Physics
posted by Kayla on .
If a 20 kg object fell to the surgace of the Earth from a height of 30m, what would its final velocity be? (work from the energy standpoint)

the PE is mgh
the KE is 1/2 m v^2
set equal, and solve for v. 
Could you explain. I'm stuck. I got 30 v^2 so far but I don't think that is right.