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Doubt

how about negative value of friction

Answer Explanation

friction is a force so it may have any direction if it is in positive direction its value is positive and vice-versa. The work done by friction may be negative or positive. if body is actually displaced over another surface the work done by friction is negative. if friction helps to accelerate a body( as block on the surface of accelerating train accelerate with the train) the work done by friction is positive.

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