$A$ helicopter flying horizontally with a speed of $360 \ km/h$ at an altitude of $2 \ km$,drops an object at an instant. The object hits the ground at a point $O$,$20 \ s$ after it is dropped. The displacement of $O$ from the position of the helicopter where the object was released is: (use acceleration due to gravity $g = 10 \ m/s^2$ and neglect air resistance)

  • A
    $2\sqrt{5} \ km$
  • B
    $4 \ km$
  • C
    $7.2 \ km$
  • D
    $2\sqrt{2} \ km$

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