circular motion ferris wheel The Ferris wheel in the figure , which 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. The radius of the wheel is 14.0 m. link for pic How do I Find the magnitude of the passenger's acceleration at this instant. The formula arad=v^2/r does not work. How do I solve it? How do I find the direction of the passenger's acceleration at this instant in degrees to the right of vertical?