posted by Chris .
Consider the system shown in the figure with m1 = 25.00 kg, m2 = 10.20 kg, R = 0.18 m, and the mass of the uniform pulley M = 5.00 kg. Object m2 is resting on the floor, and object m1 is 4.00 m above the floor when it is released from rest. The pulley axis is frictionless. The cord is light, does not stretch, and does not slip on the pulley.
a) Find the time interval for m1 to hit the ground
b) Find the time interval if the pulley were massless.
Please help me out. This is the only problem I REALLY DON'T GET!!
The system is an Atwood machine, by the way.