1. The problem statement, all variables and given/known data Consider the following macroscopic oscillator: Two masses of equal mass are attached to a spring and oscillate with amplitude A at frequency v. Use classical physics to calculate the energy of the oscillator. 2. Relevant equations 3. The attempt at a solution This question doesn't say much about where the mass is attached or what environment this oscillator is in so I assumed that we're in a friction-less environment and the mass is attached on either end of the spring. Please tell me if that is incorrect. Based on that assumption, I know that the position of one of the mass would travel in a cosine curve. So we have p(t)=A*cos(2*pi*v*x). I can take the derivative of this to get the velocity v(t)=-2*pi*A*v*sin(2*pi*v*x). The maximum velocity is when t=1/(4v). Let's call this new velocity V. Now the energy of the spring should be 2*((1/2)*m*V^2). Is this correct? Or is there another way to do it. Thanks in advance!