From: fortunati.luigi@gmail.com   
      
   In my animation https://www.geogebra.org/m/qterew9m the momentum of   
   body A before the collision is p=mv=15v.   
      
   After the collision, the momentum of body A is reduced to   
   p=m*(1/4)v=15*(1/4)v=(15/4)v=3.75v   
      
   During the collision, body A lost a momentum equal to 15v-3.75v=11.25v   
      
   Where did this momentum lost by body A during the collision go?   
      
   Luigi Fortunati   
      
   [[Mod. note --   
   Hint: What is body B's mass?  What was its velocity before the collision?   
   What is its velocity after the collision?   
   -- jt]]   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)