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?
1) 5.7 m/s2 downward
2) 4.1 m/s2 upward
3) 14 m/s2 downward
4) 4.1 m/s2 downward
5) 19 m/s2 downward
Answer: 2