On September 15, 1896 in near Waco, Texas, William George Crush parked two locomotives at opposite ends of a 6.4-km-long track, fired them up, tied their throttles open, and then allowed them to crash head-on at full speed (as seen above) in front of 40,000 spectators (more people than lived in the state’s second-largest city at the time). Hundreds of people were hurt by flying debris; several were killed. Assuming each locomotive weighed 1.2×106N and its acceleration was a constant 0.26 m/s2, what was the total kinetic energy of the two locomotives just before the collision?

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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.