Question

Why The work done by the string of a simple pendulum during one complete vibration is zero?

Answer 1

Answer:

Because work done is force × displacement

In this case object came to it's original position

That's why displacement is zero and so the work done

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Explanation:

Answer 2

Explanation:

Work done = force ×displacement

As the pendulum completes one oscillation, therefore it comes to it's original position.

Therefore the displacement is 0

Work = force×0

=> Work =0

Hence work is zero.