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Originally Posted by Caleb Fulton
but you still need to know the mass of the rods!
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Right Caleb
As for ggoldman, as long as we are supposed to "Assume g=9.80 m/s^2" the objects should fall independent of height as well. The right-hand side of the equation you provided is just a gravitational potential energy term. All energy terms are relative and therefore useless unless you are trying to create a system and conserve the energies.