Given values: m1 = 10kg, r1=75 cm,  m3=20kg, r3=25cm, m4=5kg, had to find the value of r4=? I got r4=50cm m1 = 10 kg at r1 = 75cm m3 = 20 kg at r3 = 25cm m4 = 5 kg at r4 = 50cm   1. Compute the theoretical value of r4 using the following equation: r1m1 = r3m3 + r4m4 Substitute the values of r1, r3, m1, m3, m4 and solve for r4 theoretical value and find r4 experimental value

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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.