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5. A pully system is presented below. There is a 20 kN box hanging on the left end and a spring connected on the right end. Before the box was attached to the left end of the pulley system, the spring had a length of 2 cm. With the box hanging from the pulley, the spring now has a length of 5 cm. The system is in static equilibrium. What is the Hooke's constant k or the spring? (5 pts.) O O O 20 KN