a playground merry go round has a radius of 4.40 m and a moment of inertia of 245kg.m^2 and turns with negligible friction about a vertical axle through is center.
(a) A child applies a 25.0N force tangentially to the edge of the merry go round for 20.0s. If the merry go round is initially at res, what is its angular velocity after this 20.0 s interval?
(b) How much work did the child do on the merry go round?
(c) What is the average power supplied by the child? Please be so kind to show the steps.