Arrange the following in increasing order of surface roughness:

Sandpaper < Cardboard < Polished steel

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Polished steel < Cardboard < Sandpaper

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Polished steel < Sandpaper < Cardboard

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Cardboard < Sandpaper < Polished steel

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Solution

The correct option is B Polished steel < Cardboard < Sandpaper
Polished steel surface is the smoothest among the given surfaces because it has the least irregular surface followed by cardboard and sandpaper respectively. If we try to slide a block with same speed on all these surfaces, the block will move farthest on the polished steel surface because it offers the least friction.

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