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

A smooth block is released at rest on a `45^@` incline an dthen 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 :

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

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

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

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

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