At what height from the surface of earth...

At what height from the surface of earth, the gravitation potential and the value of `g` are `-5.4 xx 10^(7) "J kg"^(-2) and 6 " ms"^(-2)` respecitvely ? Take, the radius of earth is 6400 km.

2000 km

2600 km

1600 km

1400 km

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