Two thin roads are moving perpendicularl...

Two thin roads are moving perpendicularly as shown in the figure. If the friction acting between them is `F_(R )` then the unit vector in the direction of friction force acting on the rod lying along x-axis is

`((-hati-2hatj))/(sqrt(5))`

`((hati+2hatj))/(sqrt(5))`

`((3hati+2hatj))/(sqrt(13))`

none of these

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Unit vector along friction force acting on rod along `x-`axis is opposite to direction of velocity of rod along `x-` axis relative to other rod.

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