Nitrogen flows in a constant-area duct. Conditions at section 1 are as follows: p1 = 200psia, T1 = 90°F, and V1 = 10 ft/sec. At section 2, we find that p2 = 45 psia and T2 =90°F. Determine the velocity at section 2.(Nitrogen : R = 55.1 ft-lbf/lbm-°R)