Work with drag problem. Blimp being pulled downward.

[gabbiegirl]

Homework Statement

A blimp of mass 110 kg is pulled at an angle of 52 degrees downwards with respect to the horizontal for D=7 km on level ground at a constant velocity v=14 m/s. If the coefficient of drag (K in F=Kv^2) is 0.5 kg/m, how much work is done by the person pulling?

Homework Equations

F=w*d
F=Ky^2

The Attempt at a Solution

I don't even know where to begin! So confused.

 

[Simon Bridge]

Start by drawing a free-body diagram with all the forces.