Answer to Question #19093 in Mechanics | Relativity for john

Question

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?

Answer 1

Obviously, we just have to add their velocities
Magnitude of relative velocity is
50 m/s+70 m/s = 120 m/s