Suppose that an object travels from one point in space to anbu: 8v+l geynq,w(m1xother. Make a comparison between the displacement and the distance traveled +ye(1 qlnm, 8wgxuvb:.

  When is the average velocity of an object equal to the instantaf*swhid7-9 wt6u xfkrkz2h3 -neous velocity?

  A new car manufacturer advertises that their car can go "from zero 9rr;q8xcp4( ;/+ po xur rtiibto sixty in 8 s". This is i xrq;pr(c/9+i;84bur ptxora description of

  An object moving in the +x axis experien-lum6 j *sgxk-ces an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to slow down asyrj i53 ;ui),- mgb*yrgu*htb it approaches a traffic light. Maj3r * u ihb-mibry5*ggtyu;, )ke a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) bega twlodw 3g7;/ins to slow down as it approaches a traffic light. Make a g3lwt7;ow/adstatement concerning its acceleration.

  Suppose that an object is movi k-mk)hw8:j:p)y qka m3gxxzds 7j 72fng with a constant velocity. Make a statement concergh:wsk 3x pj7m:7 )f 82z kqdkm)ja-yxning its acceleration.

  If the velocity of an object is zero, does it mean that the accelerat9cyw 1fn4zsj 1+idz u5ion is zero? Support your answer with an examp1uf+d4z9c n5y iszj1wle.

  Can an object's velocity chans:3c0n /vdfzxvl4t i 4z2u+n kge direction when its acceleration is constant? Suppor+ kznvtd sl /23iunzx0fcv44:t your answer with an example.

  Suppose that an object is moving with constant acceleration. Make a statey4o1 m6.fr(w7 xb/n h)ipjqdlment concerning its motion wixw4d 1rmopbl)j .fqyn( 6/i h7th respect to time.

  Can an object have increasing speed while its ;pqew 9 bb,0o*lpd*daacceleration is decreasing? Support your answer with an*padole wb,d *qbp;0 9 example.

  Suppose a can, after an initial pdat 2g1h15b eim ga/ +d1+fc8jkas i1kick, moves up along a smooth hill of ice. Make a statement concerp1d e 1+/d+ibgs2ijg ha51k81f matcaning its acceleration.

  Under what condition is average velocity eqbjd efd xk/e(lk;z (:3ual to the average of the object's initial alde jz/ kf( b;k:ex3d(nd final velocity?

  Objects A and B both sta93tfjz fe (f; piszj3+rt at rest. They both accelerate at the same rate. However, object A accelerates for twpi;e+ zs9t(j3fj zff3ice 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 bopfow7-ow.-:db si m0eth accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by objw bpio0df -7: mwe.o-sect A compared to that of object B?

  When an object is released from rest and fally,)-q (a9fpj 6pw baz8xedt o7s in the absence of friction, which of the followpjb 69a-)w xoatzpfd ,(e8qy7ing is true concerning its motion?

  When an object is released from rest and falls in the absence of friction, whicj6q*/ zwy zmem7 3((.zhvwi g;er3y nttvk1d+h of the f(3+ht n1v/q 6yzz jimyezwkw .v *re;dm(7 t3gollowing is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the5uc(q r)a:ckn g2rq*6sdz*q l velocity and the a urglqcd2: 6z*5q*)rsqnakc(cceleration when the ball reaches the highest point.

  Suppose a ball is thrown straigh8. z/sni1rmf zt up. What is its acceleration just before it reaches its highe1z i.sznmf 8r/st point?

  Suppose a ball is thrown s2bcp g ln vml8/km.d61traight up, reaches a maximum height, then falls to its initial heightng8km/lp1v6. 2b dclm. Make a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight asjy q6dj03 )dwts/m 6up, reaches a maximum height, then falls to its initial height. Make a state/dqst)0sj a y3m6j 6wdment about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the ;6gai )3+av0ljp fvsmabsence of air resistance. Make a statementj3l6f 0sa+gp)i ;a vvm concerning its acceleration.

  Suppose a skydiver jumps from a higu c*4*9rqu8z1zd- omw7wfsmw h-flying plane. What is her acceleration when she she reaches terminal velociu uwsc mzmd9w41rf8w *-7oz* qty?

