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A given object takes 3 times as much tim...

A given object takes 3 times as much time to slide downa `45°` rough incline as it takes to slide down a perfectly smooth `45°` incline. The coefficient of friction between the object and the incline is :

A

`1//8`

B

`8//9`

C

`1//2sqrt(2)`

D

`2sqrt(2)//3`

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The correct Answer is:
B
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