From: mikko.levanto@iki.fi   
      
   On 28/02/2026 10:48, Luigi Fortunati wrote:   
   > I wasn't very happy with the way this discussion ended.   
   >   
   > The case involved the elastic collision in the animation   
   > https://youtu.be/wl0c6NMysY4 where the two bodies A and B collide at   
   > equal and opposite velocities v and -v.   
   >   
   > In the end, we concluded the discussion by discussing velocities v_A =   
   > +1 m/s and v_B = -1000 m/s, which have nothing to do with what I had   
   > asked, nor with the animation, where the two velocities are equal and   
   > opposite.   
   >   
   > I didn't have the presence of mind to clarify this, but now I'm ready to   
   > do so by discussing the interesting clarifications that other comments   
   > have highlighted.   
   >   
   > We all agreed that (under the conditions of the animation) with the mass   
   > of body A between "m" and less than "3m" both bodies recoil after the   
   > collision, while with the mass of A greater than "3m," body A slows down   
   > but continues to move forward without stopping.   
   >   
   > What if the mass of body A is exactly equal to "3m"?   
   >   
   > In this case, it doesn't go back or move forward.   
   >   
   > So it stops.   
   >   
   > But where does it stop?   
      
   It stops at the last place where somthing can change its motion.   
      
   --   
   Mikko   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)