A person walks from point A to point B along an unknown path. What definitive statement can we make about their displacement and distance?  The displacement is always equal to the distance traveled.  The displacement can be either greater than, smaller than, or equal to the distance traveled.  The displacement is always less than the distance traveled.  The displacement is either less than or equal to the distance traveled.

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Proper Length

The theory of special relativity explains the connection between space and time to objects that move in a straight line at a constant speed. The objects move at the speed of light. When an object approaches light speed, its mass is endless and cannot move faster than light. The most crucial postulate of Einstein's special relativity is that the laws of nature do not change in each frame of reference.