An electron and a positron an antielectron make a head-on, Ask an Expert

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An electron and a positron (an antielectron) make a head-on collision, each moving at v=0.99999c. In the collision the electrons disappear and are replaced by two muons (mc^2=105.7 MeV), which move off in opposite directions. What is the kinetic energy of each of the muons?

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