# How does U = mgh when h is smaller then r?

Why does the potential energy; U, equal mgh when h is smaller then r?

use equation

F = GmM/r^2 which then leads to,

F = -GmM/r

.... Why do we say that U = mgh when h<<r?

please explain with math!!

use equation

F = GmM/r^2 which then leads to,

F = -GmM/r

.... Why do we say that U = mgh when h<<r?

please explain with math!!

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