Question: Two observers are moving relative to one another. Which of the following quantities will they always measure to have the same value: (a) Their relative

Two observers are moving relative to one another. Which of the following quantities will they always measure to have the same value:
(a) Their relative speed;
(b) The time between two events;
(c) The length of an object;
(d) The speed of light in a vacuum;
(e) The speed of a third observer?

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