Gab, a professional rooftop futbol player, kicked a 0.45 kg ball off a rooftop that is 81 m off the ground, at 15 m/s oriented 45° above his horizon. His pal, Henry, caught the ball from a window at a distant building that is 46 m off the ground. Henry then released the ball from this height and let the ball fall to the ground. A. What is the speed of the ball just before it reaches Henry? B. What is the speed of the ball just before it reaches the ground

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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.