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At what distance from the centre of earth, the value of acceleration due to gravity

At what distance from the centre of earth, the value of acceleration due to gravity will be half that on the surface (R=radius of earth)

Options

(a) 2 R
(b) R
(c) 1.414 R
(d) 0.414 R

Correct Answer:

0.414 R

Explanation:

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