Q 31. A flywheel connected to a punching machine has to supply energy of 400 Nm
while running at a mean angular speed of 20 rad/s. If the total fluctuation of
speed is not to exceed 
the mass moment of inertia of the flywheel in kg
is
(A) 25
(B) 50
(C) 100
(D) 125
Answer: (A )
Explanation:
