A person of mass 76 kg stands at the center of a rotating merry-go-round platform of radius 3.0 m and moment of inertia 930 kg·m2. The platform rotates without friction with angular velocity .9 rad/s. The person walks radially to the edge of the platform.
(a) Calculate the angular velocity when the person reaches the edge. rad/s
(b) Calculate the rotational kinetic energy of the system of platform plus person before and after the person's walk. J (before) J (after)