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You will know depending on the variables given. If the variables don't quite line up with the energy equation, most likely you will have to use the other one and see if that works. Also make sure you distinguish the variable the problem is asking for.
I think it depends on what the question already gives you data-wise. If one of the equations isn't possible to use because a specific data point isn't given, then switch to the other and see from there.
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