Rationale

Consider a system of two masses, m and M, connected by a light string to a light pulley of negligible friction. If M > m, then the system will accelerate in the direction of the net force acting on it.
1)  What is the net force acting (a) on the system m and (b) on the system M? Express your answer for acceleration algebraically in terms of g, m, and M only. 
the heavy mass will start from rest at a height h. Once released, it will accelerate towards the ground and hit it at time t.
2)  What is the acceleration of M systems?  Express your answer for acceleration algebraically in terms of h, and t only.