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A smooth block is released at rest on a ...

A smooth block is released at rest on a `45^@` incline and then slides a distance 'd'. The time taken to slide is 'n' times as much to slide on rough incline than on a smooth incline. The coefficient of friction is

A

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

B

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

C

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

D

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

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The correct Answer is:
A
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