Deriving Equation: S=W-W2/W-W1=M/M1-M2

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Homework Statement


Derive equation:

S=W-W2/ W-W1= M/M1-M2

Homework Equations





The Attempt at a Solution


 
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Hi, welcome to PF!

Is there a more detailed statement of the problem? Can you at least define clearly what the quantities in the problem are?