For the more mathematically minded of you, this is a simplified theoretical (ideal) model, developed by Codrin Draghici (1st Dan), of the first part of the Irimi Nage Ura technique.
“It can be open to discussion and may not be entirely valid in practice, as there are some other forces involved (e.g. all sorts of frictions and collisions). Irimi Nage will work in slightly different conditions as well, this is only one view as to what the optimum “parameters” should be.”
Don’t worry – You don’t need to know any of this in order to master this technique.
