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The first thing observe is that we are being asked to use a specific approach in order to solve for both x and y , hence we should not approach this question via elimination of a single variable, though it i...

Simply put energy is the thing that makes matter move, or has the ability to make matter move.

Energy that cannot do work, often compared to the disorder of a system. Total entropy can never decrease.

A transfer of energy via a current

A force between moving charges