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Calculate the gravitational force on a body of mass 1 kg lying on the aurface of earth. Given mass of earth. Given mass of earth is `6xx10^(24)` kg and radius of earth is 6400 km.

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Here, `m_(1)=1kg, m_(2)=6xx10^(24)kg`
`d=6400 km =6.4xx10^(6)m, F = ?`
`F = (Gm_(1)m_(2))/(d^(2)) =(6.67 xx 10^(-11)xx1xx6 xx 10^(24))/((6.4 xx10^(6))^(2)) =9.8N`
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