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.
(b) Find the angular speed of the pulley at that time.
(c) Find the tensions in the strings.
(d) Find the time it takes for the 28 kg block to reach the ledge.