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In a 0.6 m diameter duct carrying air the velocity profile was found to follow the law u=-5r +0.45 m s, where u is

In a 0.6 m diameter duct carrying air the velocity profile was found to follow the law u=-5r +0.45 m s, where u is the velocity at radius r. Determine the volume flow rate of the air and the mean velocity of flow of air.

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