Suppose that an object travels from one point in space to another. Make a comwawxv eh 907lfp.lag-zaz- ss9 fw.o3l-t 4 (gparison between tl(wpw. -.slog4t 9f0f 3 vs7x--al z azeha9gwhe displacement and the distance traveled.

  When is the average velocity of an object equal to the instantaneous aqbo6lhjm(h :xxp0xypz9, 69z n t0r -velocity?

  A new car manufacturer advertises m : 59qtc9bmetthat their car can go "from zero to sixty in 8 s". This is a description of9cmm5q t et:9b

  An object moving in the +xfl)u4 obw aj82 axis experiences 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 as q+vogkm n)urkv )ma01e )85xfit approaches a trafn)vfkmo 01 ug)xea+v)5 rq km8fic light. Make a statement concerning its acceleration.

  Suppose that a car travelintsimlrr6:z +b y /cft*d fpk29(1x/ p9plye4zg to the West (-x direction) begins to slow down as it approaches a traffic lig 1/ekz+z9rtpptm(yp fc b:xifr */l sly 4692dht. Make a statement concerning its acceleration.

  Suppose that an object is moving witb-pvgi8 -,ouz4dlas(gt0 xu : h a constant velocity. Make a statement concerniu -db(0sglau t :iopv8,4x-gz ng its acceleration.

  If the velocity of an object is zero, does it meqe83cyslp ;0a an that the acceleration is zero? Support youl03yep8 cq; asr answer with an example.

  Can an object's velocity change direction when its9ccd/6ney ep4h*y7d q acceleration is constant? Supportp74he q9dc*y /d en6yc your answer with an example.

  Suppose that an object is moving with constant acceleration. Make a statemenqsqyd+ p9s 02w3 by6 6v5iutbnt con b+5i2pyvqsnqs 6dy60uw 9t 3bcerning its motion with respect to time.

  Can an object have increasing speed while its acceleration is decreasing? Supw eofmn pmn+bs8,;*rj53 .w f6mo1mdsport your answer with an 1n.j s;fme md+ p*onf6wb,m3wos8 m5rexample.

  Suppose a can, after an initialz f b*ucf b1vhsr,+b7- kick, moves up along a smooth hill of ice. Make a statement concerning its accelerationbh,b 7+zcf rbvf*s-1 u.

  Under what condition is ave .7me 3wjt* g5whld3xbrage velocity equal to the average of the object's initial and fi.mgx3*lwt w375bj dehnal velocity?

  Objects A and B both start at rest. They both accelerate at the same 9j 0/ pc/tpbhnrate. However, object A accelerates for twice the time as object B. What is the bc /np0hptj 9/final speed of object A compared to that of object B?

  Objects A and B both start from t.jtt;8ctz1zaq3 y;vifq99 u rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by objec yqtc38;jt.zv1au;iz9 9f qtt t A compared to that of object B?

  When an object is released from rest and falls in the 7k 2kr ixfx3pw l5m6qjw7m58k absence of friction, which of the fol qw7xmkikm5 k62xf73 5wj8r pllowing is true concerning its motion?

  When an object is released from rest and falls in the absence of femc0pq6mf 1) kriction, which of the following is true concerning its motioqc)mkp6e0 1m fn?

  Suppose a ball is thrown straight u1 3zn 786-i5i n)mhso 1nnspkohda zl9p. Make a statement about the velocity and the acceleration when the ball reaches the highest point.a1ln397s6non)mk5-1zpoh 8s ii dhzn

  Suppose a ball is thrown straight up. What is its acceleration just betbgf(sdvfc02w u(z )+fore it rbdcf) g f (s+uzw(vt02eaches its highest point?

  Suppose a ball is thrown straight up, reaches a maximum h9bbdzivtmd)75/ar da8 2jss *eight, then falls to its initial height. Make a statement about the direction of the velocity and acceleratio8 r d2js9iz)aba*/7tb5d s vmdn as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then fallsgq)p)trd+ )b1n3de;-gbhbjk to its initial height. Make a statement abobe)qkd;) jgrg b pd)h+3t1nb-ut the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence o(fsh7.cfab a4 f air resistance. Make a statemesh cabaff4.7( nt concerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is /b1g79p v ecrbher acceleration when she she erbvb19g7 p /creaches terminal velocity?

  A ball is thrown vertically upward with a speed v.ko4 qf (1g -:8y;cw.frppmqq n An identical 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 first ball? (How many times higher does the second ball go than .k m qp1 fq4(:q;p-gcor8w ynfthe first ball?)

