# At what height from the surface of earth the gravitation potential and the value

At what height from the surface of earth the gravitation potential and the value of g are -5.4 x 10^{7} J kg ^{-2} and 6.0 ms^{-2} respectively? Take the radius of earth as 6400 km:

(a) 2000 km

(b) 2600 km

(c) 1600 km

(d) 1400 km