a) O A stick of mass M and legth L has a linear mass density (x) = 3Mx/L. See figure. Where is the center of mass Xem of the stick on the x-axis? A) x = L/2 B) x = L/4 C) x = 2L/3 D) x = 3L/4 n D B A Bos brak y x=0 M x = L