Asked by Anonymous

A cosmic ray travels 59.1 km through the earth's atmosphere in 507 μs, as measured by experimenters on the ground. How long does the journey take according to an observer in the rest frame of the cosmic ray?
Answered by oobleck
59.1km / 507μs = 1.166*10^8 m/s = 0.389c
so use that for time dilation
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