Suppose that an object travels from one point6r xzzoy,c5*g in space to another. Make a comparison between the displacement and t6y,rxgc5oz *z he distance traveled.

  When is the average velocity of an object equal tof-; d,ev avc2r the instantaneous velocity?

  A new car manufacturer e 7vby s5tzkj5 oc00c8advertises that their car can go "from zero to sixty in 8 s". This is 0s 5k8oyez5cb7jt cv0a description of

  An object moving in the +x axis experiences 1t i4jhf 86j5er -1vwvs60p rlkc4wqp an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to26mrot r.kut e.b;8u q the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning ire8tur mk6q;. .t uo2bts acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slow dow x:i wnlaq lx/3h ihlel;-8v ga6jxp;((:u vj3n as it approaches a traffic light. Make a statemenxx3x6laqh(g3 :8hu ve(l l:jw /; l-ivjnai p;t concerning its acceleration.

  Suppose that an object is moving with a constant2 htu+wh 80nhv velocity. Make a statement concerning its accelern2u vh8hw0t h+ation.

  If the velocity of an object is zero, does .zj +-7 a ailohk4oxy.bhlzt8*bv 0,ait mean that the acceleration is zero? Support your answer with an examp.jaz8*b vao to-. hl h+70ly,4kaxzi ble.

  Can an object's velocity change direction when its acce ej1v4w5x6ocdzo m, iu)69kj hleration is constant? Support ovmxw 61oic5hz6j9 k,4eu jd)your answer with an example.

  Suppose that an object is moving with )gb91swcs3lb av i8i +constant acceleration. Make a statement concerning its motion with respec8+va )1sb3lib iwcg9st to time.

  Can an object have increasing speed while its acceleration is dl*d l+hutzijsbc; 4t7*qgq5-ecreasing? Support qllz s7 b+ t*4c*ij;qtd 5-ughyour answer with an example.

  Suppose a can, after an initial kick,fm 2 0vi;8ycfm moves up along a smooth hill of ice. Make a statement concerning its acceleratiyc f2; 8i0mmfvon.

  Under what condition is average velocity equal to the , k i. mmz.e1nxcd.,vw0(p pzlaverage of the object's initial and final velocizv(lw. dcenpim.,m 1 p0,.zkx ty?

  Objects A and B both start at rest. They h-xydzj.2o/ l yb 8k+eboth accelerate at the same rate. Howebj 8.dk2h-zyy/ e+olx ver, object A 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 rest. They both accelerate at the s9sn -jz+hr9p-pjltv )ame 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 -9s jr+-lhjv)9tnpz pct B?

  When an object is released from rest and falls in the a 0zzh6f i1ob8x-a)g8 i qrcw2lbsence of friction, which of the following is trzgircfbh q- x86w8)i 1a2olz0ue concerning its motion?

  When an object is released from rest and falls in the absence ofn imn,z,s24536 zlsf bedgkb, friction, which of the follgfz2e s 4zb,lb3 s,mid56nn ,kowing is true concerning its motion?

  Suppose a ball is thrown straighvf94jaaf :;jct up. Make a statement about the velocity and the acceleration when the ball jc;vf4ja :9af reaches the highest point.

  Suppose a ball is thrown straight up. What is its acce-/epdkhmn9l19w b u;zleration just before it reaches itskmbn le; w9d1 p-u9/zh highest point?

  Suppose a ball is thrown straight up, rear *)wj nvy:-i ebyj()/jwt:hhches a maximum height, then falls to its initial height. Make a statement about the direyyh: tn(jbh )vj/-r iejw* )w:ction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls to i3cm cff-bi*0p ts initial height. Make a statement about the direction of the velocity and acceleration as the ball is comfc f3pm-*icb 0ing down.

  Suppose a ball is thrown downward in the absevnbis1 ,vla/4l wq64p nce of air resistance. Make a statement concerning its /4wb 1vvlp6 aqsl4, inacceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her acceler07 fv+;e7 *ehhe64m t gyrkfgvation when she she t+mg eh;veh767yegff*k r40v reaches terminal velocity?

  A ball is thrown verticall3ha9)hfsip(o4 sh *u u4v7 tdz n8n1yoy upward with a speed v. An identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximu18hy*ns9 ov (73)u4 i puzaotnhsh4d fm 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 q66kt8w ae-grlater, ball B is dropped from trak6g-w68e q the same building. As time progresses, the distance between them

  Ball A is dropped from the top of a bu k s*8lnmn8g8uilding. One second later, ball B is dropped from the same building. As time progresses, the difference in their sg *8ksun nml88peeds

  Two objects are thrown from the tbkc f3 *j6q5l.)q) qnstkqvb ,op of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds ) kt5)fcq b vk.3qnlsq,6b j*qwhen they hit the street?

