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is the following in principle, correct:

Scenario A:------------

1A) A box with mass M contains mass m, their weight is g(m+M)

2A) the mass m is (somehow) converted to energy E=mc[itex]^{2}[/itex]

3A) at this moment, the box still has weight g(m+M)

Scenario B: ----------

1B) A box with mass M has weight gM

2B) external force imparts kinetic energy E to the box, such, that E=mc[itex]^{2}[/itex]

3B) at this moment, the box has weight g(m+M)

Many thanks!

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# Question on Mass-energy equivalence

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