A box of mass 8 kg placed on a rough in...

A box of mass `8 kg ` placed on a rough inclined plane of inclened `theta` its downward motion can be prevented by applying an upward pull `F` and it can be made to slide upward appliying a force `2F` .The coefficient of friction between the box and the inclined plane is

`1/3tantheta`

`3tantheta`

`1/2 tan theta`

`2 tan theta `

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