Internal Combustion Engines
If V₁ is the jet velocity and V₀ is the vehicle velocity, then propulsive efficiency of a turbojet engine is

V₀ / (V₀ + V₁)
2V₀ / (V₀ + V₁)
2V₁ / (V₀ + V₁)
V₁ / (V₀ + V₁)

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