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
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

(1) d = 1 km

(2) 3/2 km

(3) d = 2 km

(4) 1/2 km

Solution: Answer (3)

Above earth surface       below Earth surface