A circular solid disc of uniform thickness $20 \mathrm{~mm},$ radius $200 \mathrm{~mm}$ and mass $20 \mathrm{~kg}$, is used as a flywheel. If it rotates at $600 \mathrm{rpm},$ the kinetic energy of the flywheel, in Joules is

(A) 395

(B) 790

(C) 1580

(D) 3160

A circular solid disc of uniform thickness $20 \mathrm{~mm},$ radius $200 \mathrm{~mm}$ and mass $20 \mathrm{~kg}$, is used as a flywheel. If it rotates at $600 \mathrm{rpm},$ the kinetic energy of the flywheel, in Joules is

(A) 395

(B) 790

(C) 1580

(D) 3160

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