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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`=` 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/k sintheta`. The value of n is

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