The drawing shows a device that you can make with a piece of cardboard, which can be used to measure a person's reaction e. Hold the card at the top and suddenly drop it. Ask a friend to try

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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.