1. The problem statement, all variables and given/known data A spring is attached to a ceiling with a distance of 20 meters from the ground to the tip of the spring. The spring is brought down 5 meters down (This means 15 meters from the ground) and then released. The spring loses 5% of its energy each second. Assume a period of pi. Determine an equation to model the distance from ground in terms of time. 2. Relevant equations Trig function that exponentially gets smaller amplitude. I'm guessing the period would get shorter. 3. The attempt at a solution My guess is f(x) = .95^(x)(-5cos(pi(1.05^x))) + 16 Can someone verify/correct me.