Answer
a. Same.
b. The force is the normal force, and it is the centripetal force that keeps the motorcycle moving in a circle.
Work Step by Step
a. In the vertical direction, the only forces are friction, and the weight of the motorcycle and rider. Since there is no change of velocity in the vertical direction, these forces must be equal and opposite.
b. The horizontal vector represents the normal force of the wall pushing inward on the motorcycle's tires. This normal force is the required centripetal force needed to keep the motorcycle moving in a circle.
