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49. A flywheel of moment of inertia

A flywheel of moment of inertia 0.32 kg–m2 is rotated steadily 120 rad/s at by a 50 w electric motor. The kinetic energy of the flywheel is

(a)   4608 J

(b)    1152 J

(c)     2304J

(d)   6912J

Ans. c

(109)

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