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A man of mass m=80kg runs at speed u=4m/s along the tangent to a disk-shaped platform...

A man of mass m=80kg runs at speed u=4m/s along the tangent to a disk-shaped platform of mass M=160kg and radius R=2m. The platform is initially at rest but can rotate freely about the axis through its center. Find the new angular velocity after the man steps on the platform (treat the man as a particle).

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