| Re: How extreme do you want to get?
It shouldn't be too hard to work out.
Look a up a standard atmosphere table to see how density increases as altitide decreases.
You know the start point and the initial acceleration.
Determine the coefficeint of drag the body (although this is complicated by the transfer trhough subsonic to transonic and into supersonic flight regimes).
If you know the Drag Coefficient, dimesnions of the body, the initial accelaration and altitude you can determine air density and velocity of the body and thus the forces acting upon it at any point which allows you (until shock formations screw things up) to do a series of iterations ot find the point where maximum velocity is reached.
Actually that's not easy.
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