1. Jan 19, 2015 #1

   eddie

   

   If a gun fires a bullet at a velocity v and is then taken aboard a plane travelling at a velocity v and is fired again in the direction of travel ,what is the simplest proof that the bullet's new velocity is now 2v ?

    

   eddie, Jan 19, 2015
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3. Jan 19, 2015 #2

   A.T.

   

   Science Advisor

   Gold Member

   See:
   http://en.wikipedia.org/wiki/Galilean_transformation
   
   But note that it only apples when v << c.

    

   A.T., Jan 19, 2015
4. Jan 19, 2015 #3

   eddie

   

   Thanks for your reply I was looking for a simple proof using Newton's Laws of motion.

    

   eddie, Jan 19, 2015
5. Jan 21, 2015 #4

   Dale

   

   Insights Author

   Staff: Mentor

   Newton's laws are invariant under a Galilean transformation.

    

   Dale, Jan 21, 2015

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