An electron moves with speed 0.95c. (a) what is the momentum of the electron according to Newton’s mechanics? (b) what is the correct value of the electron’s momentum according to special relativity? (c) Explain in words why the answer to part (b) is larger than the answer to part (a).

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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.