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# Edexcel A Level Physics - G fields - Derivation of v= -Gm/r watch

1. Hi my teacher is telling us to derive:

potential energy, v= -Gm/r from:

Gravitational potential energy (GPE) = -Gmm/r and work= gpe/mass

Do we even need to know this???... it doesn't say it in the spec, she just confuses the class.
2. (Original post by LORD_LFC_5)
Hi my teacher is telling us to derive:

potential energy, v= -Gm/r from:

Gravitational potential energy (GPE) = -Gmm/r and work= gpe/mass

Do we even need to know this???... it doesn't say it in the spec, she just confuses the class.
V = -GM/r is gravitational potential NOT gravitational potential energy.

To derive gravitational potential, you can do it from fundamental that is using calculus or from the definition of gpe -GMm/r and divide gpe by mass.

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