At t = 0, the platen described in Problem 21.89 is 0.1 m to the right of its equilibrium p...

At t = 0, the platen described in Problem 21.89 is 0.1 m to the right of its equilibrium position and is moving to the right at 2 m/s. Determine the platen’s position relative to its equilibrium position as a function of time.