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![[Post New]](/templates/default/images/icon_minipost_new.gif) 6 Apr 2008 12:24:09 IST
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Assuming there is no other body exerting force(s) on the bodies, then there is no net external force.Hence CoM remains at rest.
Now inital energy 0.
0 = mv^2 - Gm^2/r
root(Gm/r) = v
So momentum = mv = root(gm^3/r)
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