A block of mass m= kg is hanging from a rope attached to a pulley.
The pulley has a mass M= kg and a radius of R= m.
The block is held fixed, then suddenly released.
What is the angular acceleration of the pulley?
How long after being released will the block be falling at a speed of v= m/s?
(The moment of inertia of the pulley is I=1/2 MR2.)