(Answered) How fast must a pion be moving to travel 105 m according to

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How fast must a pion be moving to travel 105 m (according to the laboratory frame) before it decays. The average lifetime, at rest, of a pion is 2.60 10-8 s. Give your answer in units of meters per second (m/s) and as a fraction of the speed of light (in other words, V = ? and V/c = ?).

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