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2500 J = 1000 J + 1500 J. 1000 J + 1500 J = 2500 J. 2500 J + (-2500) = 0 J.
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Here is an example of something being conserved. Even though the energy at the beginning isn’t the same as the energy at the end, it changed in a predictable and regular way that can be explained due to work done on the system Here is an example of something being constant because the energy in the beginning is the same as the energy at the end Ex: 1 Ex: 2 Very Important