An unknown particle collides with its antiparticle and the two are annihilated, emitting two photons, each with

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An unknown particle collides with its antiparticle and the two are annihilated, emitting two photons, each with energy 3.0 MeV. Assume the unknown particles are moving very slowly before annihilating. What is the rest mass of the particle, in kilograms?

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