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Extracted text: Figure (3) shows the arrangement of a set of pulleys, a spring, and a smooth contact position that are connected through a flexible line having a total length of 12 meters, which sustains a box with mass of 15 kg. If the system is known to be in equilibrium, solve for: a) The angle a. b) The force T. 5 4 3.0 m 3.0 m a T 4.0 m Figure (3)