Suppose that an object travels from one point in space to ) bgg8vrt -tqlevbeq)/l +*;oanother. Make a comparison between the displa)et v r)og; 8bt-l*g/+vbqe lqcement and the distance traveled.

  When is the average velocity of an object equal to the instan/pf au-whvg9f:.m fi-s6 in 7ktaneous velocity?

  A new car manufacturer advertises that their car can go "(bxkzpn7xm52 : 4 )sr aglp/lbfrom zero to sixty in 8 s". This n:zbpp)g/x lsabx2 mr5(l4k7is a description of

  An object moving in the +x axirtd9r;, -ytsrc:-a.hdf uwk+ s experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling t/fncqy+n x s.e ;9 v5ogc*f5auo the East (+x direction) begins to slow down as it approaches a traff.+gu v 9c /esaxo5;cqnn fyf5*ic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slo 2e. u2e kn8s,toli r,zf+o*a iir33tnw down as it approaches a traffic light. Make a statement concernuaso,kef n o.renttl3izi 8 3r2,i 2+*ing its acceleration.

  Suppose that an object is moving*yy:0fd -ghtb with a constant velocity. Make a statement concerning its accelerati:-0yy bdth* fgon.

  If the velocity of an object is zero, f:gmwnstd*se+ k/ ss,:1 d e2sdoes it mean that the acceleration is zero? Support your d s:tkwg:f, ness+d21* es/msanswer with an example.

  Can an object's velocity crkp, dm.p 5zb3hange direction when its acceleration is constant? Support your answer zp,mpd5b3 k.rwith an example.

  Suppose that an object is moving with constant acceleratm)vu f9f6harz1ks4p *ion. Make a statement concerning its motion with respect to t1hpu*frma6s v z)k49fime.

  Can an object have increasing speibi; 0qf(lw4 zed while its acceleration is decreasing? Support 0iibl fz4;(w qyour answer with an example.

  Suppose a can, after an initial kick, moves up along a smooth hill ofh- w * 8sk3maxblq5) ebehcf+0 ice. Make a statement conce-bs )hlxk 83 eqac+*0mwh5efbrning its acceleration.

  Under what condition is average velocity equal to the avv*l6jd+5lk ynw26 f3o r6yc saerage of the object's initial and final vekco s v32a 6jd6yr5nwylf6+* llocity?

  Objects A and B both start at rest. They both accelo jwhj- n9hik0:tvk10 ghl) y.erate at the same rate. However, object A accelerates for twic-h0o1 k :)v0hjk jn h9gwl.tyie 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 ajqf;4b o c3m5kccelerate at the same rate. However, object A accelerates for twice the time as object B. What is the d;m cko 45b3fqjistance traveled by object A compared to that of object B?

  When an object is released from rest and falls in the absence of friction,(+z :ln2: dtzcjzdb(8m qxejxhr 0 e5, which of the follond(8 j5zd2cetjr :xlbh0+mzx ,z: qe( wing is true concerning its motion?

  When an object is rel,+xo p* 9sz.e (nsigrieased from rest and falls in the absence of friction, which of the following is true c, is*(o+ezgxn sp9r .ioncerning its motion?

  Suppose a ball is thrown straight un+ ijdca9i9)jhf )4x wp. Make a statement about the velocity and the a)iac)x nji4dj 9w9hf+cceleration when the ball reaches the highest point.

  Suppose a ball is thro ) kf:5pusv7wown straight up. What is its acceleration just before it reaches its highest p puf7:voks )w5oint?

  Suppose a ball is thrown straight up, reaches r9u 6bky-z v nrw4/.r e 7wjm5cqj2cw4a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the balw.un wzer2vb7km45c64j rr9q w-y c/jl is going up.

  A ball is thrown straight up, reaches a maxiz tpe0+ a:xky 4 zhi80rd (s3.zqwjl,s)iwz)pmum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is x3d wa)z+w.:zr t4 pk0iz 8q,z0jy hs lis)e(pcoming down.

  Suppose a ball is thrown downwarcskt/ vnoq 6 - tko.t-.ifhz(2d in the absence of air resistance. Make a statement concerning its accelerk nct-zsoq2k/-.f.tt 6(oh vi ation.

  Suppose a skydiver jumps from a high-fpk:) eg *;*d .sb0,oei idkmjjqat*n*lying plane. What is her acceleration when she she reaches terminal*ipqamsd;kke*j n * *,:gtiej0d.bo ) velocity?

