2. The stepped bar shown in the figure below is subjected to a distributed line force. Assuming linear shape functions, use the principle of minimum potential energy and FEM to a) determine all the nodal displacements and b) the reaction RL. Discretize the structure appropriately with two 2-node bar elements. Assume: E = 270 GPa, the cross section areas of the two portions shown are 1.5x10-5 m3, 10-5 m2. Further, 0 X