A particle is moving in a circle or radius \( r \) centred at \( O \) with constant speed \( v \...

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A particle is moving in a circle or radius \( r \) centred at \( O \) with constant speed \( v \). The change in velocity in moving from \( P \) to \( Q\left(\angle P O Q=40^{\circ}\right) \) is :
(A) \( 2 v \cos 40^{\circ} \)
(B) \( 2 v \sin 40^{\circ} \)
(C) \( 2 v \cos 20^{\circ} \)
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