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Fu-Kwun Hwang
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 « Embed this message on: February 27, 2011, 01:28:57 pm » posted from:Taipei,T\'ai-pei,Taiwan

Assume a well air sealed piston system:
The initial pressure is $P(0)$, Volume is $V(0)$, initial speed is $v(0)$.
There is a mass with weight $W=mg$ on top of the sealed piston (assume the piston can move freely).
The piston will move down due to external force from weight of the object, so the volume will decrease to $V$,  the drag force is the air pressure $P=P(0)V(0)/V$.

The piston will move down until the pressure force is larger than weight of the object and the object will be de-accelerated to speed V=0. (the simulation is paused when it reach this condition).

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