Suppose that an object travels from one point in space to another. Make a compa17rh6qn0e*x9ro:ltwy 4 x tvmrison between the displacement and the distance travelrxmyeo1 * 6n 7hlt0r4:v9 tqwxed.

  When is the average velocity ofhce lrzn n( 2j/ ;:ynt2ctqb(. an object equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can b- 2jvub*f0u dgo "from zero to sixty in 8 s". This vu jbb0*fu2-d is a description of

  An object moving in the +x axis experiences an fn.an y,x3 lz)v sh/2 hm-;njgacceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x directionpj 9- l4.m/dvnph2qvq ) begins to slow down as it approaches a traffic light. Make/-qjn42vmpv qd p h9l. a statement concerning its acceleration.

  Suppose that a car traveling to the Westom + ,x1dy2gjjahy5y u4k q7q* (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning itsjdx a go27q4q5 m*kyhu1,yy +j acceleration.

  Suppose that an object is moving with a constant vhioy2 1ism, q5elocity. Make a statement concern1isy2,hm qo5iing its acceleration.

  If the velocity of an object is zero, does it mean thj vv. cp jj) y9n2 gd2el7v)o4f2cb.mnat the acceleration is zero? Support your .c pnv dof.2vj97mj)2ngy42 v cbe)ljanswer with an example.

  Can an object's velocity change direction when its acceleration is1hkv/s0 eht-j constant? Support your answeehskt-v j/h01r with an example.

  Suppose that an object is moving with consta;p bd0evp -xc-vl.:czx 9gi5b;znbi3 nt acceleration. Make a statement concerz5: bb -lp.90bii xzvc3-vd ;cxenp g;ning its motion with respect to time.

  Can an object have increasing speed while its accei 37br9 u1cbqileration is decreasing? Support your answer with anb3uribq971 i c example.

  Suppose a can, after an initial kick, mo8f. 4*7zqosqr eotlo9ves up along a smooth hill of ice. Make a statement concq.otol 9*zqorsf8e47 erning its acceleration.

  Under what condition is average velocity equa5mq) r;b/ioj5dd j,v8u 2jtaal to the average of the object's initial anad qu2 8btjir/;,m )jj55vod ad final velocity?

  Objects A and B both start at rest. They both accelerate at the sa:2 nqgazr o2 8tcz8v0)seusl: me rate. However, object A accelerates for ttzez2raqc:ss8l g0vu )o 82:nwice 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 fagz/j rfo v,e94dq0w 0rom rest. They both accelerate at the same rate. However, object A accelerates for twice thv9 dag ,w zqroef04j/0e time as object B. What is the distance traveled by object A compared to that of object B?

  When an object is releas/t4x bbl1ltsldwr :9 *ed from rest and falls in the absence of friction, which of the 1xl/ltlb9t*4sdb wr: following is true concerning its motion?

  When an object is releg-m8hr h0g8qwased from rest and falls in the absence of friction, which of the following is true concerninhghr8 -m8g wq0g its motion?

  Suppose a ball is thrown straight up. Make a statement about the velocity and srqi- of454odolwuwg1 e:+ n;the acceleration when the ball reaches tieudwr1f 4sn o-g+oqlw : 4o;5he highest point.

  Suppose a ball is thrown straight up. What is its acceleration jupw-gwjxd5 8;y88b cdb st before it reaches its highedwby-8 ;wpjb58 c8xdg st point?

  Suppose a ball is thrown straight up, reachll0mr- m g+l6 wq0 o2g5-avd z0qvzaw8es a maximum height, then falls to its initial heightv 0zlogr+ -l6z-85 qq2wagl0v0 mwmad . Make a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, re0u173ykeu *a w fg.t hi1uove6aches a maximum height, then falls to its initial he 6t7. ye0iagwfv3u*ouke 11 huight. Make a statement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is throfh. z/uxv; +iown downward in the absence of air resistance. Make a statement co fhoz.u+xiv/; ncerning its acceleration.

  Suppose a skydiver jumps from a higu: :hepi0irjalel -)drm6,s0 bn10th h-flying plane. What is her acceleration whe ltr6 )0,sn:-ilebiduhjpmh :er 0a01n she she reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identicq;f6y xd/ ih 8.e)lrxc:o;d vlal second ball is thrown upward with a speed 2v (twice as fast). xq:f o/r vi8 hy) dxld;c.;el6 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 first ball?)

