The value of g at a depth of x metres from the surface of the Earth is calculated from the formula:

A. ga = 𝐺𝑀a/(𝑅a−𝑥)
B. ga = 𝐺𝑀a/(𝑅a−𝑥)2
C. ga = 𝐺𝑀a/(𝑥 −𝑅a)
D. ga = 𝐺𝑀a/(𝑅a−𝑥)2

D. ga = 𝐺𝑀a/(𝑅a−𝑥)2

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