tudent wanted to test how the mass of a paper airplane affected the distance it would fly. Paper clips were added before each test flight. As each paper dlip was added, the ne was tested to determine how far it would fly. What is the dependent variable in this experiment? O The paper clip The type of plane that was made The mass of the paper airplane The distance the plane will fly

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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.