An airplane makes a gradual 90.0° turn while flying at a constant speed of 200 m/s. The process takes 20.0 s to complete. For this turn, the magnitude of the average centripetal acceleration of the plane is
O 10.3 m/s²
O 0.00 m/s²
O 40.0 m/s²
O 20.5 m/s²
O 15.7 m/s²