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
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: As the system is initially at rest, therefore initial angular momentum, 
.
According to the law of conservation of angular momentum final angular momentum, 
angular momentum ofj man = angular momentum of platform in opposite direction
i.e., 
or, 
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