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An automobile whose speed is increasing at a rate of 0.600 m/s2 travels along a circular road of radius 20.0 m. When the instantaneous speed of the automobile is 3.00 m/s, find the tangential acceleration component.

Magnitude.

... i know that the tangential acceleration = radius (angular acceleration) , but i am having trouble understanding the actual computation of tangential acceleration. i picked up a couple of books, and i'm still pretty lost.