Vector A, which is shown in the figure, has a magnitude of 10 and a direction angle of 60°. What is the magnitude and direction angle (as measured counterclockwise from the positive x-axis) of –A/2? 60° 5, 240° -5, 60° 5, -30° -5, 240° -5, -30°

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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.