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Every so often hear things similar to:

We seem to have two competing ideas:

1) E=mc

2) E + mc

A) In equation 1) energy and mass are equivalent (up to a units conversion factor).

B) In equation 2) the sum is conserved--one is changed into the other.

Any disagreement?

The mass lost is due to the energy produced. Mass becomes energy from the equation E=mc

^{2}.We seem to have two competing ideas:

1) E=mc

^{2}2) E + mc

^{2}= constant.A) In equation 1) energy and mass are equivalent (up to a units conversion factor).

B) In equation 2) the sum is conserved--one is changed into the other.

Any disagreement?

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