This problem is from the 2015 AP Physics C Mechanics free response, question 3 part b.
K = 1/2Iω2
U = mgh
The Attempt at a Solution
The potential energy of the bar when it's horizontal gets transferred to kinetic energy when vertical, so I originally had the equation mgL = 1/2(1/3ML2)ω2
However, the scoring guidelines say that the change in height should be L/2, not L, resulting in a potential energy of mgL/2. Could someone explain why the change in height should be L/2 and not L?
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