Extracted text: 2 kN The beam is made of three boards nailed together to form the double-T cross section shown. If the allowable shear force in each nail is 400 N, determine (a) the absolute maximum shear stress in the wood, B (b) the required spacing s, of the nails between A and B, 2 m 1 m (c) the required spacing sy of the nails between B and C. -150 mm- T25 mm 200 mm 25 mm 25 mm