The speed of a race car is increased at a constant rate from 65 mph to 80 mph (miles per hour) over a distance of 500 ft along a curve of 800-ft...

The speed of a race car is increased at a constant rate from 65 mph to 80 mph (miles per hour) over a distance of 500 ft along a curve of 800-ft radius. Determine the magnitude of the total acceleration of the car after it has traveled 400 ft along the curve. (circular curvilinear motion)

It's a Dynamics question on curvilinear motion.