Trying to find how much work is done by friction

[fvjjk]

Homework Statement

A man drags a table 4.05 m across the floor, exerting a constant force of 51.0 N, directed 25.0° above the horizontal.

How much work is done by friction? Assume the table's velocity is constant.

Homework Equations

work= umgxsin$$\vartheta$$
f=uF

The Attempt at a Solution

I don't understand how I am supposed to find the coefficient of friction without knowing what the mass is.

 

[Lok]

E=F*x
Energy=Force*distance

The Force and distance need to be parallel and that is where the 25'deg angle comes into play.

No need for mass, as people are fat enough.

Have fun!