Question

who developed relativistic mechanics
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Answer 1

Answer:

Development of the special theory of relativity. Since the time of Galileo it has been realized that there exists a class of so-called inertial frames of reference—i.e., in a state of uniform motion with respect to one another such that one cannot, by purely mechanical experiments, distinguish one from the other.

Answer 2

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Development of the special theory of relativity. Since the time of Galileo it has been realized that there exists a class of so-called inertial frames of reference—i.e., in a state of uniform motion with respect to one another such that one cannot, by purely mechanical experiments, distinguish one from the other.