Each of the double pulleys shown has a mass moment of inertia of 20 kg · m2 and is initial...

Each of the double pulleys shown has a mass moment of inertia of 20 kg · m2 and is initially at rest. The outside radius is 400 mm, and the inner radius is 200 mm. Determine (a) the angular acceleration of each pulley, (b) the angular velocity of each pulley after point A on the cord has moved 3 m.