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January 30, 2015

January 30, 2015

Posted by **Victoria** on Sunday, March 28, 2010 at 4:15pm.

a. If the balls are released from rest, what speed do they have when their separation has decreased to 680 m? Ignore the gravitational effects from any other objects.

- Physic -
**bobpursley**, Sunday, March 28, 2010 at 4:27pmHold 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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