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[vadim <question171223@xxxxxxxxxxxxxxxxxxxxx>]

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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