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Which of the diagram shown in figures re...

Which of the diagram shown in figures respresents variation of total mechanical energy of a pendulam oscillation in air as function of time?

A

B

C

D

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The correct Answer is:
C
When a pendulum oscillates in air, it loses energy continuously in overcoming resistance due to air, Therefore, total mechanical energy of the pendulum decreases continuously with time. The variation of total mechanical energy `E` with time `t` is shown correctly by curve (c).
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