The velocity time graph of runner is given in the graph. (a) What is the total distance covered by the runner in 16 s ? (b) What is the acceleration of the runner at t = 11 s?

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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.