5. A sheet of glass measuring 2 m by 200 mm by 2 mm contains a central slit parallel to the 200 mm side. The sheet is restrained at one end and loaded in tension with a mass of 500 kg. What is the maximum allowable length of slit before fracture occurs? Assume plane stress condition and the following material property values: E-60 GPa, surface energy is 0.5 J m² P = 500 Kg Width 200 mm Thickness 2 mm Length 1000 mm 2a = ? E = 60 x 10 Pa = 0.5 J/m² P = 500 Kg