Nonconservative/work theorem problem.

[neoncrazy101]

Homework Statement

Starting from rest, a 98-kg firefighter slides down a fire pole. The average frictional force everted on him by the pole has a magnitude of 780 N, and his speed at the bottom of the pole is 3.4 m/s. How far did he slide down the pole?

Homework Equations

Not sure? Maybe, W_wc = 1/2mv_f² + mgh_f - 1/2mv_o² + mgh_o

The Attempt at a Solution

I have no idea where to start...

 

[Mindscrape]

The idea is that we'll ignore the other non-conservative force losses and assume that friction is the one non-conservative force that makes the fireman not fall as if he simply jumped down. So the total work is the work from gravity plus the work from friction.