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?

>>7

You're a fucking idiot.  How do you not know that Vf and Vi (V subscript f/i) represent velocity final and initial respectively?  My little sister just learned that Vf^2=Vi^2 + 2ax, and she's in 8th or 9th grade physical science.

And in all the physics classes I've taken, I've never once seen 'S' be the standard to represent distance.  I've seen x, d, and r, and that's it.  And your link proves me right on that one you moron.