A particle follows circular motion with constant speed, then

\to a

of particle must be zero.

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\to a

must be parallel to velocity.

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\to a

must be perpendicular to velocity.

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{\to a}_{a v g}

in half cycle (semicircle) must be zero.

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Solution

The correct option is C $\to a$ must be perpendicular to velocity.
In uniform circular motion, acceleration is towards the centre of rotation. So, it is perpendicular to velocity.

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