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.... the rest energy mc^2.
Still, the question is whether this form of energy is *in addition to*
the energies we considered previously (like the gravitational energy or
whatever) or *instead of*. That is what I am confused about and how I
could simply explain this to non-scientists.
Consider an astronaut dropping a rock on the moon. While the rock is
falling, how does the kinetic energy of the moon/rock/astronaut change?
How does the rest energy of the moon/rock/astronaut change? Are there
any other forms of energy that are changing?