Two bodies having the same mass 5kg each have different surface areas 20m² and 10m² in contact with a horizontal plane. If the coefficient of friction is 0.4, the forces of friction that come into play when they are in motion will be in the ratio

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1:1

2:1

1:2

1:4

answer is A.

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Detailed Solution

Since the bodies have the same mass, normal reaction of the surface on the bodies are the same. Since kinetic friction does not depend upon the apparent area and is proportional to the normal reaction, option (1) is correct.

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