  A brick is dropped f7:9 6uys9mqffo r1jpurom the top of a building. A second brick is thrown straight down from the same building. They are relu y :uo9s79fpfj rq1m6eased at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. Ths r g8 acmoxw 6)plo)smq2 7m1v-ldwrf:z-(7ae position versus time graph of m6rmwzsl2)r 717g fpld )waocvm (xa-oq 8:-s this object is

  An object is moving with constan ;z.jnkt*4jqnn;0w uk v/hx0nt non-zero acceleration in the +x axis. The position versus time graph of this okz*/jjukq0; n w vxtn.nn0h;4bject is

  An object is moving with constant non-zero velocity in the +x axis98tg wtvsa+ 5i. The velocity versus time graph of tti sw8a +t5vg9his object is

  An object is moving with constant non-zero acceleration in the +x axis. The mk8b-p 1we5w uvelocity versus time graph of this u1kw- w8mpb5 eobject is

  The slope of a position versus ti,i,+5j5dlc8lkt(-fr tmz k qnme graph gives

  The slope of a velocity versus tihnx;e p.kg ..p j(jor+najk2/me graph gives

  The area under a curve in an acceleration versus tx50t 6vpotfra nv,c(. ime graph gives

  The area under a curve in a velocity versus time graph giv:i)+brpir; +dgbgoa 2 es

  If the position versus time graph of an object is a hori) 7gb(d7 voupt 8vh8vbzh6 6hszontal line, the object ig bvhsh)vu78hv8 6(7t bpdo6zs

  If the position versus time y:: x6i pb.qp bg:pao;graph of an object is a vertical line, the object is6 :xyg. pb;app:o:qi b

  If the velocity versus time graph of an object is a ig gp1d ,,y bud,z:v8whorizontal line, the object d18yp:,, w u ggivbzd,is

  If the velocity versus time graph of an ryw66n n 9da.nobject is a straight line making an angle of 30 degrees win9d6.n wr6yan th the time axis, the object is

  An object moves 15.0 m north and +0a3933*molyvt4u v uaj0bcekbk: e ythen 11.0 m south. Find both the distance traveled ayme:*o0v 3lakcbj3u9+4vkb y30 eta und the magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How l gcu6 y7vnvq7)ong will it take to move 12 km upstream in a riveuqnvg7 yc7v6)r flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 16s8 dkae;jxoigjd 3 5:609 m)

  What must be your average speed in order to traubuvt8 fq: h5-vel 350 km in 5.15 h?

  A runner ran the marathon (ap ip5dsw7x 7*jgproximately 42.0 km) in 2 hours and 57 min. What is the average speed of the runnej7xw7d *p5g isr in m/s?

  A car travels 90 km/h. How long does it 0p9hsa q c pi0 g+y,*9c(mvaihtake for it to travel 400 km?

  A ly (light year) is the distance that light travels in one year. The s+tbzy)yo usc 5 re85u**9yy h8bj-gwppeed of lig8 puye +55 gzh-9syc)jrtu* obw8 yyb*ht 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 straight road and you sb .p qj wi1n a7j1lk.a5.qjh8look to the side for 4.0al5 .hb1 i1s8. kjwn7qajq.jp s, how far do you travel during this inattentive period?

  If you run a complete loop around an outdoor te;ea-h rzx (;/cyu rh7rack (400 m), in 100 s, your average velocity is -u eax/; 7rye;chhz(r

  A polar bear starts at the North Pole. It travels ;q;. 6llnfskwueu wwl8 ;k+n:1.0 km south, then 1.0 km east, then lql w6e8.nku+sn;ul;; fkw:w 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?

  A polar bear starts at the North Pole. It travels 1.0 km south,hd* 4bn5np/ph then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This5p h*bnpnhd /4 trip takes 45 min. What was the bear's average velocity?

  You are driving home on a wecsl g+0 /;f.2* n,bp rsrt brvtq,0osoekend from school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours a 0/*.rtbo;nqs2s rf+vg0,l bsptocr ,nd 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 8rt *of*b ;gp:t0 km/h and 160 km at 100 km/h. What is the average speed of the motorist for th;:bg*ftto r*pis trip?

  A motorist travels for 3.0 h at 80 km/h and , yi5uv hppt:exze(oj53*x( g2.0 h at 100 km/h. What is her average speed for thph5ye3xxuz:e p , o*ti(v5jg(e trip?

  An airplane travels at 300 mi/h south for 2.g6/vwg nna7z7 00 h and then at 250 mi/h north for gw /6nnvz 7ga7750 miles. What is the average speed for the trip?

