At t1 = 1.00 s, the acceleration of a particle moving at constant speed in counterclockwise circular motion is
J1 = -0.01 m/s^2 (5.0 m/s^2)
At t2 = 4.00 (less than one period later), the acceleration is
(500 m/s^2, 9.0 m/s^2)
The period is more than 3.00 s. What is the radius of the circle?