1. The problem statement, all variables and given/known data "Alley club-ax consists of a symmetrical 8 kg stone that is 18cm long, and is attached to the end of a uniform 2.5 kg stick that is 98 cm long." 2. Relevant equations cm = centre of mass x(cm) = x1m1 + m2x2 / (m1+m2) 3. The attempt at a solution m1=8 m2=2.5 x1=9 x2=40 This seems like a very straightforward question, but I can't seem to get it right... the answer is 77.3cm from the handle's end, and I keep on getting 18.52cm which is WAY off!