question_answer

   If V is the jet velocity Vo is the Vehicle velocity, the propulsive efficiency of a rocket is given by:

A) \[\frac{2\,\left( {{\text{V}}_{\text{0}}}\text{/}{{\text{V}}_{\text{1}}} \right)}{1+\left( \frac{{{V}_{0}}}{{{V}_{1}}} \right)}\]                       

B) \[\frac{\left( {{\text{V}}_{\text{0}}}\text{/}{{\text{V}}_{\text{1}}} \right)}{1+{{\left( \frac{{{V}_{0}}}{{{V}_{1}}} \right)}^{2}}}\]

C) \[\frac{{{V}_{0}}}{{{V}_{0}}+{{V}_{1}}}\]              

D) \[\frac{{{V}_{1}}}{{{V}_{0}}+{{V}_{1}}}\]