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Question
The following statement is one of the laws of Dynamic friction
Options:
A .  The force of friction always acts in a direction opposite to that in which a body is moving
B .  The magnitude of the kinetic friction bears a constant ratio to the normal reaction between two surfaces. The ratio being slightly less than that in the case of limiting friction
C .  For moderate speeds the force of friction remains constant but decreases slightly with the increase of speed
D .  All the above
Answer: Option D
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