A body of mass m is projected horizontally with a velocity v from the top of a tower of height h and it reaches the ground at a distance x from the foot of the tower. If a second body of mass 2 m is projected horizontally from the top of a tower of height 2 h, it reaches the ground at a distance 2x from the foot of the tower. The horizontal velocity of the second body is

• A

  v

• B

  2v

• C

  $\sqrt{2}\mathrm{v}$

• D

  $\mathrm{v}/2$