  A ball is thrown vertically upward with a speed v. An ib *5 fg/ox)hdhd*.lt4dj0u yqdentical 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 fir **lxtyddbh q4 fgud)o0j/5h. st 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, b+txa(ota w7e0all B is dropped fr+o t xe0aat7w(om the same building. As time progresses, the distance between them

  Ball A is dropped from the 5o-ons*v(+jtiawf8*t0 bx de top of a building. One second later, ball B is dropp n(5 -*aos+wtexbij*f08votd ed from the same building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. On7s+ bd*n oxrw/e is thrown up, and the*/bo x+nr w7ds other is thrown down, both with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick is throwzqrvy -p9vqa2 4a 0p v8k4bn.dn straight down from the same building. pq4yvbd0 -v 8q29kvr.aa4nzp They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero veloci/h /hc,us (yslkbn7,/v,ishity in the +x axis. The position versus tims,7,skh i huy/(l/vnh,si/bc e graph of this object is

  An object is moving with constant non-zero acceleration in the +xu6l a9f+y/ im3lqw+q k axis. The position versus time graph/mqwuaf3ll ++6yq9i k of this object is

  An object is moving with constant non-zero velocity in the +x axis. The ven3;oz jjn1 jv8locity versus time graph of this obje1v;o3jjjz nn 8ct is

  An object is moving with constsx)ocx:me;;4mf z h9a/( o pjqvvp,/iant non-zero acceleration in the +x axis. The velocity versus time grsj/;4p)(e,oav p cfzi mq:ox9/v;mh xaph of this object is

  The slope of a position versus time graph giveyho(uzj q3 ,e5s

  The slope of a velocity versus time graptot)- h np:yei,z :zn-h gives

  The area under a curve in an acceleration versus tim/qvn6 h.c,xth t*-utf b6 8ucue graph gives

  The area under a curve in a velocity v0trbu8 7xn aq6ersus time graph gives

  If the position versus time graph of an object is a horizqb97)m.t s ngeontal line, the object 79m )eqtbsn.gis

  If the position versus time graph of an object is a vertical li6 .jnsxqd+pl3o1 k;sdne, the object isq6k 3;lsdnjpd+o1 s x.

  If the velocity versus time graph of an object i2kgm uzju/o;1 ):bg cds a horizontal line, the object ijkoubc :/2)gg md1uz;s

  If the velocity versus time graph i :xw8m(n5 y5na5hswl,xg6udof an object is a straight line making an angle of 30 degr i ly(8ngx u6awnm,55 w:hd5sxees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the distanxlhou *+8c n8jce traveled and the magnitude of the d*+ cuho8j8n xlisplacement vector.

  A boat can move at 30 km/h in still water. How long will it ta2 rv;(c.pwdu yd2fks(d, z)jj ke to move 12 km upstream in a river flowing 6.0 km/cdyufs ,dw( r v)2(.d kz;pj2jh?

  55 mi/h is how many m/s? (1 mi = 1qk 8 fzdc.28ta:f 7xwf609 m)

  What must be your average speed in order toap *u0x0baoq4j7ob v7 travel 350 km in 5.15 h?

  A runner ran the marae9zb+)h fv2 ezthon (approximately 42.0 km) in 2 hours and 57 min. What is thvez92 )ebzh+ fe average speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to travel 4006i;.mjslp ps 3 km?

  A ly (light year) is the distance that light travels 1k+c*q-55d xzssphroin one year. The speed of lig5so1h kd5c- pzxr*+ sqht 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 al k70olu z mn 1z4qhdxh/**:qavv9brt -ong a straight road and you look to the side for 4.0 s, how far do you travel during this inattentive p*lh q7h:0kv1*m bzxatduov 9qr/n4z- eriod?

  If you run a complete loop around /c w):6l cys()6kmgkzvrqw/qan outdoor track (400 m), in 100 s, your average velocity i6c vl/mq: /s6 g)qkw wc)rykz(s

  A polar bear starts at the North Pole. It travels 1.0 km south, 1utu)49 tb erfthen 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 thf91 rtb uu)t4ee bear's average speed?

  A polar bear starts at the North Pole. It travelse zla*apfjc+0l( dd2y)./s ch 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. This trip takes 45 min. What was the bear) le+ z 20dsfjl/ypha*a.(dcc's average velocity?

  You are driving home on a wc :h+4qh5d) tnt;/ n1wsf qbejeekend 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 and 15 minutesf/jt 5nqw)bdehqs;tn+ 1 h 4:c. 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 tib14(9 hw)7b cp ykivghe average speed of the ghvw)i4ypbi 7 1b9k(cmotorist for this trip?

  A motorist travels for 3.0zy-94, ahu emnr2g e,ryi75xz h at 80 km/h and 2.0 h at 100 km/h. What is her average speed for the tn hzr7 ug ixmz29ye -a,y4r,5erip?

  An airplane travels at 300 mitai )gw94 r2fx/h south for 2.00 h and then at 250 mi/h north for 750 f)94x2r iwatg miles. What is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs th3 gkk+ni8:j /umi+znte 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, it+zn/:k8+ mi3kgijn un order that the team A runner not lose the race?

