A particle of mass 10 g is kept on surface of a uniform sphere of mass 100 kg and radius 10 cm. Find the work done against gravitational force between them, to take the particle for away from sphere $(G=6.67 \times 10^{-11} Nm^2/kg)$

Question

$$(a)\;3.33 \times 10^{-10} \;J \quad (b)\;13.34 \times 10^{-10}\;J \quad (c)\; 6.67 \times 10^{-9}\;J \quad (d)\;6.67 \times 10^{-10}\;J$$

Comments

But our given answer is c