A ship is moored at a dock in rough seas and frequently impacts the dock. The maximum velocity change caused by the impact is \(15 \mathrm{~m} / \mathrm{s}\). Design an isolator to protect a sensitive \(80-\mathrm{kg}\) navigational control system such that its maximum acceleration is \(30 \mathrm{~m} / \mathrm{s}^{2}\).