In deriving the rocket equation, there is one part I don't understand. The velocity of exhaust with respect to the body is assumed to be constant, where:(adsbygoogle = window.adsbygoogle || []).push({});

v(exhaust wrt body)=v(exhaust wrt inertial)-v(body wrt inertial)

So assuming a constant mass flow rate, the rocket propellant exerts a constant force on the rocket and hence in space, uniform acceleration. But how can an observer on the accelerating rocket observe the rocket propellant being ejected with a constant velocity?

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# The Rocket Equation

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