If µ_s , µ_k and µ_rare the coefficients of static, kinetic and rolling friction respectively then:

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µ_s = µ_k = µ_r

µ_s > µ_k > µ_r

µ_s> µ_k< µ_r

µ_s < µ_k > µ_r

answer is C.

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Detailed Solution

in case of static friction , the applied force alone has to break the cold welds. So f_s has the highest value. In case of kinetic friction , momentum of the body helps the applied force to break the cold welds. So f_s > f_k .

In case of rolling , no cold welds are formed.

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