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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)

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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.

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