The time taken by an object to slide down $45^{\circ}$ rough inclined plane is $n$ times as it takes to slide down a perfectly smooth $45^{\circ}$ incline plane. The coefficient of kinetic friction between the object and the incline plane is
AIEEE 2005,JEE MAIN 2023,JEE MAIN 2018,AIIMS 2008, Diffcult
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