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Assuming earth to be a sphere of a uniform density, what is the value of gravitational acceleration in a mine 100 km below the earth’s surface (Given R = 6400 km)

(a)      9.66 m/s2                      (b)  7.64 m/s2

(c)   5.06m/s2                           (d) 3.10 m/s2

Answer: a

(5)

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