Question #171223 on Yade changed:
https://answers.launchpad.net/yade/+question/171223
vadim posted a new comment:
Chareyre,
If the frame of reference is moving (with table, right?), the "post-
impact" velocity has to be 2.48, not 3.19. But what we have here?
1. Before interaction
sphere velocity: -1.67
table velocity: 0.81
2. After interaction
sphere velocity: 3.19 (why not 0.81 - (-1.67) = 2.48 ?)
table velocity: 0.81
The sphere got some extra energy
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