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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 m2. It is initially at rest. A 50 kg man stands on the edge of the platform and begins to walk along the edge at the speed of 1 ms–1 relative to the ground. Time taken by the man to complete one revolution with respect to disc is :–

(a) πs

(b) 3πS/2

(c) 2πs

(d) πs/2

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Correct option (c) 2πs


 Using angular momentum conservation,

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