Which of the following is true about the coefficient of static friction $(\mu_s)$ and the coefficient of kinetic friction $(\mu_k)$?
- A$\mu_s$ is always equal to $\mu_k$
- B$\mu_s$ is always greater than $\mu_k$
- C$\mu_s$ is always less than $\mu_k$
- DDepending upon applications,$\mu_s$ can be greater,less,or equal to $\mu_k$
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