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Originally Posted by threewingedfury
I dunno, I think I messed up - so are you getting the same thing for both rotational and translational?
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you made an unnecessary, and i believe incorrect, substitution in the translational kinetic energy expression. if you write the problem as trans = a*rot - where a is (presumably) some constant unknown factor between the two, you can deduce a value of a.
for the displacement, check this:
problem
i think you'll find something suspiciously similar to your problem there.