Need physics help with Pulleys with mass

The system shown below is released from rest. The mb = 28 kg block is 2 m above the ledge. The pulley is a uniform disk with a radius of 10 cm and mass m = 4.0 kg. Assume that the string does not slip on the pulley.

(a) Find the speed of the 28 kg block just before it hits the ledge.

____________ m/s

(b) Find the angular speed of the pulley at that time.

____________ rad/s

(c) Find the tensions in the strings.

 ___________N (left)

 ___________N (right)

(d) Find the time it takes for the 28 kg block to reach the ledge.

___________ s