A man is driving 25.0 miles hour on 1-10 when he sees a police car. He speeds up

Question

A man is driving 25.0 miles hour on 1-10 when he sees a police car. He speeds up to 30.0 m/s. It takes him 165·ft to do this. 4 Put all units into SI (metrice) VF = 30.0 m/ %-25.0 mileshour (a) What is 25.0 miles/hour in m/s? (b) What is the car acceleration in m/s? (e) How long does it take the car to speed up to 30.0 m/s? Ax-165ft A ball is tossed up in the air at 5.00 m/s on Earth (disregard air resistance) ow long is the ball in the air? at is its velocity went it returns to its original position? w high did the ball go? Vo= 5.00 m/s

Explanation / Answer

1 mile = 1609.34 m

1mile /hr = 1609.34/3600 m/s

25mile/hr = 25*1609.34/3600 m/s = 11.17 m/s

V2 = U2 + 2aS

putting values here we get

(30)^2 = (11.17)^2 +2a50.2

=> a = 7.72 m/s2

for t we will use

V= u + at

30 = 11.17 + 7.72t

=> t = 2.43 sec

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