75eav3rnj6n6f 5kp5oyw; jf+5ufyo w/-0 miles. What is the average speed for the trip?

  In a 400-m relay race the ancho(l ut t.3j/ udo5nvln,rman (the person who runs the last 100 m) for team A can run 100 m in 9.8 s. His rival, the anchorman for team B, can cover 100 m inl(.tjut3vnl,u5o / nd 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 13 s. The3obgdjc74m yfy s1 *4;qisd+ q car's average velocity during deceleration wayiq * 31j ddqcmg47b+y;ssof4s 63 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 16w07ytk7s +qqwkl r0oj**bgj (0 m/s, at the average rate of ( jokqk0w *b07g*t+7 wrlqj ys$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the ratmm fui0*n( k-auvyyz0 ( j h.w3v+z(koe 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 accelerphb5 8,blk;32fdb i vaates 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 consta)nihgb*dpq)m z.; a 9ant accelerationnq ga9dzpib m*);.)ha 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 4.6 m/s experiences a constant4or7y sl+dj k+ acceleration of +kdl ros7+4jy $4.8 \; m/s^2$. What is the cart's displacement during the first 4.7 s of its motion?

  A bullet moving horizontally to the right (+x direction) with 8aq 9zthrabc -a)8wv6 a speed of 276 m/s strikes a sandbag and penetrates a dista)zra8b9 - 8chvt6q aawnce of 42.50 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an/ehuiz 56 k1l*o3 cldn aircraft carrier. It reaches *l53 /k ehzu6ocdnli1a speed of 42 m/s at 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 mov9m65 v)zvd gbbes 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 distance of 200 m. What is it pyvmua66xvcm7dc k:w*u:n /7s average accelew x v:7m7nccm/ud upy*:6akv6ration?

  An object starts from rest and undergoes uniform acceleration. During v1w ;pz6;oru:yjb ae lust.qg ok35-1 the first second it travels 9.1 m. How far will it travel during the third t s wqooz yavkug -361re;:5j.;bl1 upsecond?

  An object is moving in a straight line with constant acceleration. Initially vmx8+5ioq w,j it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How wmxi,v 5jq+8ofar does it move during this time?

  A car starts from rest and accelerates uniformly gtc;f.;,gvr 18 mnemi 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 n w.k212c:cauiupl .uabout $5.0 \; m/s^2$ 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 turnuwldultlo;l 6u 5 3 xuatb2s5b7 c*28ps green, a car that has been waiting at the intersection starts ahead with a;lxbo852c*tlpus362uw b d l7ula5t u 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 ovbqk.s0 .a7sq. +spyun the surface of planet X where the acceleration due to gravit07.u .kbsvp sqyq.+say 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 gwddi e1/va3wv .h-wyt h x642on the surface of planet X where the acceleration dut6ydw 3ew /x21hvhd a4 -gw.vie 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 ttsz*c6 s)l3e .l ns9zplanet X where the acceleratiozs z*6 l3t)ss9c .telnn 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 a speed of 14 m/s on the surface:qe/7q7 hpaje of planet X whepqq e: ahj7e/7re the acceleration due to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time a3d+ rfsm*;1gqq;gk du j9i:l is usually 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 to fall before you m3drgus9;fajk+g*;: l q1iq dcatch it?

  A ball is thrown upward at a vqfy a)5n uu (5t5 he8sh8ud:deelocity of 19.6 m/s. What is its velocity after 3.00 s?yqu5uh)dnda5hf5 s88 ut( e :e

  A bullet shot straight up returns to its starw2;cn/11yc fby ii 3ou.rcnb0nc 05xx ting point in 6 s. What is the initial speed of the bul5cn0 wb/0ic c rfux nyxio.311y b2;cnlet?

  A ball is thrown straight up with a speed of 36.0 m/s. uz(.sacfji;k;i ) l;*aw 9bf iHow long does it take to rfsi)ak* ji ;wfbuil a;.9c;z( eturn to its starting point?

  A ball is thrown downward from the top of a building with an initial speed of 6 alp*z4 8v-w im1z8g ltm/s. It strikes the ground after 1.3 s. How high isgp1z8 vi-z*w4 llmt 8a the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numericalleck p e //t64fvokf3r(6lc9gzfr6 o2 value in the blankseo3 c(p f e26golltkf c4/f6/vrz69rk)
(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 o l anl sv;-20gkre-x3wf 30.5 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 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 is the vel r:rh p1d-y:d0 0ihdbak7 vwm5ocity at t = 1.0 s?

  In Fig. below, what is the velocity at t -eu nzl* ;i)jkduprrm)t:3 7a= 2.5 s?

  In Fig. below, what is the velocity at.bo6+ p, nfyy,(ejlns,v+c p j t = 4.0 s?

