Determine the magnitude of the normal force and the rolling frictional force that the track

exerts on the motorcycle at the instant theta = 5pi/3 radians. The bike is moving at constant speed

of v = 20 m/s, and the combined mass of the motorcycle and driver is 300 kg. The track along

that portion has the functional form r(theta) = A*theta^3 where A = 5 m.