A particle is a bound state of three fundamental point particles, each of which has a mass of 500 MeV. The total energy of the system, that is, the sum of the kinetic and potential energies of all three particles, is −800 MeV. [Remember that a bound system always has negative total energy. The usual nomenclature is that the "binding energy" is 800 MeV, meaning that the work to take the system apart and leave the three constituents at rest a great distance apart is 800 MeV.] Given these facts and background, what would be the observed total mass of the composite particle?

1. 300 MeV.

2. 900 MeV.

3. 800 MeV.

4. 1500 MeV.

5. 700 MeV.

6. 2300 MeV.

an explanation would be appreciated!

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