A carnival Ferris wheel has a 15-m radius and completes five turns about its horizontal axis every minute. What is the acceleration of a passenger at his lowest point during the ride? O 4.1 m/s^2 upward 14 m/s^2 downward O 5.7 m/s^2 downward 19 m/s^2 downward O 4.1 m/s^2 downward