What is the speed of a beam of pions

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Reference no: EM13692931

Here is the problem which I am struggling on, please help me!

Problem: What is the speed of a beam of pions if their average lifetime is measured to be 4.50 x10^-8 s? At rest, their lifetime is 2.60 x 10^-8 s.

Please use as much detail as possible in solution!

Reference no: EM13692931

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