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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

(a)     -2 Ka2                           (b)  2 Ka2

(c)    – Ka2                               (d) Ka2

Answer: C

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