A projectile A is thrown at an angle 30° to the horizontal from point P. At the same time, another projectile B is thrown with velocity $\nu$₂ upwards from the point Q vertically below the highest point A would reach. For B to collide with A, the ratio   $\frac{v_2}{v_1}$ should be

• A

  $\frac{\sqrt{3}}{2}$

• B

  2

• C

  $\frac{1}{2}$

• D

  $\frac{2}{\sqrt{3}}$