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I am assuming this is a property characteristic of the rocket engine.Consider the main energy changes for two consecutive equal time intervals.For the first interval power times time equals gain of KE(rocket plus gases) and for the second interval the same power times the same time equals an even greater gain of KE.Where does the extra energy come from during the second interval?Clearly so. However in the case of a rocket, a rocket with constant power output will indeed have constant thrust.