A circular platform is mounted on a vertical frictionless axle. Its radius is `r = 2 m` and its moment of inertia`I = 200 kg m^2`. It is initially at rest. A `70 kg` man stands on the edge of the platform and begins to walk along the edge at speed `v_0 = 1 m s^-1` relative to the ground. The angular velocity of the platform is.

A circular platform is mounted on a frictionless vertical axle. Its radius R = 2m and its moment of inertia about the axle is 200 kg m^(2) . It is initially at rest. A 50 kg man stands on the edge at the platform and begins to walk along the edge at the speed of 1ms^(-1) relative to the ground. Time taken by the man to complete one revolution is :

A circular platform is mounted on a frictionless vertical axle. Its radius R = 2m and its moment of inertia about the axle is 200 kg m^(2) . It is initially at rest. A 50 kg man stands on the edge at the platform and begins to walk along the edge at the speed of 1ms^(-1) relative to the ground. Time taken by the man to complete one revolution is :