From: edprochak@gmail.com   
      
   On Friday, July 13, 2018 at 1:07:42 AM UTC-4, Luigi Fortunati wrote:   
   > 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.   
      
   Okay let me have another go at it:   
   train A has speed 0  at time 0   
   It is under a force of 15 exerted by the spring   
   as the train exerts a force of 15 on the spring   
      
   train B has speed 0 at time 0   
   It is under a force of 10 exerted by the spring   
   as the train exerts a force of 10 on the spring   
      
   At the Instant being considered t=0, the power   
   of the engines is mere obfuscation.   
      
   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"   
      
      
   Not quite sure how to set up such a condition in reality,   
   but it is your dime.   
      
   Thanks for a momentary distraction from work.   
      Ed   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)