Probably Masses, Planes, Pulleys IV (no figure)

In the figure above, $M_1$ and $M_2$ are masses, and the pulley (a disk) has mass $M$ and radius $r$. The plane is at an angle $\theta$ and has a coefficient of kinetic friction $\mu_k$. Use $g$ for the gravitational force.

a) Draw a force (free body) diagram for each mass. Don't forget the massive pulley.

b) Write Newton's second law, in the appropriate form, for each mass.

c) Solve for the acceleration of the system, assuming that it is moving initially to the right (so that static friction is irrelevant). Show all work.