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If the same wedge is made rough then the time taken by body to come down becomes n times more (nt)

Then find the Coefficient of Friction between body and wedge in term of n?
Answers (1)
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For the below figure

        

The distance S is the same.

And using this concept we get 

\mu=tan\theta\left[1-\frac{1}{n^{2}} \right ]

Where 

\mu=coefficient of friction

\theta= Angle of inclination

n = an integer

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