A particle is moving with speed v on a circle (of radius r and cantered at origin) . . .

Question : A particle is moving with speed v on a circle (of radius r and cantered at origin) as shown in the given figure, in anticlockwise fashion. Average acceleration of the particle during its motion from point A to point B is 

Doubt by Divya

Solution : 

We know, 

Here the magnitude of velocity of the particle around the circle remains constant which v but the direction changed continously. 

Hence (b) would be the correct option.