A \(0.530-\mathrm{kg}\) cart moving at \(0.922 \mathrm{~m} / \mathrm{s}\) to the right collides elastically with a \(0.25-\mathrm{kg}\) cart initially at rest. The \(0.25-\mathrm{kg}\) cart then moves off rapidly and compresses a spring before the \(0.530-\mathrm{kg}\) cart can catch it again. At the instant the \(0.25-\mathrm{kg}\) cart comes to rest, what is the energy stored in the spring?