A smooth block is released at rest on a `45^(@)` inclined and then slides a distance d. the time taken to slide is n times as much to slide on rough incline then on a smooth incline of same inclination. The coefficient of friction fo rough incline.
A. `mu = (1-(1)/(n^(2)))`
B. `mu = sqrt (1-(1)/(n^(2)))`
C. `mu = sqrt((2)/(n^(2))-1)`
D. `mu=((2)/(n^(2))-1)`