A 500 kg spherical mass and a 300 kg spherical mass are released from rest while their centers are 30 meters apart out in space, far away from any other massive objects. What is the initial acceleration of the 300 kg mass, just after it is released?   a)7.9×10^−9 m/s^2 b)5.2×10^−9 m/s^2 c) 6.4×10^−11 m/s^2 d) 3.7×10^−11 m/s^2

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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.