Classical physics

A husky exerts a constant horizontal pulling force of 160N over a distance of 15m on a loaded sledge of mass 100kg on snow. The sledge accelerates from rest to a speed of 4.0m/s. What is the work done by the husky against the friction on the sledge?

>>2
1: You stupid asshole. You piece of shit. Use physics symbols.
http://www.rwc.uc.edu/koehler/biophys/symb.html
S = distance, Vf?? Vi?????? WHAT IN THE FUCK???????? Twat.
2: Don't try to prove something like you're a cock sucking bitch with self asteem issues, everyone knows this is just a text book question, just do the math.

F = 160N
S = 15m
M = 100kg
V = 4, V^2 = 16
E = FS = 2400
Ek = 0.5mv^2 = 0.5*100*16 = 800
Energy lost to friction = 2400-800 = 1600 Joules