Here's my question: say a car with x kinetic energy crashes into a spring so that the elastic potential energy becomes x. During the process, the spring compresses a distance of 9.13 meters. How do I find the time it takes for the spring to compress that distance (what information will I need?). The frequency is the number of oscillations per second, and the period is the number of seconds in one oscillation. So... in my head... it feels like the time would be 1/4 the period - because that would give the time the mass reached the highest amplitude. Is this right? There's also something called angular frequency.. but I have no idea what that is.