Second Proof of Energy Error. Energy Misdefined in Physics Second Proof Home Page 1.
Power is rate of energy addition.
With the usual definition of energy, power is proportional to force times velocity. As velocity varies, the power varies. Mathematically, the power of the rocket mass and exhaust mass are added to create the constant power. The velocity of the exhaust decreases at the same rate the velocity of the rocket mass increases, which shows a constant power. But there is a problem with that analysis.