A projectile of mass m is thrown with a velocity v making an angle \[60{}^\circ \] with the horizontal. Neglecting air resistance, the change in velocity from the departure A to its arrival at B, along the vertical direction is

• A. 2v                    
• B.        \[\sqrt{3}\text{v}\]
• C. v                     
• D.        \[\frac{\text{v}}{\sqrt{3}}\]