5. How does rocket efficiency relate to speed?

There are several efficiencies that play a role in overall performance of a rocket. The propulsive efficiency of a rocket; however, it is an important one that is related to the its velocity. This efficiency increases as the speed of the rocket approaches the speed of the ejected propellant. When the rocket moves faster than the speed of the ejected propellant, the efficiency begins to decrease, because it requires much more energy to gain additional speed. 

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