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The block of mass m initially at x=0 is ...

The block of mass `m` initially at `x=0` is acted upon by a horizontal force at any position `x` is given as `F =a-bx^(2)(` where `a gt mu mg)`, as shown in the figure. The co`-` efficient of friction between the surface of contact is `mu`. The net work done on the block is zero, if the block travels a distance of `......................`

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