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A force F=K(yi+xj) (where K is a positive constant) acts on a particle moving in the xy-plane. Starting from the origin, the particle is taken along the positive x-axis to the point (a, 0) and then parallel to the y-axis to the point (a, a). The total work done by the force F on the particles is 

(1) 2Ka2

(2) 2Ka2

(3) Ka2

(4) Ka2