Question: A circular solid disc of uniform thickness 2 0 mm , radius 2 0 0 mm and mass 2 0 kg , is used as

A circular solid disc of uniform thickness 20 mm, radius 200 mm and mass 20 kg, is used as a flywheel. If it rotates at 600 rpm, find kinetic energy of the flywheel, in Joules.
(a)640
(b)210
(c)395
(d)790

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