Slime wrote:
> 
> >   #declare V = 0.9*V;
> 
> This is physically accurate.
> 
> >   #declare V = pow(V, 0.9);
> 
> This is not.
> 

In fact neither of them is.

In the general case the force generated by air resistance is a quite
complicated function of the speed.  At low speeds it can be approximated
by a force proportional to the speed (the first of the cited formulas).

Christoph

-- 
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