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Tennis ace on ball ball problems

Suzumiya Mei Xiang2010-02-15 14:10:35 +0000 #1
terms ace ball ball when using a photograph from the net with the ball touch the time and distance and shoot the ball touch the ball landing time and distance, or anything else?
richccsy2010-02-15 14:19:00 +0000 #2
tennis ball calculated using a Doppler radar device (the specific principles can go BAIDU look for), and the police speed measuring equipment used is similar. Do not use "distance / time" to be calculated.
Cai Health2010-02-15 14:35:26 +0000 #3
calculated from making contact with the ground surface to the distance between the speed.
Yvic782010-02-15 15:07:05 +0000 #4
the latter touched the net with a network that would be re-hair brush



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