From: fortunati.luigi@gmail.com   
      
   Tom Roberts a écrit   
   >> The electric little train A exerts a force 15 directed to the right on   
   >> the end A of the spring AB while the train B (on the same rail) exerts   
   >> a force 10 towards the left on the end B of the same spring:   
   >> Train-A>A----------B   
   > I assume your context here is Newtonian mechanics.   
      
   Yes.   
      
   > You don't give a unit for the forces, so I assume the same (unnamed) unit   
   > applies to all.   
      
   Yes.   
      
   > I also assume this is a steady state, and the spring is neither collapsing   
   > nor stretching.   
      
   Steady state?!?   
      
   How is it possible that the spring can reach the steady state with the   
   A train that "pushes" more than the B train with the proportion of 15   
   to 10?   
      
   --   
   - Luigi Fortunati   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)