If two masses \(40 g\) and \(60 g\) respectively, are attached firmly to the end of a light metre rule, what is the centre of gravity of the system?
A. At the mid point of the metre rule B. \(40 cm\) from the lighter mass C. \(40 cm\) from the heavier masses D. \(60 cm\) from the heavier mass E. Indeterminate because the metre rules is light
Correct Answer: C
Explanation
We take and equate \(40 x=60(100-x)\) \(40 x=60(100-x)\) \(40 x=6000-60 x\) \(40 x=6000\) \(x=60\) Hence, it will be \(40 cm (100-60) cm\) from the heavier mass
