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Continuity equation:

p=density

D/Dt=material derivative

Grad: Gradient

V=Velocity vector

v=volume

so;

(1/p)(Dp/Dt)= -Grad.V

and

p=m/v

then,

(1/(m/v))(D(m/v)/Dt)= -Grad.V

Following is what I can't seem to get correct.

(v/m)(m/v^2)(Dv/Dt)=(-1/v)(Dv/Dt)= -Grad.V

How do we obtain "(m/v^2)"?

I believe I am missing a rule on the derivatives. I just can't remember it and I can't forget this question and move on. Thank you for your help in advance.