What is the kinetic energy in MeV of a -meson that lives 1.40 10 -16 s

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What is the kinetic energy in MeV of a π-meson that lives 1.40 × 10-16 s as measured in the laboratory, and 0.840 x 10-16 s when at rest relative to an observer, given that its rest energy is 135 MeV?

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