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		 I know adding energy causes added mass. 
 
But a closed system should not have a mass change.  Converting gravitational potential energy into kinetic energy shouldn't cause a mass change. 
		
		
		
		
		
			
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				Last edited by JHVH : 10-29-4004 BC at 09:00 PM.  Reason: Time for a rest.
			 
		
		
		
		
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