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Derive the relation between accelaration...

Derive the relation between accelaration due to gravity at the surface of a planet and Gravitational constant.

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Relation beween g and G: Each and everybody was attracted towards centre of earth with some force. This is called weight of the body, `W=mg"………."(1)`
This force is due to gravitational pull on the body by the earth.
For small distance above earth from centre of earth is equal to radius of earth 'R'.
According to Newton's Law of gravitation.
.
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