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Is 491 miligrams as heavy as a Tennis Ball?

It's about one-one-hundredth as heavy as a Tennis Ball
The weight of a Tennis Ball is about 57,700 miligrams.
(ITF Standard; for Type 2 ball)
Per International Tennis Federation standard, regulation tennis balls must weigh about 57,700 miligrams. 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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