A small block of mass m is kept on a rou...

A small block of mass m is kept on a rough inclined surface of inclination `theta` fixed in a car. The car moves with a uniform velocity v and the block does not slide on the wedge. The work done by the force of friction on the block in time t will be

`- mgvt sin theta`

`- (mgvt sin 2theta)/2`

`- mgvt cos theta`

`- (mgvt cos 2theta)/2`

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