Online Course Support | Understanding Einstein: The Special Theory of Relativity

Consider person #1 moving to the right (positive x direction) at a constant velocity v with respect to person #2. Assume that at time t = 0 the two were side by side. Each person measures distances using the same units (such as meters), and each person uses their own location as the origin for their measuring system. Let the measurements of person #1 be represented by x1 and the measurements of person #2 be represented by x2. Consider an event that happens at some position x2 and time t (after time t = 0), according to person #2. Person #1 measures the location of this event at position x1. Would the value of x1 be greater than or less than x2?

 

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