Q$2[$Type B$]$: The $20$ kg pendulum is released from the horizontal position with a speed of $\backslash (0\mathrm{.}5\backslash$mathrm$\{$~m$\}/\backslash$mathrm$\{$s$\}\backslash ).$ Determine the speed of the pendulum when it is $\backslash (60^\{\backslash$circ$\}\backslash )$ below the horizontal direction as shown using work and energy method. Not using the required method will result in a grade of $3$ or lower.