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Old 08-23-2012, 09:52 AM   #46
Bionic Poster
Join Date: Oct 2005
Posts: 34,111

Do a simple experiment. Hang a racket with a thin string and also hang a ball in front of it. Take the racket back like a pendulum to the same distance that Fed takes back his racket, and let go, and position the ball so that it gets hit.

See if the ball leaves at 80 mph.
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