Calculating Centripetal Acceleration Angle for a Race Car on a Circular Track

[H2Owned]

Homework Statement

A race car starts from rest on a circular track. The car increases its speed at a constant rate at as it goes 2.25 times around the track. Find the angle that the total acceleration of the car makes with the radius connecting the center of the track and the car at the moment the car completes its trip of 2.25 times around the circle.

Homework Equations

Im not sure

The Attempt at a Solution

I don't even know how to begin

 

[aim1732]

Assuming the constant rate is w.r.t time you would have to calculate tangential and radial acceleration and then divide them for the tangent of angle b/w them.Tangential acceleration is given constant but radial component changes with time so you would have to calculate time too. Use kinematics for that.