A 3 kg mass and a 10 kg mass are attached to each other by a spring with spring constant k = 300 N/m and placed on a frictionless table, as shown in (Figure 1). The masses are then pressed toward each other in such a way as to compress the spring 0.09 m. Calculate the magnitude of the acceleration of the smaller mass the moment after it is released. (Express your answer in meters per second squared.) Calculate the magnitude of the acceleration of the larger mass the moment after it is released. (Express your answer in meters per second squared.)

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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.