Answer
See work.
Work Step by Step
As discussed on page 151, the centrifugal force is a fictitious force that only an observer in an accelerating reference frame feels.
As an analogy, imagine a person sitting in a car that is accelerating forward. The free-body diagram for the person would show a forward-pointing normal force from the seatback, but would not include any backward-pointing force, though the person “feels” such a force.
