In article ,
Ted Edwards wrote:
SimonShabtai Evan wrote:

Also note that these calcuations (from Physics 101; Halliday and
Resnick/Wiley and Sons Inc) do not include atmospheric losses.

But that is a poor approximation for a realistic balistic situation.

Not if you can provide an adequately sized cylinder of vacuum
from the rifle up to the zero-velocity point and back down. :-)

Granted -- with air in the equation, it makes a *big*
difference.

Enjoy,
DoN.
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