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Problem 4 [25 pts} Work Done by External Forces An object is sliding on a horizontal surface, attached to one end of a spring with stiffness coefficient of k = 400 N/m. The object has a kinetic energy of Kg: 20 J as it passes through the spring's equilibrium position. As the object slides, a constant frictional force of magnitude 10.0 N acts on it. Answer the following: (a) How far (Ax) will the object slide to the right from the equilibrium position before coming momentarily to rest? (15 pts) (b) What will be the kinetic energy of the object as it slides back through the equilibrium position? (10 pts)