A body takes time t to reach the bottom ...

A body takes time `t` to reach the bottom of a smooth inclined plane of angle `theta` with the horizontal. If the plane is made rough, time taken now is `2t`.The coefficient of friction of the rough surface is

`(3)/(4)tan theta`

`(2)/(3)tan theta`

`(1)/(4)tan theta`

`(1)/(2)tan theta`

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