The energy of each is 1.711 MeV
According to the rule of conservation of energy, energy can only be transformed from one form of energy to another and cannot be created or destroyed. This indicates that unless energy is added from the outside, a system always has the same quantity of energy.
Energy cannot be created or destroyed, but it can move from one form to another, according to the physical rule of conservation of energy
the kinetic energy of positron and electron = 1.2 MeV
Rest energy of the electron and the positron = 0.511 MeV
0.511+0.511+1.2+1.2/2=1.711 MeV
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