$2.$ Shown below is a system in which a cable from C passes around the $20$ kg pulley $\backslash ($ B $\backslash )$ and wrapped around the $40$ kg drum A$.$ Treat the pulley and drum as thin disk for $\backslash (\backslash$mathrm$\{$I$\}\_\{\backslash$mathrm$\{$G$\}\}\backslash ).$ Determine the acceleration of Block C$.($Use Inertia Method$)$

$(1$ pts$.)$

Figure $2$