  A ball is thrown vertically upward with a speed v. An id,b 0yz65 hb(pvdi +bigs:+hp zs*hz3ientical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the second balis szvi*6h bb0hzzdgb(ih+ p53,+p:yl 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 build dw;,ax5qoh (king. One second later, ball B is dropped from the same building. As time progresses, dw;xka5 oq,h(the distance between them

  Ball A is dropped from the top of a building. 7/l9flmqv)lva)e: g jrx(,poOne second later, ball B is dropped from the same building. As time progressesjxv(,ofeprl)l7g /qv a: )lm9, the difference in their speeds

  Two objects are thrown from the top of a tall bui. wtj(f(otjf 9 2mvo.llding. One is thrown up, and the (tfwlm .jo(v2. 9tof jother 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 bri fl eq,6-iqwy)ck is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Com6qwqe,l )iyf- pare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. The posi7 o f:xygf*,pyx kv,e8v3 r,o.u8 bzmotion versus time graph of this ooezyy. :fxo kfg uvovr8,7b ,m3 ,px8*bject is

  An object is moving with constant non-zero acceleration in the +x a m a9rv/bt //b)jq.qklxis. The posi/./r)9v lmqaqb btj/ktion versus time graph of this object is

  An object is moving with constant non-zero velocity in the +x axis. The velocek h ):ee+ +mhk* k)*bt apmfmc*/cd5*) zpquiitycfm)h:e +cbkkptiz k *e+h5d) pm *e*)*a /qmu versus time graph of this object is

  An object is moving wi /j(1i348c*l oxsmp rsjiko / 9sauhx1th constant non-zero acceleration in the +x axis. The velocit(s9s3ajoxhil i1* cxum/r pos 84j1 /ky versus time graph of this object is

  The slope of a position vers 7gk :zou3j)k y7u39rqub.pul us time graph gives

  The slope of a velocity ul8h)d /cnycang*nc q. 2l8* jversus time graph gives

  The area under a curve in an acceleration versus time graphd dmjt6x25c2; vq sy7e gives

  The area under a curve in a velocity 6ds5 nx7zmcss 8 *tgx4h1jab(m6gq o.versus time graph gives

  If the position versus time gr tm/ zb.,qs(i:hzjs;gaph of an object is a horizontal line, the object i,qh / ;m(zijs :stgb.zs

  If the position versus time graph of an object is a vertical line, the j (64h.q7p6gmsujisfobject isi4 jfusq(j. 6sm7pgh6

  If the velocity versus towhj7oa4-b 3q7tsp c (4 d(y9dtct6hoime graph of an object is a horizontal line, the object ipc oq4ot7(b9t463 (dohah- yt swcdj7 s

  If the velocity versus time graph ofc4ytye p; 8aw:co1b7:of 9ksm :vw+er an object is a straight line making an angle o 9b8frvct eek1+4y: o ;a7ww:spc:ymof 30 degrees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the dista u/v;i6n89yxtn9nmu k:ewqx c :vy4x9nce traveled and the magnitude of the 4xnwmk9ny; /9y6uqe t i9:x8v: xvncudisplacement vector.

  A boat can move at 30 km/h in still water. How long will it take to move 12-hk tbwxbp 3a- 9*sz(ft nmq.: km upstream k .npz- mt9t:qwx(fabs3 *h b-in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609 hhozpah:wi(0upqs 6ane2ssd*9pb( , r,-5vi m)

  What must be your average speed xau(//yrl li 97lhdk.in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours ar64blj/i.ps w np3cu :nd 57 min. What is thpipbw.jus:4n r /l3c6 e average speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to travelu1 (x2khyppg*tlc-;35ukzh e 400 km?

  A ly (light year) is the distance that light travels in one year. Thpkuga, .b rimm8 - 7arey-hl:-e speed of light isi8huk,pler-:m yarmg-.ba 7- $3.00 \times 10^8 \; m/s$. 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 l;n:ukg6 z0 h ye5eha:uook to the side for 4.0 s, how far do you travel dur:z;65yknh gh0ueu: ae ing this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, you)tk/jt oww--z7tk;4laq e)8vkis c.n3gc 7 h or average )778jatte3kswz cc-to-4nqw k o/. h)ik;lvgvelocity is

  A polar bear starts at the North Pole. It travels 1.0 km south, then a6cz+.tfyun 4h:e*x p 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 fy6z aex+c: 4n.th* pubear's average speed?

  A polar bear starts at the North Pole. It travels 1.-psr/s y1:2-)iu ul-f:exvct 4 dihfd 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 tht:ei24/virx 1cy )- -ful-:h fspsdud e bear's average velocity?

  You are driving home md:80p9epy ov on a weekend 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 minu 09pvoe :8pymdtes. 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 the ave0m6rubh/ hx - 0v.iuqfzw6x2frage speed of the motor2zuv q wxf.- 6hubm r6x0/0fhiist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. 4;qhi qdoo8i9What is her average speed for the to; 8qoi qhdi94rip?

