A negative 58µC point charge is 48cm away from the center of a positively charged sphere with radius 4cm and charge density 60µC/m^3. What is the work done by electric field to put the point charge on the surface of sphere? (k=9*10^9Vm/C)

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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.