The escape velocity of a body projected vertically upwards from the earth's surface is 11.2 km/sec. If the body is projected in a direction making 30° angle to the vertical, its escape velocity in this case will be :

• A

  11.2 km/s

• B

  11.2 x (1/2)km/s

• C

  $11.2(\sqrt{3}/2)\mathrm{km}/\mathrm{s}$

• D

  11.2 x (1/3) km/s