  An airplane travels at 300 m ul g b4v0 elshqw2+tp,(g.pa-i/h south for 2.00 h and then at 250 mi/h north for 750 miles. What is the av+l(w,u2lqgp-.et sph 0a 4bgverage speed for the trip?

  In a 400-m relay race the anchorman (t. u8p yvsct h )helh: )ldd1i1pvskv0u)g,/9 nhe person who runs the last 100 m) for team A can run 100 m in 9g1h,tinlvle.8)d9dhvcsp y k)/u)s u0: 1vp h.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 uniformly hu0+/a7+vqq h vsq8f eand comes to a stop after 8 s. The car's average velocity during decel8q us+ave/7hvfqq h +0eration was 36 km/h. What was the car's deceleration while slowing down?

  An airplane increases itsyj )leovqfgfjc82bqp02 6( 75i;,) tjyyiwvx speed from 100 m/s to 160 m/s, at the average rate of 6ilq)o xiwq 5btvc07vgp 2fj),jf ye;y 8y2j( $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at thewju55bch ff 8gl87r m3 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 anw s p-g5h4kr*2ecedh qd-j-6rd 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 ji,n8h6 6 ro bj1ikl:xspeeds up with a constant acceleration of k8ij rin6hxb 1lo6:j,$2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 1.2 m/s experiences a cgw 9u3q:1nrc ulm12 tconstant acceleration ofn1lcmu:wrtgq321 9 c u $1.7 \; m/s^2$. What is the cart's displacement during the first 8.1 s of its motion?

  A bullet moving horizontally to the rik) qtyy*1cr-rriqw93 ght (+x direction) with a speed of 520 m/s strikes a sandbag and penetrat 3 w9 y1kr)rqrc*t-yiqes a distance of 39.16 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is lhwc+ 3uk0d c;paunched from a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapkc+w ch0 u3p;dult, and this requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with constant acc z4 jb+de3c px1z*+n.qkzo*ureleration 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 i 9uhwk*,r kzv6n a distance of 200 m. What is its average accelerativ6w9k, hk* urzon?

  An object starts froz*m(* cg (olw2pyz4x nm rest and undergoes uniform acceleration. During the first second it travels 2.9 m. How far will it travel during*wxmg (czz4 y(o*2 lpn the third second?

  An object is moving in a straight line with constant accelera*, hy2zh33rsut q+goption. Initially it is traveling at 16 m/s. Three seconds later it is travelinh* pzoh2q+y ur s,t33gg at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates uniformly atrar ww 8q5cw:) $3.0 \; m/s^2$. 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 dryx7s ijb:a3jn ( 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, a car jlkgaj r fu4, qp y)13hr2alhp+33s-qthat has been waiting at the intersection starts ahead wayhqgsh a) 13u j rpr3-k2lq jpf+4,3lith 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 upward with a speed of 12 m/s on thex2v 6gr;4hr4ai0j e un surface of planet X where the accelerationrru n6xja42g;hi4 ev0 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 0phl7 gqbv* :mo 9mk9xp ud,a*of 12 m/s on the surface of planet X where the accelqk0h9m o:vup7*x 9gdb,l ma* peration 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,r smpkk re*;3 m/s on the surface of planet X where the acceler3 kpm; rk*,seration 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 c uyn/0d i92vosnc; e,aid .v6on the surface of planet X where the acceleration due na o/s2dun.;y 06ed,c9iicvv 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 holds 3yv 1(em7q38dtp 9t(rfd7yt fnnol7ka ruler betwytl (fpqo3kmn 7e d9(t7 f18tnrdyv 37een your fingers and releases 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 velocitl0)97fyg qc j9q+gplr y after 3.00 sgy f79j cglpr0 )9q+lq?

  A bullet shot straight up returns to its starting point in 13 s. What is the8gvkigr6z +rj-g 9sp ( initial speed of the bulle( rgv68g+irk jp9g-szt?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it take zycc;wmx7*1dto ;ywc z7d*mc1x return to its starting point?

  A ball is thrown downward from the top of a building y/bvcr5xi(fh(7k0 fq with an initial speed of 23 m/s. It str7(5rqf0c/kvi y (fh xbikes the ground after 3.0 s. How high is the building?

  A ball is thrown straight up with a spota8p t+ z5vn* lamjm12b5nr/ eed of 30 m/s. (only fill in numerical value in the j5ra*1 t/vbtzmmpnalo852n + 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 s il .wu-hhr)ki 8i 5nn.7xyg(ctob:4gpeed of 37.6 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 14 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 14.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocijl 3kcp;u)cd3 8c1wu dty at t = 1.0 s?

