Question a subatomic particle with a rest mast of 140106, Ask an Expert

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Question: A subatomic particle with a rest mast of 140.106 eV/c² (a pi-zero) can decay into two equal particles, e.g. two photons or an electron plus an anti-electron (which has the same mass).

Part A: How much total energy has each of the two decay particles?

I need help to find how much total energy has each of the two decay particles.

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