Physics - Fluid Question with Solution | TestHub

The aerofils are so designed that $P_{\text{upper side }}<P_{\text{lower side }}$ so that the aerofils get a lifting force in upward direction. According to Bernoulli's theorem, where the pressure is large, the velocity will be minimum or vice-versa. Thus, $v_{\text{upper side }}>v_{\text{lower side }}$