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 $\left(\mathrm{\angle }POQ={40}^{\circ }\right)$

• A

  $2v\cos {40}^{\circ }$

• B

  $2v\sin {40}^{\circ }$

• C

  $2v\sin {20}^{\circ }$

• D

  $2v\cos {20}^{\circ }$