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The formula –G Mm(1//r(2) – 1//r(1)) is...

The formula –G Mm`(1//r_(2) – 1//r_(1))` is more/less accurate than the formula mg ` (r_(2) – r_(1))` for the difference of potential energy between two points `r_(2) and r_(1)` distance away from the centre of the earth.

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