24. A subatomic particle with mass of 3.0 GeV/c² has been detected to have a kinetic energy of 2.0 GeV from a ground-based observer. If the lifetime of such particle is 0.1 micro second at its rest frame, how long does it fly measured from the observer?
(A) 24 m
(B) 30 m
(C) 40 m
(D) 50 m.

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