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By using , we can calculate the gravitational attraction as if the solid sphere were a point mass, with all the mass concentrated at the center of the sphere.

$F = frac{GMm}{R^2}$

$= frac{(6.67xx10^{-11} "Nm"^2"kg"^{-2})(4.0xx10^4 "kg")(1.0 "kg")}{(3.00 "m")^2}$

$ = 2.96xx10^{-7} "N"$