A pendulum of mass $0.5 \;kg$ and length $1\;m$ is released from at an angle $\theta= 60^{\circ}$. What is the power delivered by all force acting on the bob at angle $\theta= 30^{\circ}(g= 10m/s^2)$

Question

$\begin{array}{1 1} 13.4\;watt \\ 20.3 \;watt \\ 6.7\;watt \\ 3.8\;watt \end{array}$