If Andy Roddick can hit serves at 150mph+, how fast does the head of the racket have to be travelling to give the ball that much velocity. Given that the ball has no horizontal momentum at the instant it is hit by the racket, at what speed must the racket head be travelling to send the ball away at over 150mph?
Liking Guy Tennis Coach?
It would have to travel at least half as fast as the velocity of the ball. I would estimate it is traveling faster though; probably in the neighborhood of 90 mph.
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