At what height above the earth's surface...

At what height above the earth's surface, the value of g is same as in mine 80 km deep?

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At what height above the earth's surface, the value of g is same as that at a depth of 100 km ?

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SL ARORA-FLUIDS AT REST-Problem for self practice

At what height above the earth's surface, the value of g is same as in...
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