Two full-sized a × c-mm boards are nailed to a b x c-mm board and the resulting beam that is subjected to a vertical shear of 1700 N. Knowing that the allowable shearing force in each nail is 75N, determine the allowable spacing s that can be used between each pair of nails. Asume a=55 mm, b=55 mm and c=95 mm. Using a suitable cutout, passing through only the nails, the first moment of the area about the z-axis is calculated as x10-4 (m3)