From: fortunati.luigi@gmail.com   
      
   Edward Prochak a écrit   
   > ...   
   > The spring is not at equilibrium, obviously,   
   > so the conclusion is 1   
   > "(1) In point A the spring reacts with force   
   >  -15 to the force 15 of the train A, and in the   
   >  point B with a force 10 to the force -10 of the   
   >  train B"   
      
   Can the "same" spring exert a force 15 on one side and a different   
   force 10 on the other?   
      
   --   
   - Luigi Fortunati   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)