# A wheel of mass 2 kg having practically all the mass concentrated along the circumference of a circle of radius 20 cm, is rotating on its axis with an angular velocity of 100 rad/s. The rotational kinetic energy of the wheel is Option 1) 4 J Option 2) 70 J  Option 3) 400 J Option 4) 800 J

As we learnt in

Kinetic energy of rotation -

- wherein

= moment of inertia about axis of rotation

= angular velocity

Option 1)

4 J

This solution is incorrect

Option 2)

70 J

This solution is incorrect

Option 3)

400 J

This solution is correct

Option 4)

800 J

This solution is incorrect

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