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Q.

On which horizontal surface, will the marble move the shortest distance if it is allowed to roll down on an inclined plane from a fixed height. At the foot of the inclined plane, it moves on a horizontal surface?

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a

Covered with a silk cloth

b

Covered with a layer of sand

c

Covered with a glass sheet

d

Covered with oil

answer is B.

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Detailed Solution

The marbles will move the shortest distance when the surface is covered with a layer of sand.
The force of friction generated between the surfaces of marble and the layer of sand is greater than the friction between marble and silk and also greater than the friction between marble and glass sheet. This is because the marble moves the shortest distance on the horizontal surface covered with a layer of sand.

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