  Ball A is dropped from the top of a building. One second later, ball B mhxk*f )-;tg(rjg+c/x fq l7g is dropped from *g;t-)+g7cr xmjlfg/hfq( kxthe same building. As time progresses, the distance between them

  Ball A is dropped from the top z9qblvchlsx3+ /n5 y*yq+ g9od ; ju*nof a building. One second later, ball B is dropp9ld3*qxusj +q *+czog5bh ;ny/vny 9led from the same building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is thrown upe gxqt+ f hd h)4(e*jea-+ .d(wxaed,u, and the other is thrown down, b(*jegex (d)hefd +t. 4q xeauhw,-a +doth 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 sect(4w vm 1)zzlk :tddf7ond brick is thrown straight down from the same building. They are released at the same t(v tkd1 ltzwz4:d)m7 fime. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axgq .(ncht+me -.ng.r ,zwfb0ois. The position versus time graph of this .e cf+wo (mnt,h. -nzgrbqg0.object is

  An object is moving with constant non-zero acceleration in the +x axis. The pozwo/ w xeo)17ysition versus time graph of this object 7oz)xwy/1 weois

  An object is moving with constant non-zero velocitybg2mzngvpx8d: ;y 3k -vv0u9 i in the +x axis. The velocity versus time gravivn8: v;um-y02d zxggbkp39 ph of this object is

  An object is moving with constant non-zero acceleration in the +x axiomku l7 *;qz 5((g- nq8vvvn/pyo(mvrs. The velocity versus time graph of this objecoq*yvg7 v-(( z/p o qvurnvkn(58m;lm t is

  The slope of a position versus time graph givesu9d4oa)r3fy i36v* dd e dpv0z

  The slope of a velocu;hzh 6i/ppnp t)i0 fap o3e1nn:52aaity versus time graph gives

  The area under a curve in an acceleraz6 f 6lg:zkxwdzbh67s f.x19r tion versus time graph gives

  The area under a curve in a velocity 3w (/qvrk /lp, q0jx2rkicc ;jf7h. 6 j:qyjcdversus time graph gives

  If the position versus time graph of an object is a horizontal line, the obj*t9b,fus7f4fnon 4 lgect ouff*f 7tg n4l9 4bs,nis

  If the position versus time grm y 0s8*fi9mjg5-otpxaph of an object is a vertical line, the object istj5 80opmx f*s-9mg yi

  If the velocity versus time ub0s.cm7 a af*pvk,d-graph of an object is a horizontal line, the object .a - um,p0b7avdsc *fkis

  If the velocity versus time graph of an object is a straw )q,fa 1xekz(hp65nljak1x xci(p97 ight line making an angle of 30 degrees with thcp1lef1 jn,h )6x((awx xkqpaik75z9e time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the dis3e hh01.md ccan,klrp 0f( 8qw xjwk)4tance trave8(k cw,ncr3w )mk1jxl hh0a04 fpdq.eled and the magnitude of the displacement vector.

  A boat can move at 30 km/h in stbn lwj(m( jz+l 15r.svill water. How long will it take to move 12 km upstream in a river fljjll(b (n1s zr+mw .5vowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi*9ofsehz: e np+ky -pl6jt0,g = 1609 m)

  What must be your averknk2o+ fab j29jc5 pc -mm v*m5+gvmz7age speed in order to travel 350 km in 5.15 h?

  A runner ran the mara,v wuk3olsc: 9bn ta1:thon (approximately 42.0 km) in 2 hours and 57 min. What is the average spee 1bl ,usn3owtv:c:k9ad of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to travel 400 kmef 217riolgi1 ?

  A ly (light year) is the distance that light travels in one year. Th; ,,torq r;lwj btfn .m4d.owt+ul, p6e speed of ligmqotj,ortduf6l;p .;lbw.w , tn 4+r,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 look to the side fpkk o*/uxpe00 or 4.0 s, how far do you travel during this inattu0/pokp0* xek entive period?

  If you run a complete loop around an ouz/) ofp0w/(rujgi;;m72drvg h6 pokdtdoor track (400 m), in 100 s, your average/7z kp rwfg 6) j0d (2gorip/;mduoh;v velocity is

  A polar bear starts at the North Pole. It tycdxuw4(y0 frx;: i+ek4a 7iwravels 1.0 km south, then 1.0 km east, then 1.0 km north, t+:ce4wr;wy x7 idi uaky4 (f0xhen 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 trpnh5e/p 0snf+z) 5*u*5hljcw ka a4 hvavels 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 bf)4j*0n5 +lva/e*hk 5 zus hp5a wcpnhear's average velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 miles. It th.fa a5gqao;0mzb (.5ymqz3uc en starts to snow and you slow to 35 mi/h. ufqz(ac.ma5z o0amq35by. ;g 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 10v*.9:zgbw/ +xqsjs il0 km/h. What is the averag+9b igjx v :/ssz.lqw*e speed of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h atkjs2an38/ )iucer2c x 100 km/h. What is her average speed2x2 a s nju)r3ecick/8 for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h noryd;)c rac7d) rth for 750 miles. What is t r7 dd)ryc)ca;he average speed for the trip?

