Two discs A and B are mounted co-axially on a vertical axie. The discs have moments of inertia I and 2I , respectively, about the common axis. Disc A is imparted an initial angular velocity 2 omega 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

Two discs A and B are mounted co-axially on a vertical axie. The discs

1.	Two discs A and B are mounted co-axially on a vertical axie. The discs have moments of inertia I and 2I , respectively, about the common axis. Disc A is imparted an initial angular velocity 2 omega 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
Answer» `(2Iomega)/(3T)` `(9Iomega)/(2T)` `(9Iomega)/(4T)` `(3Iomega)/(2t)` ANSWER :A