Two pulses of exactly the same size and shape are traveling toward each other al

Question

Two pulses of exactly the same size and shape are traveling toward each other along a stretched rope. They differ only in that one is upright while the other is inverted. Superposition tells us that when the pulses meet each other, they will cancel each other exactly at that instant and the rope will show no evidence of a pulse. What happens afterwards ?

A. Each pulse continues as though it had never met the other one.

B. The rope remains straight, since the pulses have cancelled each other.

C. The pulses rebound from each other, each going back in the direction from which it came.

D. None of those.

Explanation / Answer

A. Each pulse continues as though it had never met the other one.

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