93. A 1.0-kg trash-can lid is suspended against gravity by
Chapter 13, Problem 93(choose chapter or problem)
93. A 1.0-kg trash-can lid is suspended against gravity by tennis balls thrown vertically upward at it. Howr many tennis balls per second must rebound from the lid elastically. assuming they have a mass of 0.060 kg and are thrown at 12 m/s?
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