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I honestly have no idea how to go about solving this. I know the velocity is 6.7 m/s (but is it final or initial or both?). I also know gravity is 9.8 m/s. But I don't know anything else?

I know the equation for conservation of energy is PEf+KEf = PEi+KEi. I know PE= mgh and KE= .5mv

^{2}However, I have no idea how to do this because I don't have the height or the mass, and I don't know if 6.7 m/s is the initial, final, or both. I'm just completely lost.

Please help! Thanks!