A disk with a mass M, a radius R, and a rotational inertia of I= MR^2 is attached to a horizontal spring which has a spring constant of k. When the spring is stretched by a distance x and then released from rest, the disk rolls without slipping while the spring is attached to the frictionless axle within the center of the disk. Calculate the maximum translational velocity of the disk in terms of M,R, x, k.​