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Question

At what depth from the surface of the earth (in terms of the radius of earth) the acceleration due to gravity will be 2g5
(correct answer + 1, wrong answer - 0.25)

A
25R
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B
35R
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C
425R
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D
925R
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Solution

The correct option is B 35R
Gravity due to the earth at depth is g=g(1dR)
Where d = depth from the surface of the earth, R = radius of the earth,
Given that g=2g5
2g5=g(1dR)
25=[1dR]dR=125
dR=35

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