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## Homework Statement

What is the coefficient of friction between the road and the wheels of a 1400kg truck accelerating at 2 m/s/s if the force applied by the engine to the wheels is 4000N.

## Homework Equations

F

_{n}= m * g

F

_{f}= mu * F

_{n}

## The Attempt at a Solution

I do not know how to resolve this as I don't know F

_{f}or mu (i.e. two variables)

Any asisstance (not answer) would be appreciated.