Finding acceleration using kinetic friction, final velocity, weight, and force

[wowdusk]

Homework Statement

A man pushes a chair that weighs 60N with a force of 25N. The chair has a final speed of 4.0m/s. and a kinetic friction of .27. What is the acceleration?

Homework Equations

i have no idea where to start, i tired this formula that had me find distance but the acceleration on the bottom doesn't rely on the velocity on the top so i figured it was wrong
possibly: x=(Vx^2-Vox^2)/(2ax)?!

The Attempt at a Solution

it seems as if i am missing information/parts
after substituting everything into get the distance i got 5.5633m, but this question doesn't even ask for distance. I spent already over 4 hours on this 1 problem and still no luck, please help.

 

[AtticusFinch]

F = ma right?

So find the frictional force on the chair (coefficient of kinetic friction multiplied to the normal force) and divide by the mass of the chair. That will give you the deceleration of the chair after the man stops pushing on it.