A girl of m = 50 kg is sitting on the edge of the merry-go-round (suppose a solid disk) at the play ground, the merry-go-round of m mgr = 250 kg, r mgr = 1.5 meters is rotating having an angular velocity of 15 radians/sec, the girl gets up and walks tp the very center of the merry-go-round, determine the latest angular velocity of the merry-go-round having the girl in the center?