Answer:
A. 0.25
Explanation:
The coefficient of friction can be calculated as follows:
friction coefficient = force of friction / force of weight
The force of friction is equal to the force applied to the book bag, which is 5 pounds, and the force of weight is equal to the weight of the book bag, which is 20 pounds.
friction coefficient = 5 / 20
friction coefficient = 1/4 or 0.25
So the coefficient of friction between the floor and the book bag is 0.25.