Question: The 2009 Coca-Cola 600 was the which number stock car race, of the 2009 NASCAR Sprint Cup Series and the fiftieth iteration of the event, Stock car racing is a form of automobile racing found mainly and most prominently in the United States and Canada, with Australia, New Zealand and Brazil also having forms?
Sentence (from "Stock car racing"): Traditionally, races are run on oval tracks measuring approximately 0.25 to .
Relevant evidence: No