From: fortunati.luigi@gmail.com   
      
   In the animation https://www.geogebra.org/classic/qwsbenj2, body A of   
   mass mA = 6 kg collides with body B of mass mB = 3 kg.   
      
   The force F1 pushes body B to the right, while the forces F2 and F4 push   
   body A to the left.   
      
   Instead, the force F3 pushes both body A and body B to the right.   
      
   Can you determine how much of the force from F3 contributes to pushing   
   body B?   
      
   Luigi Fortunati   
      
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