The 15.0-kg double wheel with radius of gyration of 100 mm about O is connected to the spring of stiffness k = 460 N/m by a cord which is wrapped securely around the inner hub. If the wheel is released from rest on the incline with the spring stretched 310 mm, calculate the maximum velocity v_{max} of its center O during the ensuing motion​[ ​[m/s]. The wheel rolls without slipping.