Please help me. Deadline of this question is 02.06.2024. 

A 20-mm diameter steel bar is being attached to a spring with a stiffness of 50 MN/m by means of its end and is used for load-carrying purposes given in Figure 2. Apart from the contact surface between the spring and the attached bar no other contact surfaces exist. Find the displacement of end A, which is connected to the hook exerting a force of 600 kN, and the stress in the bar. There is no contact between the bar and the support. Is the diameter of the rod suitable for a maximum allowable stress of 150 MPa? If not, what is the appropriate diameter? E-2.1.1011 N/m2. 4() mm k = 50 MN/m 60 kN Note: Construct the model using axial elements. The stiffness matrix of the spring p = / m3 = 9.81m/ s2