  In a 400-m relay race the anchorman (the person w(p -/miwv.pd tho 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 lar(.d /-tmvwp ipgest 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 uniform6 x2z;ijr * qrylle-kro- t/m)ly and comes to a stop after 13 s. The car's average velocity during deceleration wamlky) 6- izr r2x-/ ot;rql*jes 36 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 mq 3 -x+krgs-go/s to 160 m/s, at the average rate of rqs x3g+-g-k o$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h acrk/g 1h-yusm9o66in tcelerates 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 acceleratesb c* 8ml sb4e,-ppojh+ 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 tk0a 9efgf35 l (liup)j 5.rktehen speeds up with a constant acceleration r3(k a 0jet5flp5i fgl.)keu9of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 4.2 m/s experiences a constant acceler:tji1 qew+u+yation o:yu ew q+t1ji+f $2.1 \; m/s^2$. What is the cart's displacement during the first 6.9 s of its motion?

  A bullet moving horizontally to thej x ,8s szke3uo)fuoc,*z/ *s+4bkis w right (+x direction) with a speed of 405 m/s strikes a sandbag and penetrates a distance of 69.18 cm. What is the average acceleration,jxuoswk fbs4s*u8 zkic3*z o,,)es/+ in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraftd q-of7 r 19(2 .uajzqjvjo6xe carrier. It reaches a speed of 42 m/s at frq1jq 2zjj.eu6xod-(o a v9 7the 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 move0te:2 8 w:w puil.f3xz6nmmi ks 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 20yse - gpg /8aolt(y,4o0 m. What is its average accel 8ga/ 4g oyo,eps(tly-eration?

  An object starts from rest and undergoes uniform acceleration.f9dd x(k1 x(0gwzm eu) During the first second it travels 6.0 m. How far will it travel during the thizf0e1(( gkd)9xd uxmwrd second?

  An object is moving in a straight line with const 7ld5owklhysb r,1/z3ant acceleration. Initially it is traveling at 16 m/s. Three secolr wd,3sl 7k1 b/y5zhonds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates uniformly atv .wng q-5gp6g $3.0 \; m/s^2$. 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 ag qrd.aoi.54 wt 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 kvo:s;j e3x; d y,dcp(turns green, a car that has been waiting at the intersection starts ahead with a constes:xp; ,3vd; d okcjy(ant 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 tfcyk8 2k19oy speed of 12 m/s on the surface of planet X where the accelerati8y ty ko91f2ckon 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 m/s on the surface of m hqj2w,m 1h7 ury6;ltm7 s- 2afxt9rmplanet X where the accelemfj12 x6tl,a2y;mrh w7 m q9m su7r-thration 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 surface of plad.fq sww3 76kanet X wherew 3qk 7wdsf.6a the acceleration 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 enskb6dgz f-0c 7.ctk j/j;x9surface of planet X where the acceleration d - jx9jdf .cgbe 0kn6s;7/ztkcue 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 g-a76 ymty4p)sdp) u+ahv,: ao-a zmg s. If your friend holds a ruler between your fingers and releases it without warning,pa+d7zy)6 -m-o)h4 vut a gysp,agma: 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 velocb cr+kx5 ;pf t40ylcuy .y26ngity after 3uyxr p5+c n4gk;yylc6.tf 20b .00 s?

  A bullet shot straight up returns to its starting point in 6 s. What is the in bd1q;rj*8jzf1zcj 9eitial djzc11j8q9rz*fj e ; bspeed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How omsqa3gtmg8 sm3f+3+- xakn2 long does it take to return t23a ++kftg3oqmmn38 -ss a gxmo its starting point?

  A ball is thrown downward from the top of a building with an 4*- o dxpq0;fr .fahcqinitial speed of 22 m/s. It strikes the ground acq 04dro;p*. fhqaf x-fter 6.8 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numeric/go4eqihs;:x xkooaf q 3696r 6+xt hn,oa(nyal value inh;y(x:rha3 6t9 fe +aoo6g,qkooxxsn4q/ 6in 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 the air with a speed of 23.7 msuxl n, qwr a7,5qr,+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 1 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 t)c:bs7n wmkcfp)7;(/4bjkx g w1 vemshe velocity at t = 1.0 s?

