For a top player, a tennis ball may leave the racket on the serve with a speed …

For a top player, a tennis ball may leave the racket on the serve with a speed of 55 m/s (about 120 miles/h). If the ball has a mass of 0.060 kg and is in contact with the racket for about 4 ms (4×103 s)(4\times 10^{-3}~\rm s), estimate the average force on the ball.
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