Two spaceships at rest with respect to each other and separated by 1.72 × 108 m launch photon torpedoes at each other 0.140 seconds apart. The crew of a third spaceship moving at speed u relative to the two spaceships and along the line separating them sees these two events occur simultaneously. Determine 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.