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Answer on Mechanics | Relativity Question for john

Question #19093
two trains move on parallel tracks in opposite directions away from each other. one moves at the rate of 50m/s, while the other moves at 70m/s. what is the magnitude of the velocity of each train relative to the other?
Expert's answer
Obviously, we just have to add their velocities
Magnitude of relative velocity is
50 m/s+70 m/s = 120 m/s

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