From: tjroberts137@sbcglobal.net   
      
   On 7/17/18 2:35 PM, Luigi Fortunati wrote:   
   > Tom Roberts ha scritto   
   >> As I said before, if the mass of the spring is half the mass of train B   
   >   
   > The mass of the spring is negligible.   
      
   Then your initial description of the situation is physically impossible.   
      
   Tom Roberts   
      
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