Deriving Gravitational Potential Energy (w/Calculus)

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Dr. Davies derives the general form of the gravitational potential energy using Newton's Universal Law of Gravitation. He also explain the "Flat Earth" approximation for determining the form of the potential energy used in the first semester of class.
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Can't see a Damn thing even though i'am playing at 480p

treeandplant
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hey quick question about the step at 9:25? Just not sure how you expanded it out that way? I assumed that y << Re thus y/Re could be approximated as 0. Thanks in advance!

LasNomadas
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Very last equation, Re^2 where it represents "g".

DrRpper
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I believe it is (G*Mearth)/Rearth^2 = g

forithall