> > A body "b" is virtually duplicated in all periods. If the period is > deforming, each duplicate has a different velocity in the global coordinate > system. This is why we have to shift the velocity difference (b1->vel - > b2->vel), in order to define relative velocities as if the bodies were in > the same period. If they are already in the same period, there is no shift. >
Ok, I see (more or less). How many periods do we have? Where is that this is defined? Sorry if I ask. Thanks, Chiara >
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