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Homework Statement
A book has a mass of 400 g. When you slide the book against the floor with 5 N, it accelerated at the rate of -1.5 m/s^2. What would the coefficient of friction between the book and the floor be?
Homework Equations
Ff = μFN
The Attempt at a Solution
I am trying to learn physics on my own solely through whatever reliable resources i may stumble upon on the internet. So bear with me if my answer or my method is not correct. Anything I know about physics is self taught(trying to prepare for college)
I tried it a few different ways
Ff = μFN
5N=μ(.4x9.8)
5N=μ(3.92)
5N/3.92=μ
1.276=μ
5N=μ(.4x-1.5)
5N=μ(2.666[STRIKE]6[/STRIKE])
5N/-.26666[STRIKE]6[/STRIKE]=μ
8.75=μ (i know this can't be right)