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## Main Question or Discussion Point

Is the height in the formula the vertical distance from the bottom to the center of gravity of object, or is it just the vertical distance from the bottom to the very top of the object.

I mean..

If there is a sphere with mass m and radius r and placed at height h, what is its potential gravitational energy ?

Is it just mgh or mg(h-r) ?

I mean..

If there is a sphere with mass m and radius r and placed at height h, what is its potential gravitational energy ?

Is it just mgh or mg(h-r) ?