Joe hangs a rope of length L = 100 m and mass m = 5 kg from a high beam. He adopts a coordinate system in which the height, y, is measured from the bottom of the rope. So y = 0 at the bottom and y = L at the top.
Joe gets in a crane, rides up to the middle of the rope (y = 50 m), and whacks the rope with a stick. He watches as waves run away from the middle: one runs up to the top, the other runs down to the bottom. Which wave reaches the end of the rope first?
A. Wave going up reaches top first B. Wave going down reaches bottom first C. Both waves reach the ends at the same time
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