A ball is projected horizontally from the top of a tower of height H with a velocity v_o. It will be moving at an angle of 60° with the horizontal after time

• A

  $\frac{{\mathrm{v}}_0}{\sqrt{3}\mathrm{g}}$

• B

  $\frac{\sqrt{3}{\mathrm{v}}_0}{\mathrm{g}}$

• C

  $\frac{{\mathrm{v}}_0}{\mathrm{g}}$

• D

  None of these