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Best Kinematics

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Best 1 Time dilation

According to Einstein's theory of relativity, time dilation describes how time passes slower for an observer who is moving relative to another observer; the faster the relative speed, the greater the difference.

2 Length contraction

According to special relativity, an object's length appears shorter in the direction of motion when observed by someone relative to whom it is moving at a significant fraction of the speed of light.

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