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[Chareyre <question171223@xxxxxxxxxxxxxxxxxxxxx>]

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

Chareyre proposed the following answer:

> I think the velocity after interaction in absolute coordinates should be
> 2.48 (=1.67 + 0.81).

It is now obvious for me that it should not be like that.
Take spheres with initial velocity = 0.
This thinking would give after impact v=0+0.81=0.81, i.e. no bouncing
and the spheres moving at the same speed as the boundary.
This is not what should happen in elastic impacts, clearly. If you need
to compare things, then compare relative to relative.

I tested without damping.

before:
v_sphere = -0.068, v_plate=0.250 -> relative_v=0.318
after:
v_sphere = 0.567, v_plate=0.250 -> relative_v=0.317

Everything is correct. Please, Vadim, close this question if you agree.

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