1. The problem statement, all variables and given/known data This is a question from a test i had today..i wanna know if I did it right or not. A mass on a spring with spring constant 700 N/m is compressed 16 cm. If the maximum value of the speed is 12 m/s, what is the mass of the mass in kg? 2. Relevant equations Ep = 1/2kx^2, Ek = 1/2mv^2 3. The attempt at a solution so conservation of energy plays a role in this... Vmax = 12 m/s k = 700 N/m x = 0.16 m m = ? Ep = Ek 1/2kx^2 = 1/2mv^2 m = (1/2kx^2) / (1/2v^2) m = 0.12 kg. im really doubting myself right now.