  In a 400-m relay race the anchorman (thebwn2zjo8t b2u j15+ yy person who runs the last 100 m) for team A can run y281w b+jtoj un yb5z2100 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 un ks e.sxsf;6by4 9*p 2en,tnffiformly and comes to a stop after 14 s. The car's average velocity during deceleration was 41 km/h. What was the car's deceleration while slowing do,.sn;p *efkns6 2ef9st x fy4bwn?

  An airplane increases its speed from 100 m/s tetzqn ms2mw (s)ry* x e f;:g,l7cy9s4o 160 m/s, at the average rate of qg lt;) :e*mrey9zs fw2xs7,4c nm( sy$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h acprio1g/yh)muv78 b p-celerates 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 acoysr7/jn3a 7u(54ybt:jats d 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/s for 10 s. It then speeds up wi+ /2mys sz0w5lza ph7blbt( +ve5ppa,th a constant acceleration of aabty2/+55mzs+( ,evp phwb zspl 7l0$2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initianxhsbhy 7p or*n+zo6:o.) /l m*yetz 7l velocity of 5.7 m/s experiences a constant acceleration of o l)phr/b7:+zo nz67hn x*so.ytmey*$1.8 \; m/s^2$. What is the cart's displacement during the first 4.2 s of its motion?

  A bullet moving horizontally to the right (+xoa vq9 t+a e6iu;9oqc ,mkl3y2 direction) with a speed of 217 m/s strikes a sandbag and penetrates a distance of ac9 9ky qm;u qo6a3+io2tvl,e 86.00 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.zp13,jplxsq6s-+rhel,,y c h It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acce,16qe l z3p rxjhhs,+yl-s,cpleration is constant, what is the length of the catapult?

  A car starting from rest moves with conc93bhe cfyu1( q ;twh k*p.iw*stant 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 28hm g1by2sv1h 00 m. What is its average acmhbg yv12s 18hceleration?

  An object starts from rest and undergoes uniform acceleration. Durin3wk qh 4kd:6b+ s5uarqyr7e1u uthz :-g the first second it travels 3.3 m. How far will it travel during :uu y tr5wqu7hkqra e6+1 h4- 3sdbkz:the third second?

  An object is moving in a straight line w o lcedfpd+;8s1k6bq/ ith constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move durin l+ ed6kb1dsfop;/ cq8g this time?

  A car starts from rest and acceler7-2dd beqisl4n ak5d2kfk *kv*v/+doates 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 dr14sc5j* a2 1+5 xgbxijp iqitry 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 green,d.tdpl(: 2l t*yfty -m a car that has been waiting at the intersection starts ahead with a constant acceler-* tlp(t:y2 .yfmtlddation 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 w )rdpc b,)fynx6awo-*, 6znm.qpfb a5ith a speed of 12 m/s on the surface of planet X where the acceleration due to 6r ,.x6)fp-ny5, fb aqpwd) oa*cbzmngravity 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 tb-ulb h 99+muo gy+uc3lk*t( ehe surface of planet X where to -hy gu(l9+9c+*tl kbbu3meuhe 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.dw*sbv9( weq of 15 m/s on the surface of planet X where the accelerat9(bs*ew wqvd.ion 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 of planet X wo p(pt 7ixsc19here the accelec 9tspx (ipo71ration 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 than 0.10 s. If your friend hack( gv5 :k:tuolds a ruler between your fingers and rel:a(v t5kgku :ceases 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 vp va/v g arw)8bv4w*,uelocity after 3bw 8wv*4,apru/v avg) .00 s?

  A bullet shot straight txm)w 7y6h)t* )ear hmup returns to its starting point in 4 s. What is the initial speed of thetr mw6)7meyxt) h*h )a bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it taaryxvd. -msdf)l8 4*lke to return to )msd xy8 .4 -draflvl*its starting point?

  A ball is thrown downward from thwx(2,bsss-p538 h xwrp5vd2 t bnlo*z 3ioa6be top of a building with an initial speed of 29 m52so b( snh63optsz, b8bd x2air3x *5w-lwp v/s. It strikes the ground after 3.8 s. How high is the building?

  A ball is thrown straight up witjauq0 7;v q.peh a speed of 30 m/s. (only fill in numerical valuq upa0qv7. j;ee 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 th2fnn zv2 ly0l21kfky *e air with a speed of 42.7 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 11 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 11.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what ikb1u-yxa(g; bxu u(.90i sgwk/ko ,bms the velocity at t = 1.0 s?

  In Fig. below, what i q*vxjtazma. 0+8z m+is the velocity at t = 2.5 s?

