A cube has a volume of 1.2 cm° and a mass of 7.3g when at rest on the Earth. If this cube is now given a speed u = 0.75c, what is its density as measured by a stationary observer? Note that relativistic density is defined as ER/c2V. State your answer in %3D alcm3 to the nearest01g/cm3

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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.