The efficiency of jet propulsion for a ship with inlet orifices at right angles

Question

The efficiency of jet propulsion for a ship with inlet orifices at right angles to the direction of motion of ship is given by

Options:

A . [2(Vr - v) v]/ Vr²

B . [2(Vr + v) v]/ Vr²

C . [(Vr - v) v]/ Vr

D . [(Vr + v) v]/ Vr

Answer: Option A

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