1. The Ferris wheel [...] rotates counterclockwise, is just starting up. At a given instant, a passenger on the rim of the wheel and passing through the lowest point of his circular motion is moving at 3.00 m/s and is gaining speed at a rate of 0.500 m/s^2 . 2. Find the direction of the passenger's acceleration at this instant. 3. My attempt was using: the arctan 0.64/0.5, and that yielded ~52.0° but no dice so, could someone help me?