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How much below the surface of the earth does the acceleration due to gravity become 1percent of its value at the earth surface? The earth is assume to be a sphere of radius 6.4×10^6m.
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Ioba Bolwary Marak

Beneath the surface, gravity is basically a linear function of the radius. So, at 1/100 the radius, g is reduced by a factor of 1/100
See the discussion here:
http://physics.stackexchange.com/questions/99117/whygravitydecreasesaswegodownintotheearthposted by Steve
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