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## Homework Statement

Ben pushes a box along a floor against a constant force of friction. When Ben pushes with a horizontal force of 75N the acceleration of the box is 0.5 m/s/s; when he increases the force to 81N the acceleration is 0.75m/s/s.

## Homework Equations

Find the mass of the box and the coefficient of friction between the box and the floor.

## The Attempt at a Solution

i used the formula ma = uk*mg and that allows to cancel out mass and get a/g = uk

with that i get .051 but i really dont think that is right im not really sure where the 2 different accelerations and forces come into play...