  Ball A is dropped from the4zaa4+s 0h vls top of a building. One second later, ball B is droppeds0h+aa4l 4sv z from the same building. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One atzs xwf8em3 3wk9rx1l4oq su1+q1o :second later, ball B is dropped from the same building. As time progresses, the dim8 l3+o9szfkwaso:w4 1rx tu q31xe q1fference in their speeds

  Two objects are thrown from the top of a tall buildinh+c+( nhj 8s.+c kcsmkg. One is thrown up, and the o k .m+8hj(knc+ ch+sscther is thrown down, both with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from ths qb3s5bi 2 d2oil:vrv -y8x:ee top of a building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerationv32sqovx-ysbri 5:8delb i:2s of the two bricks.

  An object is moving with constant non-zero velocity in j drfha1/r; grk38 my/sysy(0the +x axis. The position versus time 8yhdr0ygjrr3s syf /k1am/( ;graph of this object is

  An object is moving with cons 2lrobd+-be2o tant non-zero acceleration in the +x axis. The position versus ti2l-r 2boobed+ me graph of this object is

  An object is moving with constant non-zero velocity in t 8;3 uodh.smayhe +x axis. The velocity versus time graph o a;.y8mdhu3o sf this object is

  An object is moving with constant non-zero acceleration ah4la zn, :/ bh0wgb*i nf-f:ein the +x axis. The velocity versus bhalaz*i/- fhe,g b0nw4 nf::time graph of this object is

  The slope of a position versus ua,b6y/mjar5* 3 f/zlbud/ ittime graph gives

  The slope of a velocity versus time grakmb*;p4 - q;zd 6ncsysph gives

  The area under a curve in an acceleration versus time grd*wz.bf,w wi0x 97 6kkpo;wr aaph gives

  The area under a curve in a velocity versus time graph givevh xq2-cs ,hl3g1-h+w8koym wi cr /2ks

  If the position versus time graph of an object is a horizontal lint(*f nbk7ht9py8 4irfq 7wn9ae, the object i4 w7q8*y9n(fhtp7t nark9bf is

  If the position versus tim q*s 2 c.q/qk+oo0dgzu-pl)kv e graph of an object is a vertical line, the object isv)qpc ko /20q- o +k*g.zlqusd

  If the velocity versus time graph of an object is a horizontal lig8qf9 2 mbiela +,dfnatid:c(xr6/ ,kne, the object 9 cd8iknm rg:fat(fxlq, ,6e di/+2abis

  If the velocity versus time graph of an objec3l 5ycyv 0pvci/nb t:7wl .qe8t is a straight line making an angle of 30 degrees with the time axis,3/. 75l v0qbey8:vny ci wcplt the object is

  An object moves 15.0 m north and then 11.0 m south. Find both thow.t xm 9lm +2.twpor+e distance traveled and the m xpmot w+9rw.lo mt.2+agnitude of the displacement vector.

  A boat can move at 30 km/h in still water.m n1ud5 llozcw;3g7y5-- fn4r ioqwm( How long will it take to move 12 km upslc3 15i(45-zl w -g w7mrydquoomn fn;tream in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609 me2p+68 (idbnep2ggf z 4sn7g a)

  What must be your average speed in order to travel 3ze7d yu+;b kdffi/) wxbs(r/250 km in 5.15 h?

  A runner ran the mari*x7 q qkp9c4eathon (approximately 42.0 km) in 2 hours and 57 min. What is the average speed of the runner in q*497q xkp iecm/s?

  A car travels 90 km/h. How long does itz n- x(duhjk0f: ye(+fdg,2rp take for it to travel 400 km?

  A ly (light year) is thq7j/clz xim0r w.01 bae distance that light travels in one year. The speed of light isx7.ai ql0r1 c/ w0jbmz $3.00 \times 10^8 \; m/s$. 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 ah(1lx va70j ,et.sx qv straight road and you look to the side for 4.0 s, how far do you travel during this inatten0 vx7 .te1(vlha j,sqxtive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, y6:rdac/adl r;qvli1 0 (*hzk xour average vel(;: 0 rrx 6zl*alc/vakhdi1qdocity is

  A polar bear starts atws;+i 3hnr-vi the North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, thew;rh+viisn3 - n 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 atl avej18ic x :x29fi ,bb2o)lk 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. e9 )2lbxlik8ij:f1 2c vbao,x 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 for7pv-gz;eyvz/ve 28qq 2goh aq /a(9 eh 110 miles. It then stv /g/v h ha(yq8- zpoe9v27zq 2qega;earts to snow 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 kdhztcc7,*q l8tc ;vm 5m at 80 km/h and 160 km at 100 km/h. What is the average speed of q ctm v5dc*t7 ,z8lhc;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 is her aver; zf9umbf 2f9eage speedmfu 29f9;fbze for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h north4v ivwmiho. ad16bf )7/q4ovz for 750 miles./ qfo ) o6vvdmw1vi74.bi4zha What is the average speed for the trip?

