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in a high-energy collision of a primary cosmic-ray particle near the top of the Earth’s atmosphere, 120 km above sea level, a proper is created with a total energy of 135 GeV, traveling vertically downward. In its proper frame this poin decays 35.0 ns after its creation. At what altitude above sea level does the decay occur? The rest energy of a pion is 139.6 MeV.
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