Question: 4-8. A K+ meson is created using the Fermilab synchrotron in Batavia, Illinois. In its own rest frame the K + meson decays into two

4-8. A K+ meson is created using the Fermilab synchrotron in Batavia, Illinois. In its own rest frame the K + meson decays into two at mesons in a time 12.4 ns = 12.4 x 10-'s. How fast is it traveling in the laboratory if it moves a distance d = 10.0 m before decaying

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