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(A) For a particle moving in a circular path with constant speed,the motion is known as uniform circular motion.In uniform circular motion,the acceler

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$\pi$

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(A) For a particle moving in a circular path with constant speed,the motion is known as uniform circular motion.In uniform circular motion,the acceleration is purely centripetal,meaning it is directed towards the centre of the circular path.The position vector of the particle with respect to the centre of the circle is directed radially outward from the centre to the particle's position.Since the acceleration vector points towards the centre and the position vector points away from the centre,these two vectors are anti-parallel.Therefore,the angle between the direction of acceleration and the position vector is $180^{\circ}$ or $\pi$ radians.

If a particle is moving on a circular path with constant speed,then the angle between the direction of acceleration and its position vector w.r.t. the centre of the circle will be ............

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