Newton's second law states F = d(mv)/dt as this law is valid only for constant mass systems it is also written as F = md(v)/dt.(adsbygoogle = window.adsbygoogle || []).push({});

But let's suppose the mass was not a constant, then the derivative of the law would become F = m'v + mv' (where by ' I mean derivative, m' = dm/dt), would that be right?

If the law is valid only for constant mass why are we writing it inside the derivative and only after that we take it out as a constant?

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# Newton's second law clarification - derivative, constant mass

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