Correction for the weight of a Tennis Ball
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How heavy is 0.000000000396893323750 megatonnes?
It's about seven times as heavy as a Tennis Ball
The weight of a Tennis Ball is about 0.00000000005770 megatonnes.
(ITF Standard; for Type 2 ball)
Per International Tennis Federation standard, regulation tennis balls must weigh about 0.00000000005770 megatonnes. 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.