A car is moving along the circle x^(2)+y...

A car is moving along the circle `x^(2)+y^(2)=a^(2)` in the anti-clockwise direction with a constant speed. The x-y plane is a rough horizontal stationary surface. When the car is at the point (`a cos theta, a sin theta `), the unit vector in the direction of the friction force acting on the car is

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