For a simple pendulum, having time period $T$, the variation of kinetic energy (K.E.) with time $(t)

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For a simple pendulum, having time period $T$, the variation of kinetic energy (K.E.) with time $(t)$ is represented by:

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Sol. [Key Concept: Simple pendulum — KE varies as sin² over time] Kinetic energy, $K = \frac{1}{2}mv^{2}$$$\begin{matrix} & \ = \frac{1}{2}mA^{2}\omega^{2}\cos^{2}(\omega t + \phi) \ & \ 	herefore K \propto \cos^{2}(\omega t + \phi) \end{matrix}$$

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