Ft = change mv = mvf-mvi
Be careful with your signs. If you call the initial serve positive the return must be in the negative direction.
a tennis ball has mass 0.045 kg and is hit at a speed of 120 km/h by the server. the opposing player hits the ball exactly back along the line of its trajectory giving the ball a new speed of 115 km/h. if the contact time between the racquet and the ball is 0.02s what is the average force on the tennis ball imparted by the opposing player?
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