Work Power And Energy

An object of mass 'm' initially at rest on a smooth horizontal plane starts moving under the action of force F = 2N. In the process of its linear motion, the angle \(\theta\) (as shown in figure) between the direction of force and horizontal varies as \(\theta=\mathrm{k}x\), where k is a constant and \(x\) is the distance covered by the object from its initial position. The expression of kinetic energy of the object will be \(E = {n \over k}\sin \theta\). The value of n is ___________.