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23. The value of g at the surface of earth is9.8 m/s2. Then the value of 'g' at a place 480 kmabove the surface of the earth will be nearly (radiusof the earth is 6400 km)(1) 9.8 m/s2(3) 8.5 m/s2(2) 7.2 m/s2(4) 4.2 m/s2

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