(D) In a uniform circular motion,the velocity vector changes direction continuously,but its magnitude remains constant.For one complete revolution,the

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(D) In a uniform circular motion,the velocity vector changes direction continuously,but its magnitude remains constant.For one complete revolution,the particle returns to its initial position with the same velocity vector it had at the start.Therefore,the change in velocity $\Delta \vec{v} = \vec{v}_{final} - \vec{v}_{initial} = 0$.The average acceleration is defined as $\vec{a}_{avg} = \frac{\Delta \vec{v}}{\Delta t}$.Since $\Delta \vec{v} = 0$,the average acceleration over one complete revolution is a null vector.

Class 11 Physics 3-2.Motion in Plane Mix Examples-Motion in Plane

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The average acceleration vector for a particle having a uniform circular motion over one complete revolution is

A
$A$ constant vector of magnitude $\frac{v^2}{r}$
B
$A$ vector of magnitude $\frac{v^2}{r}$ directed normal to the plane of the given uniform circular motion
C
Equal to the instantaneous acceleration vector at the start of the motion
D
$A$ null vector

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The average acceleration vector for a particle having a uniform circular motion over one complete revolution is

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