How High Was the 200kg Mass Dropped to Achieve 400J of Kinetic Energy?

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Homework Statement



Just before striking the ground, a 200kg mass has 400J of KE. If friction can be ignored, from what heigh was it dropped

Homework Equations



KE = (1/2)mv^2
PEg = mgh

The Attempt at a Solution



I drew a mass of 200kg and I drew the normal force at the top as well as the force of gravity (mg) at the bottom. My force of gravity = 9.81 and I know the KE = 400J I don't know what equation to use in order to find my height.
 
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