Susie Maroney from Australia set a women's record in long-distance swimming by swimming 93.625 km in 24.00 h. a. What was Maroney's average speed? b. If Maroney's mass was 55 kg, what was her kinetic energy?

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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.