A particle known as a pion lives for a short time before, Ask an Expert

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A particle known as a pion lives for a short time before breaking apart into other particles. Suppose it is moving at a speed of 0.978c, and an observer who is stationary in a laboratory measures the particle's lifetime to be 4.00 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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