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A specific reference frame that describes its coordinates in a manner that does not depend on time and is isotropic.

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Two-Dimensional Lorentz Velocity Transformation Problem

Two spaceships A and B are approaching along perpendicular directions, as seen from earth. If A is observed by a stationary Earth observer to have velocity $𝑢_𝑦$ = -0.90c and B to have veloc …
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