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A particle known as a pion lives for a short time before breaking apart into other...

A particle known as a pion lives for a short time before breaking apart into other particles. Suppose a pion is moving at a speed of 0.994c, and an observer who is stationary in a laboratory measures the pion's lifetime to be 3.1 × 10-8 s. (a) What is the lifetime according to a hypothetical person who is riding along with the pion? (b) According to this hypothetical person, how far does the laboratory move before the pion breaks apart?

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