A circular platform is mounted on a frictionless vertical axle. Its radius is 2 m and its moment of inertia about the axle is 
. 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 
relative to the ground. Time taken (in sec) by the man to complete one revolution is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
From conservation angular momentum,
Or 
Linear velocity of a point on the rim of the platform, 
Time taken, 
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