1. The problem statement, all variables and given/known data Lets say I have a spring, resting at a length x at t = 0 seconds, with a spring constant k, and at the end is attached with a block with mass m. I give the block a velocity v in the -x direction. Now I'm asked to find the Amplitude. 2. Relevant equations 3. The attempt at a solution Here, I'm thinking, KEmax = PEmax = 1/2 m v2 = 1/2 k A2 since the highest velocity is the initial 'push' i give it, is it safe to say I have every variable to solve for A(amplitude)?