The acceleration due to gravity at a height 1 km above the earth is the same as at a depth d below the surface of earth. Then

• A

  d = km

• B

  $\mathrm{d}=\frac{3}{2}\mathrm{km}$

• C

  d = 2km

• D

  $\mathrm{d}=\frac{1}{2}\mathrm{km}$