Quote:
Originally Posted by Oblarg
Nope, not quite! You're making it a bit harder than it has to be by attempting to calculate from the forces themselves - rather, try to think of a way that you can find the answer simply by analyzing the system in two states only (initial, and final). Placement of the origin is crucial to simplifying the problem.
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I'm not entirely sure what you mean by trying "to calculate from the forces themselves" (I only mentioned a force at all so that I could create the equivalency; there may be some convenient equation that already takes that into account). My issues resulted from a couple of silly mental errors in typing out the solution (I shouldn't solve equations in text editors).