A ship with jet propulsion draws water through inlet orifices at right angles to the direction of its motion. The propelling force of the jet is
(where w = specific weight or specific density, a = Area of the jet, v= Velocity of the ship, V = velocity of the jet issuing from the ship, and the Relative velocity of the jet and ship Vr = V + v)
1
waVr/g(Vr + V)
2
waVr/g(Vr - v)
3
waVr/g(Vr + v)2
4
waVr/g(Vr - v)2
5
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