A glider w ith mass m = 0.20 kg sits on a frictionless horizontal air truck, connected to a spring w ith force constant K = 5.00 N/m. You pull on the glider, stretching the spring 0.100m, and then release it w ith no initial velocity. What is the displacement 'x'of the glider from its equilibrium position when its speed is 0.20 mis?