A 5 kg mass moving with the speed 5 m/s collides with 4 kg mass moving with the speed 8 m/s as shown on the diagram below. After the collision, the two masses stick together and mov with velocity u. Find u.

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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.