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				Calling All Mechanical Engineers - HELP
			 
 I need to figure out how to calculate the force in lbs exerted by dropping a 500lb weight approx 4ft.   For simplicity sake - figure you're at sea level and don't worry about centrifical force exerted by the spinning earth.  
 FYI - Im replacing a part of a drop hammer and I need to know how much force is being exerted by the drop.
 
 Thanks
 Dave
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