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The gravitational potential at a point above the surface of earth is – 5.12 × 10 7 J/kg and the acceleration due to gravity at that point is 6.4 m/s 2 . Assume that the mean radius of earth to be 6400 km. The height of this point above the earth’s surface is:

1. 540 km
2. 1200 km
3. 1600 km
4. 1000 km

Correct answer: 1600 km

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