A block of mass m takes time t to slide down on a smooth inclined plane of angle of inclination θ and height h .If same block slids down on a rough inclined plane of same angle of inclination and same height and takes time n times of initial value,then coefficient frictiin between block and inclined plane is -(1+n^2) †anθ -(1-1/n^2)†anθ -(1-n^2)†anθ -(1+1/n2)ta -

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