  A car decelerates uniformly and comes to ak**a1 knv5ebjkc1f5 6qc9ep j stop after 14 s. The car's average velocity during deceleration was 40 km/h. What was the cb*kk5qc1 6 c1jene 9pkav *j5far's deceleration while slowing down?

  An airplane increases its speedoq+ q +8i.ra.rb.u xd( fh/ t-htnh/td from 100 m/s to 160 m/s, at the average rate of aqfob -r/ .+(hnr ttuhiqd8/x..dt h+ $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the h ef81bcmip 8jo.p3rxv-s y0(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 acceleb )..gqegfbt dxw753 erates 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 fo v-xyl i)2)2t iobq auow;8us(r 10 s. It then speeds up with a constant acceleration ofw8y i 2atbluovqx)o(s i-)u 2; $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 1.7 m/s experiences a co8dq(cqg+4 o jsnstant acceleration of cs(gq4+oj8qd $2.1 \; m/s^2$. What is the cart's displacement during the first 4.9 s of its motion?

  A bullet moving horizontally to the right (+x direction a,j 1i1c/ei/ n-6fbpspy*ipf) with a speed of 460 m/s strikes a sandbag /p1*,ibfie 1nfyp-j6 cisa/pand penetrates a distance of 81.69 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched frq/)n8 h* i4tufk(kxv yom a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is constant, whfvx4k/ q*i nt( k)u8yhat is the length of the catapult?

  A car starting from rest moves witht 4z *mo t/3l c5sk-5e0onfmbe 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 tphvr, voq-3:n 3*/ osxen,v6h;rg lyko 80 m/s in a distance of 200 m. What is its average acceleratioln er6/-* v,vrvh; oxpk:nyq,3h so3g n?

  An object starts from rest and undergoes unifol(t yluhe8t )s 1i:l7crm acceleration. During the first second it travels 7.2 m. How far will it travel during the third sh:ltl yl8e 1(ut7)sicecond?

  An object is moving in a straight line with c lyr nfwqx1x,bx:c/vf)kg u(a2-3b l7onstant acceleration. Initially it is traveling at 16 m/s. Three secolr fxf xayk l3:w/cq17) (2bu ,-bvnxgnds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates uniformlk.tgp/ nvrm h .1afx44 ;b8kxzk8xi*ly 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+vex b3-eb:xim3 f) z j;zi)yz 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, a car that has been waiting at thaxzx4)/g4i s mog6q.ge intersection starts ahead wio4gxga6i sx)./zm 4q gth 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 u+*o rhio4f7nh+ef+9qh( vu ogpward with a speed of 12 m/s on the surface of planet X where tf(hoguhfh4 ri9 qe7++*o+ nvohe 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+rg9g.ey pis./*ce j l m/s on the surface of planet X where *+g l p ry.e9siegjc./the 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/h95zf- jdnwoktt8p xr3z l+).s on the surface of planet X where the acceleration due to gravity jz+hnkz -wtldr) .3 9poxft85is $2.5 \; m/s^2$. How long does it take for the object to return to where it is thrown?

  An object is thrown upb1frf1ss3p 1b,u3f3 vb 5y0c c2kkfml9to/hrward with a speed of 14 m/s on the surface of planet X where the acceleryc 3m r1b9o1fsfk2b1,t/3fv3hlfs 5 0ku rbcpation 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 h;o+n m z8p01+x agpkgqolds a ruler between your fingers and releases it without warning, how far can you g+kzo pqp8 a;0ngm+x1expect the ruler to fall before you catch it?

  A ball is thrown upward at a pxk,/,wsnle n m,: jh5velocity of 19.6 m/s. What is its velocity after 3.l,n wnhj5s xp :,k,/em00 s?

  A bullet shot straight up returns to its starting point in 11 s. What is th6d0;1yr t qvtt r7ihl8e initial speed of ttli rv706;d8q tryh 1the bullet?

  A ball is thrown straight up with a sp07tb 6ja ro;roeed of 36.0 m/s. How long does it take to retab60jtrro;o 7urn to its starting point?

  A ball is thrown downward from the top of a building with an initiad0jdnc8 2zq)x l speed of 5 m/s. It str nxz8d)qj2d0c ikes the ground after 6.6 s. How high is the building?

  A ball is thrown straight up with a speed of 30 j1, fs; 3gi(j iajfmn3m/s. (only fill in numerical value in the(1,mignj3 i; ajs3ff j 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 strap,47j8 x ijotaight up into the air with a speed of 43.8 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 13 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 13.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the )g0n;.puzrrbm4, tol 31yzcuvelocity at t = 1.0 s?

