Asked by Susan

Two events occur simultaneously on the x axis of reference frame S, one at x = −a and the other at x = +a. According to an observer moving in the positive x direction:

A. the event at x = +a occurs first
B. the event at x = −a occurs first
C. either event might occur first, depending on the value of a and the observer’s speed
D. the events are simultaneous

The correct answer is A.
Why is it not B?

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