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Rockets work on the conservation of vector energy, cP.

0 = dcP/dr = cdP/cdt=dP/dt = d(mV)/dt = mdV/dt + Vdm/dt=0

Thus, mdV/dt = -Vdm/dt, or (dV/dt)/V = -(dm/dt)/m.

The Rocket's mass accelerates at the rate of the mass changes dm/dt.

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