1. The problem statement, all variables and given/known data Regarding part (c) (i), as we know that we can consider any of the convenient point as our pivot. If I consider the point where the 5kg mass (center of mass of the bag) acts, the asnwer turns out to be wrong. The correct answer has 4kg mass as pivot 2. Relevant equations 14(0.5x)=m(0.5x)+4(0.5x) m=mass to be found x=distance from the 5kg mass I have considered as pivot 3. The attempt at a solution According to the equation above, x cancels out and we should get m=10kg, but the answer is 4+5(1/2)=16.5kg. Kindly explain why my approach is wrong and why can't we take the center of mass of the bag as our pivot?