A marble is allowed to roll down an inclined plane from a fixed height. At the foot of the inclined plane, it moves on a horizontal surface (a) covered with silk cloth (b) covered with a layer of sand and (c) covered with a glass sheet. On which surface will the marble move the shortest distance? Give reason for your answer.



On the surface covered with sand, it will cover the least distance because sand offers maximum friction against its motion.

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