Chapter 9, Problem 48P

* A boy of mass m is standing on the edge of a merry-go-round platform, which is initially rotating with a constant rotational velocity ${\omega }_{\text{i}}$

(initial state). The rotational inertia of the merry-go-round is l, and the rad us o' the platform is r. After me boy steps down from the platform, tangentially to its edge, the merry-go-round continues rotating with a smaller rotational velocity ${\omega }_{\text{f}}\text{,}$ and the boy continues moving away from the platform with constant speed v (final state). (a) Draw three rotational momentum bar charts, choosing the boy, the merry-go-round and both of them as a system. (b) Derive me expression for ${\omega }_{\text{f}}$ in terms of me relevant quantities.