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70 kilograms is about 1,000 times as heavy as a Tennis Ball.
In other words, it's 1,210 times the weight of a Tennis Ball, and the weight of a Tennis Ball is 0.000826 times that amount.
(ITF Standard; for Type 2 ball)
Per International Tennis Federation standard, regulation tennis balls must weigh about 0.0577 kilograms. 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.
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