The gravitational potential at a point a...

The gravitational potential at a point above the surface of earth is `-5.12times10^(7)J//kg` and the acceleration due to gravity at that point is `6.4m//s^(2)` .Assume that the mean radius of earth to be 6400km" .The height of this point above the earth's surface is :

540 km

1200 km

1000 km

1600 km

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