What type(s) of energy is/are contained in a roller coaster car after it has come to a complete stop at the station? A. kinetic energy only B. potential energy only C. both kinetic and potential energy D. neither kinetic energy nor potential energy

Aplayground merry-go-round has a radius of 4.6 m and a moment of inertia of 200 kg-m2 and turns with negligible friction about a vertical axle through its center. a child applies a 26.0 n force tangentially to the edge of the merry-go-round for 15.0 seconds. if the merry-go-round is initially at rest, how much work did the child do on the merry-go-round?