  In Fig. below, what i6a i5l0db8 ugkhxd51js the velocity at t = 2.5 s?

  In Fig. below, what is the velocity at t = 4.0 b*+ /zv5ubx 2 b x+sbubp7mv2bs?

  In Fig. below, what is the velocity at t = 5.5++vs,5j.swqbl3m t ho0vqseuprg 4*9 s?

  In Fig. below, what is the a0r 5vaoypwhamco94 bd60, mtox q96x3verage velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity f vz2hnyd k0fkqq r)3pgk) q58+rom 0 to 6.0 s?

  In Fig. below, what is the acc+ p9kwkx6jeb2-o pagk:5gi*kq.kbnf ;sb92 yeleration at 1.0 s?

  In Fig. below, what is the acceleration yqq7wsjyenzw2;zs 8:(53 byeaspy 4kxj .1g3at 3.0 s?

  In Fig. below, what is the avev4v e2f.s fmgg75+tfirage acceleration from 0 to 5.0 s?

  In Fig. below, what is the a 7+ e9vc1phhu jry9onl*b0)haverage acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 to dsi3kow* f f/v(yfl*1gtne c/p2zfl; h;lt 988.0 s?

Does a car speedometer measure speed, v+c eb 1pyuidf ,pnv;*5elocity? {speed|velocity}

  An object can have a varying speed if its z9b5nuzl; .ms(.wcveuzl2y302j td s velocity is constant.

  The velocity of an object can be negative when its acceleration is positi9.-xur f(fs tfly: 6tive.

  If one object has a greater speed than a second object, the x3)o3kv gf :xwfirst must have a greate)fvx k w:gx33or acceleration.

  Two cars emerge side by side from a tunnel. Car A 6v bnf o r1 +hx9tizkq1ab4q9f/ln d28is 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 increrho(,:xn/wh m asing in speed as its acceleration decreases.

  A baseball player hits a foul ball scu2gu 8 1p/:/zmuc up/avs 6uptraight up into the air. It leaves the bat with a spz/spuu21 pvcm u/puc6u8 g/a:eed 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 acceleration, ht*vh,zozfwp46ww/ 8cnnapcr7 (0mb 9 ow do6w f(p90cm,8bhzpw cnnzot */aw v74res it change if air friction is ignored?

  As a freely falling opcib o+;y++ ozpsp13 gbject speeds up, what is happening to its acceleration, how does it change if air s1o+yb ;zoc+3pi gpp+friction CAN NOT be ignored?

  An object that is throw2z9kw y/ qtwbvsz.z2iw-:as w-fs +- zn vertically upward will return to its original position with the same zkt:szaqv sw/9wwzw .s2+ i b-yfz2--speed as 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 andgbz r99gpxol4p */bpgk a6d(+ jta0 0d nonzero acceleration at the same time.

  An object can have nonzero velocity and zero accelen dv ctq.4z4zi5oc55 sk9 poq,ration at the same time.

  An elevator moving from the second floor to the qg 2bwr/+gmfw-i(p z5 fifth floor making no stops along the way has zero accel2wg -gmirp+ (5w/bzfq eration all the time.

  A rolling ball moves p/4ckbllsgzzif a5a i1f24f m/(h6-q from $x_1=3.2 \mathrm{~cm}$ to $x_2=-6.1 \mathrm{~cm}$ during the time from $t_1=2.9 \mathrm{~s}$ to $t_2=5.4 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.2 \mathrm{~s}$ is at $x_1=2.2 \mathrm{~cm}$ and at $t_2=4.5 \mathrm{~s}$ is at $x_2=8.2 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps aroun mj+;lh.osgs vtz:n* 3d a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 6.4 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 straig8ikc-na4 x- pwht line, moving 115 m away in 8.3 s. It then turns abruptly and gallo cwp8ax k--in4ps 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 from5skm;gi8 w 9: be7elx0d yha0r $11 \; m/s$ to $25 \; m/s$ in 5.8 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 fro3w7fd/5vw5t i+ d ijrbnh dk7yu11 8bnm $19 \; m/s$ to rest in a distance of 56 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach ace.z .dnwsr6rvg: 5i) -q. ypu speed of $26 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.5 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essc:uj9s gj6xyek*+ ga,entially top speed aboutua9xej c *gsg:6y+,jk $10.1 \; m/s$ in the first 14.3 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 uniformlol(jeag8ieswhg ,pj;qu6lb3l (j0 69)cv c.ty from a speed of $20 \; m/s$ to rest in 4.50 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. Assu)4fd1,us tacjming a,uac14s jdft) deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$