wll end Wednesday or grades Get access.n 133 A remote controlled toy car starts

Question

wll end Wednesday or grades Get access.n 133 A remote controlled toy car starts from rest and begins to accelerate in a straight line. The figure below represents snapshots of the car's position at equal 0.5 s time intervals. (Assume the positive direction is to the right. Indicate the direction with the sign of your answer.) r-0s 1 05s -10s 15s r-20s 16 m 0 Om 01m 04m 09 m (a) what is the car's average velocity in the interval between t . 0.5 s to t 1.0 s? the any prin later m/s (b) Using data from t 0.5s tot 1.5s,what is the car's acceleration at t-1.0 m/s (c) Is the car's speed increasing or decreasing with time? increasing Ins O not enough information The qu velocit that the dea me W eBook Tutorial the equa During a slap shot, a hockey player accelerates the puck from a velocity of 7.00 m/s to 20.0 m/s in the same director. this shot takes 3.33 × 10-2 s, what is the asta ce (in m) over which the puck acoerstes? NOTE The in appro Freight trains can produce onily relatively smal sc F2 F3 FS

Explanation / Answer

7 ans

(a) the average velocity V=0.4-0.1/1-0.5=0.6 m/s

(b) now we find the velocity at t=0.5 sec

initial velocity u=0.1/0.5=0.2 m/s

acceleration a=0.4-0.2/1=0.2 m/s^2

(c) ans

the speed of the car is increases w.r.to time

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initial velocity u=7 m/s

finial velocity v=20 m/s

time t=3.33*10^-2 sec

now we find the distance

distance S=(v+u)t/2=(20+7)*3.33*10^-2/2=0.45 m

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8 ans

(a) final velocity v=4+0.03*8*60=18.4 m/s

(b) time t=4/0.65=6.2 sec

(c) distance S1=4*8*60+1/2*0.03*(8*60)^2=5376 m

distance S2=4*6.2+1/2*0.65*6.2^2=37.3 m

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