A fly wheel rotating about a fixed axis has a kinetic energy of `360 J`. When its angular speed is `30 rad s^(-1)`. The moment of inertia of the wheel about the axis of rotation is

Options

A. `0.6 kg m^(2)`
B. `0.8 kg m^(2)`
C. `0.15 kg m^(2)`
D. `0.75 kg m^(2)`

Answer

B

Explanation

`K.E._(1)=(1)/(2)I omega^(2)`