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If coefficient of static friction is mu(...

If coefficient of static friction is `mu_(s)` and coefficient of kinetic friction is `mu_(k)` , which one is correct ?

A

there is no problem between `mu_s` and `mu_k`

B

generally `mu_s gt mu_k`

C

generally, `mu_s=mu_k`

D

generally `mu_s lt mu_k`

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