A woman of mass m stands at the edge of a solid cylindrical platform of mass M and radius R. At t = 0, the platform is rotating with negligible friction at angular velocity w0 about a vertical axis through its center, and the woman begins walking with speed v (relative to the platform) toward the center of the platform. What will be the angular velocity when the woman reaches the center? Express your answer in terms of the variables m, M, and w0.