1. The problem statement, all variables and given/known data 2. Relevant equations E = 1/2mv^2 + 1/2kx^2 = 1/2kA^2 omega = Sqrt(k/m) f = omega/(2pi) = 1/(2pi)*Sqrt(k/m) 3. The attempt at a solution m = 150kg M = 150kg + 50kg = 200kg x = 15ft = 4.57m h1 = 3.04 m h_real = ? x = A? mgh = (1/2)Mv^2 + (1/2)kx^2 Since there is no velocity given, I use: mgh = (1/2)kA^2 I need to find k: 3 cycles every 10 seconds f = 0.3 cycles/s f = (1/2pi)Sqrt(k/M) 0.3 = (1/2pi)Sqrt(k/M) k = 710 N/m (150kg)(9.8m/s^2)(h) = (1/2)(710N/m)(4.57m)^2 h = 5.04m h_real > h1 Did I do that correctly?