A particle is moving on a circular path of radius \( r \) with uniform velocity \( v \). The cha...

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A particle is moving on a circular path of radius \( r \) with uniform velocity \( v \). The change in velocity when the particle moves from \( P \) to \( Q \) is \( \left(\angle P O Q=40^{\circ}\right) \)
(a) \( 2 v \cos 40^{\circ} \)
(b) \( 2 v \sin 40^{\circ} \)
(c) \( 2 v \sin 20^{\circ} \)
(d) \( 2 v \cos 20^{\circ} \)
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