  In Fig. below, what is the velocity at t 09 )g t2y0ys6-eyy+q wnzk dmr= 2.5 s?

  In Fig. below, what is th ;pvi2o7 43;2f+ap ysyhe(pquuqa2r je velocity at t = 4.0 s?

  In Fig. below, what is the(1n-bj+y k pfl8srn0gc6 s7us velocity at t = 5.5 s?

  In Fig. below, what is the average velocity from 0 to 4.0 s? g8(+pwi d2cf1azd( hz

  In Fig. below, what is the average velocity from 0 to (:*owjw :auqg 6.0 s?

  In Fig. below, what is the acceler/nvqg 4avh uy 4*9nevfy .+eh-ation at 1.0 s?

  In Fig. below, what is the accel65g60nmgrx :x7m ksjb eration at 3.0 s?

  In Fig. below, what is the averageuktlj 08sx 6rq;: d.ps acceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 to 8.0k e9x;, o:peqtvpnt4u3+j4 ug s?

  In Fig. below, what is the displacement from 0tu,ebev+e3/o ,sc 3kq to 8.0 s?

Does a car speedometd4yd4h. (t ;yej:mxuk er measure speed, velocity? {speed|velocity}

  An object can have a varying speed if its velocity is constan8wro szg.e 9q6t.

  The velocity of an object can be negative when its acceleration is positive+o 5nf5fbopx+p,ci j4 .

  If one object has a greater speed than a second object 2p0bl rsi0zb;, the first must have a greater accelerati0ibp z;2sb0 lron.

  Two cars emerge side by side b+lmfd pe 6:0)qth:z2/happv*o5cs sfrom a tunnel. 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 its accem9f pjm d7c y3r/xo9z(leration decreases.

  A baseball player hits a foul ball straight up into t (jkhfk68vk0zrznc61b d8+: h v0ukt ohe air. It leaves the bat with a spedrnkv(hf j:k+tubz0886 oh1z 0kk v6ced 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-,d2g vt (zuk0k 7bapr up, what is happening to its acceleration, how does it change ib0,(dtr2 7 kza -vkupgf air friction is ignored?

  As a freely falling object speeds up, what is hapybe q1u8bw8 rdsn,3kl1q -g;o /cxe+hpening to its acceleration, how does it change if air friction CAN NOT be ignorn1ek3g-;/+yb uc1qbx8e,8s o h q wrdled?

  An object that is thrown vertically upward wil0x pi/u5yny w(g :9ceel return to its original position with the same speed as it had initially if air resistance is negligible. If air resistance is n (5g:0eei/w 9cyuyxpappreciable, how will this result be altered?

  An object can have zero velocity and nonzero accewz;hgs0ckg/uwo g;m u9 k/ s;0leration at the same time.

  An object can have nonzero velocity and zero acceleration at the same time.:7ipwg j12 hl*;zt8cnmqwjw /

  An elevator moving from the second floor to t,n ajw yn6fy;9he fifth floor making no stops along the way has zero ac6a;nn , yjfwy9celeration all the time.

  A rolling ball moves fi 6 mecuev-mhni-l xlkf-(j.;;8v w/vrom $x_1=1.8 \mathrm{~cm}$ to $x_2=-6.2 \mathrm{~cm}$ during the time from $t_1=1.3 \mathrm{~s}$ to $t_2=6.0 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.8 \mathrm{~s}$ is at $x_1=3.3 \mathrm{~cm}$ and at $t_2=4.4 \mathrm{~s}$ is at $x_2=7.5 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complet yre.0iftw,n h,w/dn(e laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 11.7 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 112 m away in 6v/v7uw: jh/x* w *fi sy8fbdv10.1 s. It then turns abruptly and gallops halfway back in 4.7 s. Calculate (f*/ysv wv/*j : i7hdvfw6ubx8a) 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 m-2z . 5b8kx/n)+arccvsdyzaqk d7c1$11 \; m/s$ to $23 \; m/s$ in 4.3 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 from a+/+9nu1oj ak( aijsk$18 \; m/s$ to rest in a distance of 58 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach q*qig de j*o)8t 2vw7ny,)upca 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 ca /mks)bf*bk4/ iswq -bn burst out of the blocks to essentially top speed about m/wbbqkifk b- *s)s4/ $10.4 \; m/s$ in the first 13.4 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 f9 f yi6m-yjs5nzf-,n vrom a speed of $19 \; m/s$ to rest in 5.38 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leave c8c8yvr-d7 x.ndl)yqp0 w3kos skid marks 92 m long on the highway. Assuming any -dyxq0l7dck8.wc 83) op rv deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a tru3.*( zdq jkzl:m ,esyna7cqp.ck 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).    $m$