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Old 12-04-2012, 12:12 PM   #9
sureshs
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Join Date: Oct 2005
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Quote:
Originally Posted by julian View Post
The spin axis and ball velocity vector were close to perpendicular regardless of serve type.
Was there a diagram for this? Since there can be two perpendiculars to the velocity vector in 3D, I would like to know which of those two was the spin axis.
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