1. The problem statement, all variables and given/known data https://1drv.ms/b/s!ApJAu5EMYb4JgpYy68UWlGVzp0PVLQ Problem 21 2. Relevant equations x1 = Aeiw0t + 3Be2iw0t x2 = 3Aeiw0t - Be2iw0t 3. The attempt at a solution At t = 0 both masses at equilibrium so the above equations simplify to: 0 = A + 3B 0 = 3A - B Thus B = -2A. Is this wrong. Why? Here's the teacher answer: https://1drv.ms/b/s!ApJAu5EMYb4JgpYov43i3LZIO3MQhA Why does he only work with velocity equations & not the displacement ones?