The center of mass of object A and the center of mass of object B are separated by a distance of R and have a gravitational attraction for each other of F. What is the force of attraction for each other when the distance center to center is reduced to R/2? A F14 B F/2 2F D 4F O O

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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.