If the mean velocity adjacent to the top of a wing of \(1.8 \mathrm{~m}\) chord is \(40 \mathrm{~m} / \mathrm{s}\) and that adjacent to the bottom of the wing is \(31 \mathrm{~m} / \mathrm{s}\) when the wing moves through still air at \(33.5 \mathrm{~m} / \mathrm{s}\), estimate the lift per meter of span.