Two discs of same moment of inertia rotating their regular axis passing through centre and perpendicular to the plane of disc with angular velocities `omega_(1)` and `omega_(2)`. They are brought into contact face to the face coinciding the axis of rotation. The expression for loss of enregy during this process is :

Options

A. `1/4 I (omega_1 - omega _2)^2`
B. `I(omega_1 - omega_2)^2`
C. `1/8 (omega_1 - omega_2)^2`
D. `1/2 I(omega_1 + omega)^2`

Answer

A