The formula -G Mm(1/r2-1/r1) is more accurate than the formula mg(r2-r1) for difference of potential energy between two points r2 and r1 distance away from the centre of earth why?

Dear student
the formula mg(r2-r1) is only applicable when distance r2 and r1 is very less than radius of Earth and r2 are r1 are near to surface .But formula -GMm(1/r2-1/r1) is applicable in any case and more accurate value than other one .
Regards

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