A runner starts from rest and in 2 s reaches a speed of 10 m/s. If we assume tha

Question

A runner starts from rest and in 2 s reaches a speed of 10 m/s. If we assume that the speed changed at a constant rate (constant net force), what was the average speed during this 2 s interval? average speed = m/s How far did the runner go in this 2 s interval? distance = m The driver of a car traveling at a speed of 18 m/s slams on the brakes and comes to a stop in 4 s. If we assume that the speed changed at a constant rate (constant net force), what was the average speed during this 4 s interval? average speed = m/s How far did the car go in this 4 s interval? distance = m

Explanation / Answer

a) vi+ vf/2 = 10/2 = 5 b)d = (vi+vf)/2 t = 10/2*2 = 10 m c) (vi + vf)/2 = 18/2 = 9 m/s d) d = (vi+vf)/2 t = 18/2*4 = 36 m

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