A particle moving on xy-plane is acted u...

A particle moving on xy-plane is acted upon by a force `vecF =-K(yhati+xhatj)` where K is a constant . Starting from the origin , the particle si brought to the point (a,0) along the positive x-axis and then to the point (a,a) parallel to y-axis. Work done by the force on the particle will be

`-2 Ka^2`

`2K a^2`

`-Ka^2`

`Ka^2`

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