This has been tested by many of the car magazines. A Toyota Corolla's brakes are stronger than the engine and will stop the car from 50mph while under full throttle.
Popular Mechanics tested it here http://www.youtube.com/watch?v=NOMYjiCiTYg
Car and Driver tested it and the Corolla stopped only 16 feet longer than with no throttle. http://www.caranddriver.com/features/how-to-deal-with-unintended-acceleration