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## Homework Statement

While walking down the hallway, a student drags his 4kg school bag. The force on the bag is 20N [60 degrees above the horizontal]. If the bag moves at a constant speed, what is the coefficient of friction?

## Homework Equations

Fn = Fg-Fasintheta

Ff = u(Fn).

## The Attempt at a Solution

Well, I found Fg to be aprrox. 39.2N, then I found Fn to be approx. 21.9N. Now I'm stumped. Any help would be appreciated.