A plank, fixed to a sled at rest in a stationary frame S, is of length L, and makes an angle of 44' x-axis. Later, the sled zooms through frame S at a constant velocity v parallel to the x-axis and e appears to be 60° relative to the x-axis in frame S. What is the speed of the sled in terms of c d of light in vacuum? Loi

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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.