1. The problem statement, all variables and given/known data A rod of length 24.5 cm has linear density (mass-per-length) given by the following equation, where x is the distance from one end. λ = 50.0 g/m + 20.5x g/m2 (a) What is its mass? (b) How far from the x = 0 end is its center of mass? 2. Relevant equations A. lambda=50.0 g/m +20.5x g/m2 3. The attempt at a solution I have been having a tough time trying to figure out part A. I am pretty lost, at first i thought you could put in .245 into the equation of the linear density to find the density and then multiply that by .245 but i am positive that this is wrong. I am not really good with the definition of center of mass Xcm=1/M Sigma(i) mixi if someone could also explain that it would be much appreciated.