A \(1-\mathrm{kg}\) standard cart collides with a \(5.0-\mathrm{kg}\) cart initially at rest on a low-friction track. After the collision, the standard cart is at rest and the \(5.0-\mathrm{kg}\) cart has a velocity of \(0.20 \mathrm{~m} / \mathrm{s}\) to the left. What was the initial velocity of the standard cart?