The figure shows the schematic for the measurement of the velocity of air (density =1.2 kg/m^3 ) through a constant-area duct using a Pilot tube and a water-tube manometer. The differential head of water (density =1000 kg/m^3) in the two columns of the manometer is 10 mm. Take acceleration due to gravity as 9.8 m/s^2. The velocity of air in m/s
A. 6.4 B. 9.0 C. 12.8 D. 25.6
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