A rocket is traveling at speed v along the x axis of frame
A rocket is traveling at speed V along the x axis of frame S. It emits a signal (for example, a pulse of light) that travels with speed c along the y' axis of the rocket's rest frame S'. What is the speed of the signal as measured in S?
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a rocket is traveling at speed v along the x axis of frame s it emits a signal for example a pulse of light that
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