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Old 02-03-2015, 03:52 AM
Chris2828 Chris2828 is offline
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Join Date: Jan 2015
Posts: 178
8 yr Member
Chris2828 Chris2828 is offline
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Join Date: Jan 2015
Posts: 178
8 yr Member
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And here i found the tennis ball calculation:

http://tt.tennis-warehouse.com/showthread.php?t=357202
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