# Energy Equation problem.

The question I have is trying to solve the final velocity in an energy equation that goes like this: 0.5mv^2=0.5mv^2+mgy (The final velocity being on the LS).

I'm not given the mass of the skier going down the hill so I divide to cancel the mass out. I then rearrange to get Vf^2 = V^2+gy. I've pretty much nailed it down to a simple algebra problem but I can't see what's wrong!

Oh, I might add that I always plug numbers in before rearranging equations but my teacher doesn't like me doing that.

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## Answers and Replies

PhanthomJay
$$0.5V_f^2 = 0.5V_o^2 + gy$$ you left out that 0.5 factor.