An 7.1-cm-diameter, 320 g solid sphere is released from
rest at the top of a 2.0-m-long, 18\textdegree incline. It rolls, without
slipping, to the bottom.
Part A
What is the sphere's angular velocity at the bottom of the incline?
Express your answer in radians per second.
Part B
What fraction of its kinetic energy is rotational?