Posted by Victoria on Sunday, March 28, 2010 at 4:15pm.
Hold one ball fixed (a virtual fixed).
work the other ball does
work=integral F dx= G.125^2/r^2 dr from 820 to 680
work= -G*.125^2 (1/820-1/680)
figure that out. But we know in the real world, both balls moved, so divide that work by 2 to get the work done on each ball, and that is equal to the KE of each ball.
From KE, get the velocity.
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