A CST (Constant Strain Triangle) plane stress element with a 10 mm constant thickness has the following properties: Coordinates of nodes 1, 2, and 3 respectively: (5 mm, 15 mm), (15 mm, 5 mm), (25 mm, 15 mm) Displacements of nodes 1, 2, and 3 respectively: (0.005 mm, 0.002 mm), (0.0 mm, 0.0 mm), (0.005 mm, 0.0 mm) Modulus of Elasticity=70 GPa; Poisson's Ratio=0.3 Determine: 1. the stresses in the element, 2. the von Mises stress in the element, 3. the element stiffness matrix, 4. and the nodal forces that cause the given displacements.