  In a 400-m relay race the anyn3)cj jd o48uchorman (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 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 3d4 yujojcn )8race?

  A car decelerates uniformly and comes to a stop after 1 d0 p1uwe 1rr4ndg7qd/0 s. The car's average velocity during deceleration was 31 km/h. What was thedd41u/0p dq 7reg wrn1 car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 /6uuc oi3h8uby5urd9m/s, at the average rate of ichy86ud u u9bo53ur/$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h acceleratog*tmc4;f ofm5 i68n fes 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 resa;p*xgnw 6 8rz)/zc uvt and accelerates 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 constant acceleratil+r 6c:qe6h4t in6e wjont6:i6jqc lw+e 6hn4re 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 6.0 m/s experiences a constantj9 -rqrdsn1te6 hd.j - acceleration o.h jqdtd r rjs1-n6-9ef $4.7 \; m/s^2$. What is the cart's displacement during the first 7.5 s of its motion?

  A bullet moving horizontally to the right (+x directi:y z g/yzqw0t b)jxl0-on) with a speed of 591 m/s strikes a sandbag and penetrates a distance of 27.40 cm. What is the x/0lt:gz y- yzw0q)jbaverage acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrier. It reau)4ha*j,j*v fs qvq)nches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming tha**n j)u4vj,hq)sq fv e acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with constant ateq0 /w 0lpq+scceleration 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 u:uv71lz wsb,yic ) fbp-cj94)9eaemto 80 m/s in a distance of 200 m. What is its average accelerationbe,):v1 csyfwzpb-j49 ia 9muc)l eu 7?

  An object starts from rest and undergoes uniform acceleration. During the firs+,wsw4k/a9w+iiyzkz s- ( ne xt second it travels 3.6 m.w+x(+wini9-/w k y k4z e,szas How far will it travel during the third second?

  An object is moving in a straight line with constant accele-zf-hn.q epi9w x,aem k *7nlr/q-6 arration. Initially it is traveling at 16 m/s. Three seconewe/ q.n plrnq7- f-r,* az6ha ikm-x9ds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates unifor,ym- zvmvt9k;mly 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 decelerat fes6;5pxwr lq0)r 5cwe 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 lq * z00wm9u guuc3vf9 /pd(phxenh1t0ight turns green, a car that has been waiting at the intersection starts ahead with a const c mup1qu 09zh9g/0xt0*e uwdp(f3hnvant 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 speedonqm19ztlhq+ iq0b ;3 we;u)p of 12 m/s on the surface of planet X where the acceleration due to gravity ieqlbzo;np 3 ;)qit9wmuh+q01s $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upwa :hmu*,rhfznsdx 1p:l1o7wz m w52wo+rd with a speed of 12 m/s on the surface of planet X where the o+*w unhp1m:5l ow dh2,zms1 7zrxf:wacceleration 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 sl,5 h:w+ouhe bhvq:y 6peed of 15 m/s on the surface of planet X where the acceleration ,yvh+ h:lqbh5weo 6: udue 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 plan *uxix1q*sh carbn9 vv f-84s.et X where the accelerationv*4u*hv8ac .fs bq1sr9-nxix 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 tz t*( lye o65:d2xjz4:k hmiqvhan 0.10 s. If your friend holds a ruler between your fingers and releases it without warning,y o2l*jxzik4z v5 d:t6:h(qme how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a vel+wfp(uy.u +gx0kw 0 rmocity of 19.6 m/s. What is its velocity after 3.x0fum+wwpgu(y +0.r k00 s?

  A bullet shot straight up returns to its starting point in 9 s. What is c 1)9fqj-m 1qy8dtitg the initial spe tmcq8yft-1i q 91jgd)ed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does82a o;0vuxg ig it take to return to its starting puiag2; g0o v8xoint?

  A ball is thrown downward from the top of a building with an initej09 c .gle8owial speed of 9 m/s. It strikes th9 cwoj8e0elg.e ground after 3.0 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s.may,9m4v ib sbjpjo/ 8gm*3: l (only fill in numerical value in the s98bpgb,34/ :lmimjv* oa jmy 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 spe;+djm :nob8l qed of 43.1 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 oo+( awk6msh+velocity at t = 1.0 s?

  In Fig. below, what ikuj 87:sdb/ 1qch w2jts the velocity at t = 2.5 s?

