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A uniform rod of length 2a sits on a smooth floor and leans against a smooth...

A uniform rod of length 2a sits on a smooth floor and leans against a smooth wall. The rod is released from rest when it makes downward vertical angle of 60 degrees. Find the energy conservation equation for the falling rod - you don't need to solve this differential equation, just derive it. (Hint: your energy equation should only involve on variable).

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