A particle of mass m is moving at a speed of 0.8c. It collides with and merges with another particle of the same mass m that is initially at rest. How much larger than 2m, in %, is the mass of the resulting combined particle?

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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.