A muon with rest energy 108 MeV is created at an altitude of 4,400 m and travels downward toward Earth's surface. An observer on Earth measures its speed as 0.917c. (a) What is the muon's total energy in the Earth observer's frame of reference? (b) What is the muon's total energy in the muon's frame of reference? (a) The total energy is, E = 152 MeV. (b) The muon's total energy in the muon's frame of reference is, E = 108 MeV.
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