  In Fig. below, what is the velocity at td4 i 2y1flxug3 = 2.5 s?

  In Fig. below, what is the velocity at t = 4.0 s?vfuqf (wj 1hg8y0 i(.h

  In Fig. below, what is the velocirstzp. v a9mz2majcuh9x 5p:,(0og z0ty at t = 5.5 s?

  In Fig. below, what is the avero gfs0k7 rj9)ks3ydiw1 xh (.xrsm*;kage velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 to 6.0 pin:8f hg0mxu lm,o;vfk0 ,-ys?

  In Fig. below, what is the acceleration rnlot bden)74 k/ua6 ;at 1.0 s?

  In Fig. below, what is th)j(l t gbonktc+;z 72ne acceleration at 3.0 s?

  In Fig. below, what is the average acceleration from z8; h: 1inavx x4f) yptts.-jy0 to 5.0 s?

  In Fig. below, what is the average accelexfnqc / p;o:wcq*0*n qration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 to 8.cjw0ev k gi3m7c ( 1ti.t6iay(0 s?

Does a car speedometer measure speed, velocity?1.ew. x9umi2 v2avvvs {speed|velocity}

  An object can have a varying speed if its velocity is con-ztsk ;b u+4cu20idqyvj so 6-stant.

  The velocity of an object can be negative when ,6(cmtphegt)s; m9a8r4yxgs its acceleration is positive.

  If one object has a greater speed than a second object, tb4h4eebvm /l lh1s v-(he first must have a greater accles -hbvvh1em (b 44/leleration.

  Two cars emerge side by side from a tuf p c/d3be0e p0nq6+sfnnel. 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 inc- acd 0p(ez-vnvbkz 1)reasing in speed as its acceleration decreases.

  A baseball player hits a foul ball s7t(0+ilfnxv*a 6*kbc bkyrlho6o8 jmvu g - ,)traight up into the air. It leaves the bat with a (iluv7h ky,c**)rjb-vo 6oaln+gbmxk8 6ft 0speed 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 objecol f6yl g0rc5.a, r4rqt*r:urt speeds up, what is happening to its acceleration, how does it change if airrlrfrr:r,o 5l.c6a uy0g* 4tq friction is ignored?

  As a freely falling 7hwj e1*r. n0qjun; ryobject speeds up, what is happening to its acceleration, how does it change if aiynw.7r jn0jh1q u ;*rer friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its original p*ftna peu fay+6(fl .8osition with the same speed as it had initially if air resistance is negligible. If air resiyfaf fea8+un .(lt6p* stance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration atufm s l9bwp+c:cii :-1 the same time.

  An object can have nonzero velocity and zero acceleration at the sams )qku yd-:m+vg bhn8/e time.

  An elevator moving from the second floor to the fifthh,5bpg3d k0;bxqa1fr floor making no stops along d1frb5 ,0p; aqg3b khxthe way has zero acceleration all the time.

  A rolling ball moves f1:lp+bzo+mkc 1k w/3t4e xutbrom $x_1=2.2 \mathrm{~cm}$ to $x_2=-5.3 \mathrm{~cm}$ during the time from $t_1=2.3 \mathrm{~s}$ to $t_2=5.7 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.9 \mathrm{~s}$ is at $x_1=2.3 \mathrm{~cm}$ and at $t_2=3.9 \mathrm{~s}$ is at $x_2=7.8 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps arfknlb- h (bk5xq yj;. ufb2wl0yf)1s4ound a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.7 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 line, moving 110 xb o)yxs,z)9q m away in 12.7 s. Itx qsybox,z)9) then turns abruptly and gallops halfway back in 4.8 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 fromovhl3f3xyqd;*z g 68y $12 \; m/s$ to $23 \; m/s$ in 5.6 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 /rie1k5*r suqn;e 6c k$21 \; m/s$ to rest in a distance of 68 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a gc;ay5xd9hj6 snt4 .vspeed of $27 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.4 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the5c4y; 7qu oqf trgm1cy5f4 x9gkr-/u j blocks to essentially top speed about qgcx4- yfrkfo;m4u5jt/r5cu9 gy 1 q7$10.6 \; m/s$ in the first 11.4 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 42vcp xqvy94wof $19 \; m/s$ to rest in 5.97 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 the highway. lj,zor jm ogns1 +(qp25bu/p4Assuming a deceleratio2jg1np+sl bm j4 r5,qu( oz/pon of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a tr9pa-cd cki zjj:c2,( zuck 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-mwbnpnl50y 4b+3 w3hwoigh2 b;3tv*lj run in less than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner must then accelel3pnb g+jho42w iv l3wn0 ;5* b3thybwrate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$