An experiment is conducted with a block of mass \(0.50\text{ kg}\) attached to an ideal horizontal spring. The block oscillates in simple harmonic motion on a frictionless horizontal surface. A motion sensor records the velocity \(v\) and position \(x\) of the block relative to its equilibrium position (\(x = 0\)), producing the elliptical graph shown. Based on the graph, what is the magnitude of the maximum acceleration of the block?