Two astronauts X and Y of identical mass are connected by a taut cable of negligible mass and are initially at rest with respect to a nearby space station. Astronaut X pulls with considerable force towards herself. Which of the following describes the direction of the velocity of the center of mass of the astronauts after pulls on the cable? a) the center of mass moves towards X b) the center of mass moves towards Y c) the center of mass does not move

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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.