A merry-go-round on a playground has a total mass of 250 kg and radius of 1.20 m, and is rotating at w = 4.50 rad/s. Assume that the merry-go-round can be approximated as a disc spinning around its center axis. Its angular momentum is _______ kg\"m2/s. (3 pts. for calculations} 810 Two children, of masses 20.0 kg and 25.0 kg, jump onto the edge of the merry-go-round. It's new angular velocity is _______ rad/s. {3 pts. for calculations.)