Newton’s second law

$\begin{aligned}{{F}_{net}}=\frac{dp}{dt}\end{aligned}$

$\begin{aligned}{{F}_{net}}&=\frac{d(mv)}{dt}\\&=m\frac{dv}{dt}\\&=ma\end{aligned}$

For a body with “changing” mass but “constant” v, the second law is reduced to F_net = vdm/dt

$\begin{aligned}{{F}_{net}}&=\frac{d(mv)}{dt}\\&=v\frac{dm}{dt}\end{aligned}$

$\displaystyle \text{Imp}={{F}_{net}}\Delta t=\Delta p$

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