Paragraph-1 : Two discs A and B are mounted coaxially on a vertical axle. The discs have moments of inertia I and 2I respectively about the common axis. Disc A is imparted an initial angular velocity `2omega` using the entire potential energy of a spring compressed by a distance `x_(1)`. Disc B is imparted an angular velocity `omega` by a spring having the same spring constant and compressed by a distance `x_(2)`. Both the discs rotate in the clockwise direction.
When disc B is brought in contact with disc A, they acquire a common angular velocity in time t. The average frictional torque on one disc by the other during this period is :

Options

A. `(2Iomega)/(3t)`
B. `(9I omega)/(3t)`
C. `(2Iomega)/(4t)`
D. `(3Iomega)/(2t)`.

Answer

A