[RightWhale]

There must be some kind of mass balance. Whatever mass is sent up must be balanced by an equivalent mass coming down. The velocity changes would be positive for one and negative for the other, but balanced.

[robertpaulsen]

I think it would only be balanced when they crossed (ie., at equal altitude).

The cable will be torqued in one direction by the rising object, and in the other by the descending one -- it will look like a 62,000 mile high letter "S".

Ya?