Impulse = change in momentum force * time {J= m(v-vo); J= Ft = m(v-vo)} 1. A 1500 kg car accelerates from 13 m/s to 18 m/s. Find the change in momentum of the car. 2. A 0.07 kg tennis ball, initially at rest, leaves a racket with a speed of 56 m/s. If the ball is in contact with the racket for 0.04 s, what is the average force on the ball by the racket? 3. A 0.145 kg baseball reaches a speed of 36 m/s from rest when a bat strikes. If the average force of 500 N was applied on the ball by the bat, what is the impact time?

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