The acceleration due to gravity at a height of 6400 km from the surface of the earth is 2.5 ms-2. The acceleration due to gravity at a height of 12800 km from the surface of the earth is (Radius of the earth = 6400 km)
1
1.11 ms-2
2
1.5 ms-2
3
2.22 ms-2
4
1.25 ms-2