1. The problem statement, all variables and given/known data If a mass attached to a spring has motion given by the equation X(t) = 5(sin(3pi(t))), what is the equation for the acceleration of the spring? What is the angular speed of the spring,and what is its frequency and period? If the spring has a spring constant of 900 N/m, what is the mass attached at the end of the spring. Assume that the spring is constant, frictionless, and exhibits simple harmonic motion. 2. Relevant equations 3. The attempt at a solution I don't even know where to begin on this one. I looked through the slides and nowhere is there a formula for acceleration that doesn't require you to know the mass already. I feel like I'm either missing an equation or missing a variable here that is required to solve this problem. Thanks in advance!