A physics textbook weighing 22 N rests on a desk. The coefficient of static friction between the book and the desk is μs = 0.60; the coefficient of kinetic friction is μk = 0.40. You push horizontally on the book with a force that gradually increases from 0 to 15 N, and then slowly decreases to 5.0 N, as indicated in the table below. For each value of the applied force given in the table, give the magnitude of the force of friction and state whether the book is accelerating, decelerating, at rest, or moving with constant speed.

Applied force Friction force Motion 5.0 N 11 N 15 N 11 N 8.0 N 5.0 N