This ducted propeller unit drives a ship through still water at a speed of \(4.5 \mathrm{~m} / \mathrm{s}\). Within the duct the mean velocity of the water relative to the unit is \(15 \mathrm{~m} / \mathrm{s}\). Calculate the propulsive force produced by the unit. Calculate the force exerted on the fluid by the propeller. Account for the difference between these forces.

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md- P10.80