Two particles start simultaneously from the same point and move along two straight lines, one with uniform velocity $v$ and other with a uniform acceleration $a$. If $\alpha$ is the angle between the lines of motion of two particles, then the least value of relative velocity will be at time given by

  • A

    $\frac{v}{a} \sin \alpha$

  • B

    $\frac{v}{a} \cos \alpha$

  • C

    $\frac{v}{a} \tan \alpha$

  • D

    $\frac{v}{a} \cot \alpha$

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