In the diagram below a car starts from rest at point A which is 37.5 m above point C. It then slides down the hill, travels around the loop. When the car is at point B, it is going the minimum possible speed it could be going without falling. After completing the loop, it compresses a 294,000 N/m spring 6.9 m. Assume there's no friction present. A.) Determine the loop's radius. B.) Determine the car's mass.

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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.