Acceleration is defined as the change in velocity, either in its magnitude or direction, or both. Centripetal force is the net force causing the centripetal acceleration of an object in circular motion. It is the rate of change of tangential velocity. Given here is an online calculator to calculate for the centriperal acceleration of an object given the radius and velocity.
Determine the centripetal acceleration of the car given radius as 20 m, and velocity as 29 m/s.
Centripetal Acceleration = V2 / r
Centripetal Acceleration = 20 x 20 / 29
= 42.05m/s2