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A radioactive nucleus moves with a constant speed of 0.240c along the x axis of a reference frame S fixed with respect to a laboratory. It decays by emitting an electron whose speed, measured in a re4ference frame S’ moving with the nucleus, is 0.780c. consider first the cases in which the emitted electron travels (a) along the common xx’ axis and (b) along the y’ axis and find, for each case, its velocity (magnitude and direction) as measured in frame S.(c) Suppose, however, that the emitted electron, viewed now from frame S, travels along the y axis of that frame with a speed of 0.780c. What is its velocity (magnitude and direction) as measured in frame S’?
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