Question

A 90kg stuntman falls from a
building that is 80 meters tall. (Vo = 0)
Fortunately, the stuntman is attached
to a cable that is wrapped around a flywheel
(massive spool), with a radius of 0.5m. If the man
takes 8 seconds to reach the ground, (a) what is
the moment of inertia of the flywheel? (b) What
is the moment inertia if the radius of the wheel
was 1m? (c) What is the mass of the flywheel in each case?