  In Fig. below, what is the velocitymn5-i q,xq62 pthv wlx.ed( e. at t = 5.5 s?

  In Fig. below, what is the 27,; l v5ykee+elutme average velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0ohtxjv++ +9nj+f p88:s;fo: dwku axt to 6.0 s?

  In Fig. below, what is the acceleration at 1.0 s?3k-z dddu je5ti6d2jw:pk2* p

  In Fig. below, what is the accelerl5gs9;rkd +-sk:kwfe.xu 9 foation at 3.0 s?

  In Fig. below, what is the average acceler zbn2k8 l/:;tfn(tolsrwe 5dtxs4;:w u y7x0lation from 0 to 5.0 s?

  In Fig. below, what is the average acceleratiof kr:g5z +.dc krvyb(;rj;a ,ru3ps2an from 0 to 8.0 s?

  In Fig. below, what is the displace26dv/at w uiw8ment from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {slxm3wq.5*+nyl(ul z epeed|velocity}

  An object can have a varying spz)wd6 7caa)biw9pq g*x2n-h/p nn0e h eed if its velocity is constant.

  The velocity of an object can be negative when its acceleration is positive 4tbk; 4pphz y(.rjs4y.

  If one object has a greater speed than a second object, the first mep ywjk7y95v.l5wyj -ust have a greater accelpjlj7 5k-5yvy.9y weweration.

  Two cars emerge side by side from a tunnel. q b26jolex wd5*ycy t7 3uvz koz0l9/*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 ilituir9e84 w;ts acceleration decreases.

  A baseball player hits a foul ball straight lx)x. w:berygql,(3yfp+2y fup into the air. It leaves the bat with a speed exf+wllp,x y2yr (y qbg:3.)f 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 acceleratio*e6;l1d p/f 2toue/ 7wzeyrzd n, how does it change if air friction is igno; fd6/y2tld1ep/zr*zew 7ue ored?

  As a freely falling object speeds up, wha l;b vk(wz71lot is happening to its acceleration, how does it change if air friction CAN 1vkz; ol7l(bw NOT be ignored?

  An object that is thz b(o8hecui9ui h+o7 o .x3(wurown vertically upward will return to its original position with the same speed as it hauouieo37hw xbc+ 8u hioz. ((9d initially if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzes3/v usro+bwy ;urkv0 q6ek*e.:6 vpjro acceleration at the same time.

  An object can have nonzero velocity and ze r 1u7e(8gdb bzu-sfvr3x;oq .r wxzgj:t4 p6,ro acceleration at the same time.

  An elevator moving from the second floor to the fifth floor making no snfmv,vo rei3 c;ospi8l:pv9 8gq 0k17 tops along the way has zero accelerat;i,mei19 p3qo0 lv 7n v foscrgkp8:v8ion all the time.

  A rolling ball moves fp)p5mi .xx +*g +pmtixg2/xs xrom $x_1=2.5 \mathrm{~cm}$ to $x_2=-6.5 \mathrm{~cm}$ during the time from $t_1=1.5 \mathrm{~s}$ 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 $t_1=-2.7 \mathrm{~s}$ is at $x_1=2.0 \mathrm{~cm}$ and at $t_2=4.1 \mathrm{~s}$ is at $x_2=8.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps aroun:y6w*u4yn 7 ;jvq0me9u 6q+a vlkuv und a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 10.7 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 lijep5qj rg8h:8 . wn- in;y0lmqne, moving 99 m away in 11.8 s. It then turns abruptly and gallops halfway back in 4.7 s. Calculate (l j;5-qy 8n q re.8nh0ijp:wgma) 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 0jdljyem hl;f 8g 46x4$12 \; m/s$ to $23 \; m/s$ in 5.3 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 fromnjp8lw.uuv;9 $16 \; m/s$ 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 +a3kkjnt jj.0 speed of $28 \; m/s$ 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 o7 w5)w9g zilsbypqx :5ut of the blocks to essentially top speed abouyl5i:wbw pxg9zsq)5 7t $10.5 \; m/s$ in the first 10.6 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 unirt7( 9d ru ktz6wbydm.r /xr.:formly from a speed of $20 \; m/s$ to rest in 5.23 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, amyw))3m,2b6 / m+jogrzmbla y car leaves skid marks 92 m long on the highway. Assuming a decemyy)mjgr2 6a/,bwz) m o+ m3lbleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goin8sbx: z3g 1ji cst*-s qy znzf,o2pq/6g $25 \; m/s$ 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 10,00og: ,g:hsi:tr(,v wpoz 6/ hfi0-m run in less than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner must then accelerate atvo, ho ,tzh :pr6s ig/fi:(g:w $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$