An elastic band is hung on a hook and a mass is hung on the lower end of the band. When the mass is pulled downward and then released, it vibrates vertically. The equation of motion is s = 2 cos(t) + 9 sin(t), t ≥ 0, where s is measured in centimeters and t in seconds. (Take the positive direction to be downward.)
I've found the velocity by taking the derivative of s. --> -2sin(t)+9cos(t).
How do I use it to solve the following: How far from its equilibrium position does the mass travel?