Derive Ciolkovski's formula

1. The problem statement, all variables and given/known data
The mass of a rocket, including a full chamber of fuel, is M. Its net mass without fuel is m. The products of combustion are ejected with velocity c. If the rocket starts from rest, derive Ciolkovski's formula.


2. Relevant equations
N/A. This is actually from differential equations textbook, and it did not give Ciolkovski's formula. I googled Ciolkovski's formula, but I am trouble finding it...


3. The attempt at a solution
I have no idea how to approach this problem. I do not have enough physics background knowledge to begin the problem :[ please help me...
 
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