A person of mass 76 kgkg stands at the center of a rotating merry-go-round platform of radius 3.5 mm and moment of inertia 900 kg⋅m2kg⋅m2 . The platform rotates without friction with angular velocity 0.90 rad/srad/s . The person walks radially to the edge of the platform. Calculate the rotational kinetic energy of the system of platform plus person before and after the person's walk. Express your answers using two significant figures. Enter your answers numerically separated by a comma.

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A person of mass 76 kgkg stands at the center of a rotating merry-go-round platform of radius 3.5 mm and moment of inertia 900 kg⋅m2kg⋅m2 . The platform rotates without friction with angular velocity 0.90 rad/srad/s . The person walks radially to the edge of the platform.

Calculate the rotational kinetic energy of the system of platform plus person before and after the person's walk.
Express your answers using two significant figures. Enter your answers numerically separated by a comma.
 
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