PhysicsMedium68×since 2002Q7548A smooth block is released at rest on a 45∘{45^ \circ }45∘ incline and then slides a distance ′d′'d'′d′. The time taken to slide is ′n′'n'′n′ times as much to slide on rough incline than on a smooth incline. The coefficient of friction isAμk=1−1n2{\mu _k} = \sqrt {1 - {1 \over {{n^2}}}}μk=1−n21Bμk=1−1n2{\mu _k} = 1 - {1 \over {{n^2}}}μk=1−n21Cμk=1−1n2{\mu _k} = \sqrt {1 - {1 \over {{n^2}}}}μk=1−n21Dμs=1−1n2{\mu _s} = 1 - {1 \over {{n^2}}}μs=1−n21Check answerSkip