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we all know that a fly can stop a car, using your proof. But the same fly could stop a moped, or a container truck, depending on what it gets hit by.
The fly would stop the vehicle in exactly the same way , therefore because the mass of the vehicle varies the mass of the fly must vary upon impact.
This is also a neat proof of Einsteins theory that gf mass is dependant upon beer.
The same principle applies to something else as well, I think
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