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Sign convention O.energy['gravWork']
Is there a consensus (outside myself) for the extra minus sign in
O.energy['gravWork'], computed in NewtonIntegrator at [*].
It seems that code line was initially introduced by Vaclav in
GravityEngine in commit [**] (and made finally its way into
As far as I'm concerned, I can not make sense of the comment justifying
that sign, just above [*], neither of a consequent negative power of
weight during some free fall.
see also corresponding file from that time at
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