Hi there, SalsaOnMyTaco here again. 1. The problem statement, all variables and given/known data A 44 gram mass is attached to a massless spring and allowed to oscillate around an equilibrium according to: y(t) = 1.2*sin( 3.1415*t ) where y is measured in meters and t in seconds -What is the spring constant in N/m ? HELP: Simple harmonic motion with the amplitude A is equivalent to the motion on a circle with the radius A, and the same angular frequency omega. The force acting on an object with the mass m moving on a circle with the radius A with the angular frequency ω is F_circ=m*A*ω2. The force exerted by a spring with the constant k is equal to F(x)=k*x, where x is the displacement. Due to the analogy mentioned above, the two forces are equal at the point of maximum displacement (amplitude), that is, F_circ=F(A). You can solve this equation for omega in terms of k and m. 2. Relevant equations T=2∏√(m/k) 3. The attempt at a solution I have no idea how to approach this problem. Should I start from figuring out the Period to then solve for K on the above equation?