**1. The problem statement, all variables and given/known data**

"A skier coasts down a very smooth, 10 m high slope. If the speed of the skier on the top of the slope is 5.0 m/s, what is his speed at the bottom of the slope?"

and...

"If the skier has a mass of 60 kg, and the force of friction retards his motion by doing 2500 J of work, what is his speed at the bottom of the slope?"

I just can't seem to figure out what equation to use to figure this out.

Help!

Thanks SO much!