An object attached to a horizontal spring is oscillating back and forth along a frictionless surface. The maximum speed of the object is $1.25 \mathrm{m} / \mathrm{s},$ and its maximum acceleration is 6.89 $\mathrm{m} / \mathrm{s}^{2}$ . How much time elapses between an instant when the object's speed is at a maximum and the next instant when its acceleration is at a maximum?