$($II$)$ Two blocks, one with mass $M$ and the other $2M,$ lie on separate frictional inclined planes, one at $16\mathrm{.}260$ and the other at $73\mathrm{.}740.$ The coefficient of kinetic friction acting between the block on the left is ${}_{k,1}=\frac{1}{8}$ and that on the right is ${}_{k,r}=\frac{4}{7}.$ The blocks are joined by ideal rope which passes over an ideal pulley. The system is in motion, with the block on the left moving upward along its incline while the one on the right is moving

$($a$)$ Draw FBDs for each of the blocks.

$($b$)$ Determine the acceleration of the system of blocks.