  In Fig. below, what is theu6c *wb1(, zu ns/lq v;sr3agm velocity at t = 4.0 s?

  In Fig. below, what is the velocity at t = 7giam0 ,z hq ,qia.kd25.5 s?

  In Fig. below, what is the average velocity from 0 to 4.0 3u:9opj wyy nt:cv )l4s?

  In Fig. below, what is the average velocityw kqc7,ww/0j2 bbt s8a from 0 to 6.0 s?

  In Fig. below, what is the accelerx 9wxam(ail-1ation at 1.0 s?

  In Fig. below, what is the accelerar6l/s) -bnf-2evn v0 gt:srjytion at 3.0 s?

  In Fig. below, what is the average acceleration frol4zh; o 3.k x*b.si 3ykzl)lnsxd vp+(m 0 to 5.0 s?

  In Fig. below, what is the avex1r,vacb3cey(e h.a:rage acceleration from 0 to 8.0 s?

  In Fig. below, what is the dia( dz6y) vf;fnknurseo0z.f(cnix- 0d; c-m3 splacement from 0 to 8.0 s?

Does a car speedometer measure speed, ve*4jw7*gtcu bl-w2j q wlocity? {speed|velocity}

  An object can have a varpj5 hl9 y(u 2sgb1q9obying speed if its velocity is constant.

  The velocity of an object can be negative when its acceleration ibwm2 ar mgec6c,0d3( is positive.

  If one object has a greater speed than a second object, the first mvc0b.ihw;i2 r ust have a gr ich 2iv.b;0rweater acceleration.

  Two cars emerge side by side from a tunnel. Car A is traveling with a speeo3erx q5v2,ixd hb,2bd 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 incre u zbvwo;e5/kqf) kq a4l6jn5-asing in speed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It leaves the bao 6zgj3s7: psrt with a speed :6rj pg osz37sof $120 \; km/h$. 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 , h+xceyi:ud yc r0y rw2cc.0.cj5 mx:happening to its acceleration, how doej5mi c. c+w.deur:0c y, y0 chy:xc2xrs it change if air friction is ignored?

  As a freely falling object speeds up8k-fxy j(e05+pv4xh 1zkl ssg , what is happening to its acceleration, how does it change if air friction CAN NOT be ignork5s8kl yhe p-xg+(v 4x0jfz1sed?

  An object that is thrown vertically upward will return to its original pneu +03f*a pc kzo4pz0osition with the same speed as3p0a zfoez k40n*c+pu 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 the same timeaax(0wi xb(o: .

  An object can have nonzero velocity and zero acceleration at the b0bxpuxup,x.gq) y 06 same time.

  An elevator moving from the second floor to the fifth floor559z5savav l g making no stops along the way hag5 vz95s vaal5s zero acceleration all the time.

  A rolling ball moves fbk o2sulc k23,r47jas rom $x_1=2.9 \mathrm{~cm}$ to $x_2=-5.0 \mathrm{~cm}$ during the time from $t_1=1.1 \mathrm{~s}$ to $t_2=5.3 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.4 \mathrm{~s}$ is at $x_1=3.2 \mathrm{~cm}$ and at $t_2=3.8 \mathrm{~s}$ is at $x_2=7.2 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight comph41hgo85o28nq7 jz/a gubqnh qu+sc 8lete laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 6.3 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 line, movip*,fm nc* kj*diek9r. ng 115 m away in 11.0 s. It then turns dfr*nmp *i cke.*j,k 9abruptly 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 from .hlurr wr9qyx0/lm25mhi* :o$12 \; m/s$ to $24 \; m/s$ in 5.1 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 from e7;mi3 :guj7or* alwh$19 \; m/s$ to rest in a distance of 77 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must rmac qv(7hn* ,meach a speed of $32 \; m/s$ 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 burst out of the blocks to es1tlw p 4wz,r55vx- cqosentially top speed abou 4rxtwl5,pcq v51-z owt $11.0 \; m/s$ 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 oq2;pdv9 yor,6 mf6ss5ll /pyn f $18 \; m/s$ to rest in 5.80 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves s3uu4qy*:(y9kt mw gv mkid marks 92 m long on the highway. Assuming a decele guk(3yym:9*wut vm4q ration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goingiedj38 14+ kxc1plid 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 complete the 10,000-m run in less than 30.0 min. After exacpm )hj;3uathlpi f 07 .et5k(d2pa1 uztly 27.0 min, h.pj;a2tu a5pe lzk0d71mf3i)pt(u h 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?    $s$