The most important reason an object is observed to be shorter in a frame where it is moving than in a frame where it is at rest is that

A. The force of motion strongly compresses an object that is moving at relativistic speeds.
B. “Simultaneity” is not a frame-independent concept.
C. The measuring sticks used by the moving observer are Lorentz-contracted.
D. The clocks used by the moving observer run slower.


B. “Simultaneity” is not a frame-independent concept.

Physics & Space Science

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