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[tex]

0 = \frac{[(M - \Delta M)(v - \Delta v) + \Delta Mu] - Mv}{\Delta t}

[/tex]

Then to find the thrust you use this equation:

F

_{thrust}= [tex]qV_e + (P_e - P_a)A_e[/tex]

Where q is the rate of the ejected mass flow which I want to find out.

This is where I got the information: http://www.braeunig.us/space/propuls.htm