  In Fig. below, what is t d4 *(djayg g3iu4wl,bhe velocity at t = 4.0 s?

  In Fig. below, what is the velocity at t = 5.5p2 5payf jr9i- s?

  In Fig. below, what is the average velocity from 0 to-bd h(( kwhcr; 4.0 s?

  In Fig. below, what is the average velocity from 0 f:00 nl 2ex ; 2lkgc r-ipbi gmz7xhkv0wfm/79to 6.0 s?

  In Fig. below, what is the acceler 6v53pyxm 8wn)xs uz9hy)g l:nation at 1.0 s?

  In Fig. below, what is the accelerati1 fu/;hr5 lg c(ocbbkt+;yed8on at 3.0 s?

  In Fig. below, what is the ave/ j 5sh+hwq1rwrage acceleration from 0 to 5.0 s?

  In Fig. below, what is the average accelekr bg-kldc / v7 rrhbdcgh*(qc+8(w(; ration from 0 to 8.0 s?

  In Fig. below, what is the displacem etz e4r;gago99n5 l2c+qt fb9ent from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|veloctw4 (e(gjc7vimwekx:m: g, +zity}

  An object can have a varying speed if its velocity is constanyes. /4welgm kmr*/y7 dlyt92t.

  The velocity of an object can be negative c ;qiji7w93dk when its acceleration is positive.

  If one object has a 4mxa24t;z p iggreater speed than a second object, the first must have a greater acceleratig2x ;mz4tap i4on.

  Two cars emerge side by side from a tunnel. Car Ab8 ;ke2s*jns yp*q(*j tzla /x 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 its accelert*khnd rtk tnq8ja+s- ,3y5:kation decreases.

  A baseball player hits a fou 1 8hqgz2mk8ncl ball straight up into the air. It leaves the bat wit m cnk2g8zq8h1h 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 spe *,,mfzllu 0zteds up, what is happening to its acceleration, how does it change if air friction *,zll tumz0f, is ignored?

  As a freely falling object speedsk:.gqk 3;zr eeg-t2gq up, what is happening to its acceleration, how does it change if air friction CAN NOT be ignoregkerq.e;t3: q z gg2k-d?

  An object that is thrown vertically upward will return hf kq ew0 ha.)*1x i((o-dgqkgto its original position with the same speed as it had initially if air resistance is negligible. If air resistance is apprq-o xa1 )e.hf*qg k (hwgdi0(keciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration at thllgmw*0ym8uc e+i/(deiamzr t o763;e same time.

  An object can have nonzero velocity and zero accelerationgog r ro.:w,.)9po 4n vbzun4x at the same time.

  An elevator moving from the second flooroyjq( n 7d-/g wb48fpb to the fifth floor making no stops along the way has zero acceleration all the timwb(74 djq/g-p bfon8y e.

  A rolling ball moves from u)mr-ty7o.0w 11yi j mkyuw+c6, llgk$x_1=1.9 \mathrm{~cm}$ to $x_2=-5.5 \mathrm{~cm}$ during the time from $t_1=0.8 \mathrm{~s}$ to $t_2=5.8 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.4 \mathrm{~s}$ is at $x_1=3.1 \mathrm{~cm}$ and at $t_2=4.3 \mathrm{~s}$ is at $x_2=7.6 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarterdf5kc08bfv ucvs2 1.)tmeh e2-mile ($1 \; mile = 1609 \; m$) track in a total time of 12.3 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 l7 pot54) won+/kzdl tzine, moving 93 m away in 9.7 s. It then turns o/4 p)ow 5ltzdzkn 7t+abruptly and gallops halfway back in 4.6 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 froe6 jokgs.8fek 8 ijy3ff; ic3)m $13 \; m/s$ to $22 \; m/s$ in 4.5 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 xgqbs - xba(4uq(kbtx,r82)g$16 \; m/s$ to rest in a distance of 80 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a iqd/z v0py,b;mvmw78,k s-dsspeed of $30 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.9 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burskfy0 ti+eur9l z 7wo+-t out of the blocks to essentially top speed abouteoi0 rlz7f+ +w9tuk- y $10.3 \; m/s$ in the first 12.7 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 o3ly k5yz7exb9 5i,0b)ck/+lw d drih sf $19 \; m/s$ to rest in 4.14 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 thef.viw(lv2dl y x0zxh* yi86cts5p7f( highway. Assuming a decelepl( cs7xixfzlw f*0 8vd25h(yi yv6. tration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck1f9hulr b ww(/k+kh0w ei(sy3. 9 dfmm 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/g , vcqhhq8e*. After exactly 27.0q8 hqhge/vc*, min, there are still 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?    $s$