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A block takes n times as much time to sl...

A block takes n times as much time to slide down a rough incline of `45^(@)` as it takes to slide down a perfectly smooth `45^(@)` incline. Coefficient of kinetic friction is :

A

`1-(1)/(n^(2))`

B

`(1)/(1-n^(2))`

C

`(1)/(sqrt(1-n^(2)))`

D

`sqrt(1-(1)/(n^(2)))`

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MODERN PUBLICATION-UNIT TEST PAPER NO.2 -MCQ
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