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Muons are elementary particles with a (proper) life-
time of 2.2 us. They are produced with very high
speeds in the upper atmosphere when cosmic rays (high-
energy particles from space) collide with air molecules.
Take the height Lo of the atmosphere to be 100 km in the
reference frame of the Earth, and find the minimum speed
that enables the muons to survive the journey to the surface
of the Earth.

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