Work Power And Energy

A car accelerates from rest to \(u \mathrm{~m} / \mathrm{s}\). The energy spent in this process is E J. The energy required to accelerate the car from \(u \mathrm{~m} / \mathrm{s}\) to \(2 \mathrm{u} \mathrm{m} / \mathrm{s}\) is \(\mathrm{nE~J}\). The value of \(\mathrm{n}\) is ____________.