if p is momentum then dp/dt = f right?(adsbygoogle = window.adsbygoogle || []).push({});

I've heard that dp/dt can be written as f = m(dv/dt) + v(dm/dt)

Can someone tell me what this actually means, because it would seem that m would be dependent on v and v dependent on m, so im not sure how this would work out.

Also, can someone point tell me some important equations for springs other than f= -kx and e = .5kx^2

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# A few general Qs about momentum and springs.

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