Kinetic Energy Varying Force

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 θ (as shown in figure) between the direction of force and horizontal varies as θ=kx, 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∕ksin‌θ. The value of n is _______.