question_answer

The speed of air flow on the upper and lower surfaces of a wing of an aeroplane are \[{{v}_{1}}\] and \[{{v}_{2}}\] respectively. If A is the cross-section area of the wing and \[\rho \] is the density of air, then the upward life is

A)  \[\frac{1}{2}\rho A({{v}_{2}}-{{v}_{1}})\]

B)         \[\frac{1}{2}\rho A({{v}_{1}}+{{v}_{2}})\]

C)  \[\frac{1}{2}\rho A(v_{1}^{2}-v_{2}^{2})\]

D)         \[\frac{1}{2}\rho A(v_{1}^{2}+v_{2}^{2})\]