Observer A is stationary in the Earth reference frame, and pilot (mathrm{B}) is flying toward pilot (mathrm{A})

Question:

Observer A is stationary in the Earth reference frame, and pilot \(\mathrm{B}\) is flying toward pilot \(\mathrm{A}\) at relative speed \(v_{\mathrm{AB}}\). What speed does observer \(A\) measure for the speed of the light emitted by a signal light on pilot B's ship?

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