Question #171223 on Yade changed:
https://answers.launchpad.net/yade/+question/171223

Chareyre proposed the following answer:
Vadim,

I think the result is physically correct. If you think in a moving frame of 
reference, you get incident velocity = 2.48 and post-impact velocity  
3.19-0.81=2.38.
I guess you have a little bit of damping that can explain the speed decrease?

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