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A circular platform is mounted on a vert...

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

`1.2 rad//s`

B

`0.4 rad//s`

C

`2.0 rad//s`

D

`0.7 rad//s`

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The correct Answer is:
D
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