On a frictionless horizontal air table, puck A (with mass 0.248 kg) is moving toward puck B (with mass 0.375 kg ), which is initially at rest. After the collision, puck A has velocity 0.117 m/s to the left, and puck B has velocity 0.655 m/s to the right. Part A What was the speed vAi of puck A before the collision? • View Available Hint(s) ? VAi = m/s Submit Part B Calculate AK, the change in the total kinetic energy of the system that occurs during the collision. • View Available Hint(s) να ΑΣφ ? AK = Submit

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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.