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The official rules of tennis specify that “The ball shall have a [re]bound of more than 53 in. (134.62 cm) and less than 58 in. (147.32 cm) when dropped 100 in. (254.00 cm) upon a concrete base.

” Understanding the expression “when dropped” as “when dropped from rest,”determine the range of acceptable CORs for the collision of a tennis ball with concrete.

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