3) The weight W of the building in figure below is 200 kips. The building is set into free vibration by releasing it (at time t = 0) from a displacement of 1.20 in. If the maximum displacement on the return swing is 0.86 in at time t 0:64 sec. determine: (a) the lateral spring stiffness k, (b) the damping ratio . (c) the damping coefficient c. Weight W-mg pjacking force