A-in-drive socket wrench is shown in the figure below. It is made of ductile low-alloy steel with Sy = 90 ksi. A 180-lb mechanic puts a prop under the extension and then stands on the end of the handle to loosen an obstinate bolt. Is the mechanic close to failing the handle or the extension (check both)? Use max shear stress theory for predicting the onset of yielding. Prop 4 in from bolt head Mechanic stands here -16-in socket extension, d = in 20-in handle, in