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In the experiment to plot the graph between square of amplitude and time of a simple pendulum and dissipation of energy , the oscillation occur in viscous medium like air. the energy versus time graph looks like

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In viscons medium like air, the oscillations are damped and part of energy is disipated in overcoming resistive forces.
Consequently the amplitude goes on decreasing and so the energy also gets reduced.
Hence c is the correct answer.
answered Mar 18, 2014 by meena.p
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