* 13-76. Prove that if the block is released from rest at
Chapter 13, Problem 13-76(choose chapter or problem)
Prove that if the block is released from rest at point B of a smooth path of arbitrary shape, the speed it attains when it reaches point A is equal to the speed it attains when it falls freely through a distance h; i.e., \(v=\sqrt{2 g h}\).
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