A 2.00-kg stone is sliding to the right on a frictionless horizontal surface at 5.0 m/s when it is suddenly struck by an object that exerts a large horizontal force on it for a short period of time. The graph in Fig. shows the magnitude of this force as a function of time. (a) What impulse does this force exert on the stone? (b) Just after the

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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.