As part of a circus act, a person drives a motorcycle with constant speed v around the ins...

As part of a circus act, a person drives a motorcycle with constant speed v around the inside of a vertical track of radius r, as indicated in Figure. If the combined mass of the motorcycle and rider is m, find the normal force exerted on the motorcycle by the track at the points (a) A, (b) B, and (c) C.

FIGURE