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## Homework Statement

A book has a mass of 400 g. When you slided the book against the floor with 5 N, it accelerated at the rate of -1.5 m/s2. What would the coefficient of friction between the book and the floor be?

## Homework Equations

F = ma

W = mg

FN = - mg

## The Attempt at a Solution

m=.400

fa: 5N

FN= 3.9 N

A: -1.5m/s

Can someone please explain how I should be finding the force of friction?