>   #declare V = 0.9*V;


This is physically accurate.

>   #declare V = pow(V, 0.9);

This is not.

The only difficulty with V=V*.99 is that the constant (.99) changes
depending on the framerate.

> The question is, does air resistence slow something down more at high
speed?

Well, yeah, but only because (1-.9)* a high speed is greater than (1-.9)* a
low speed.

 - Slime
[ http://www.slimeland.com/ ]

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