Two balls of masses \(40 \mathrm{~g}\) and \(60 \mathrm{~g}\) respectively, are attached firmly to the ends of a light \(m\) rule. The centre of gravity of the system is ____________

A. at the mid-point of the metre rule
B. \(40 \mathrm{~cm}\) from the lighter mass
C. \(40 \mathrm{~cm}\) from the heavier mass  
D. \(60 \mathrm{~cm}\) from the heavier mass

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Correct Answer: C