A smooth block is released at rest on a ${45^ \circ }$ incline and then 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 \over {{n^2}}}} $
${\mu _k} = 1 - {1 \over {{n^2}}}$
${\mu _k} = \sqrt {1 - {1 \over {{n^2}}}} $
${\mu _s} = 1 - {1 \over {{n^2}}}$
Solution
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