From: fortunati.luigi@gmail.com   
      
   Edward Prochak ha scritto :   
   > Okay, I'll try.   
   >   
   > since the two forces are not equal, I think it is safe   
   > to rule out that this is a statics problem (or this is   
   > is an unusual spring).   
   >   
   > Now when you state a train "exerts a force", precisely   
   > how is that determined/located?   
   >   
   > Is it the force at the contact point of the front of   
   > the train and and the spring? Or is it measured   
   > at the point between the wheels and the track?   
   >   
   > how fast are the trains actually moving?   
   > What is the spring constant?   
   > What is the mass of the spring?   
   >   
   > As I look at this, there are just too many unknowns   
   > to analyze. I could write an argument to support   
   > either option. Could you supply more information please?   
      
   The trains are initially stationary (no speed) and the difference   
   between the two forces is determined by the different power of the two   
   engines in the proportion of 15 to 10.   
      
   Everything else is irrelevant.   
      
   --   
   - Luigi Fortunati   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)