申論題

2. The ram R shown in Fig. 2 has a mass 200 kg and is released from rest 0.75 m from the top of a spring, A, that has a stiffness k_A = 12 kN/m. If a second spring B, having a stiffness k_B = 15 kN/m, is nested in A, determine the maximum displacement of A needed to stop the downward motion of the ram. The unstretched length of each spring is indicated in the Fig. 2. Neglect the mass of the springs. (25%)