Correction for the weight of a Tennis Ball
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How heavy is 0.031 slugs?
It's about eight times as heavy as a Tennis Ball
The weight of a Tennis Ball is about 0.00395 slugs.
(ITF Standard; for Type 2 ball)
Per International Tennis Federation standard, regulation tennis balls must weigh about 0.00395 slugs. Competition balls are also tested for bounce height, with the standards requiring that a ball dropped from 254 cm must bounce back to a height of 135 cm to 147 cm.