2B. A 3m x 3m rectangular plate having a thickness of 10mm is designed to have the corners sheared off (see dotted lines on original plate to form a plus-shaped plate as shown. Assuming a failure shear stress of the plate of (fail) 100 MPa (or 100x106 N/m), determine the minimum punching force in kN required to shear off the corners. If a 0.5m diameter center hole was to be sheared in a separate punch, determine the minimum punching force required for just the center hole. (6 pts) 3m BEFORE 1m 1m 1m AFTER 3m