college physics

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an atwood machine is constructed by mounting a well-lubricated pulley (not necessarily a ring/disc), whose radius is 6.00cm on an axle and passing a rope over the pulley. Each end of the rope is attached to a different mass of 3.0 kg and 2.0kg so they both hang vertically. when released from rest, a motion detector measures the descending mass's acceleration as 0.70m/s^2. The mass of the pulley is 4.00kg.
a.) Find the rotational inertia of the pulley.
b) find the kinetic energy of the ENTIRE system when the mass has fallen 3.5 m.

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