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Physics, 11.06.2021 23:50 koshh4

Alice holds a flashlight motionless in her frame of reference. She shines it toward Bob, whom she measures to be approaching her at a speed of 0.9c, where c is the speed of light in vacuum. She measures the speed of the light leaving the flashlight to be c in her reference frame. Bob sees the light from Alice's flashlight and measures its speed. What speed does Bob measure for the light in his reference frame

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