Answer
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Step 1:: Understand the problem
We are asked to identify the units for the coefficients of static and kinetic friction.
Step 2:: Recall the definition of coefficients of friction
Coefficients of friction are dimensionless (unitless) quantities that describe the resistance to motion between two surfaces in contact.
Step 3:: State the units for coefficients of friction
The coefficient of static friction, often denoted by $\mu_s$, is a unitless quantity.
Similarly, the coefficient of kinetic friction, denoted by $\mu_k$, is also a unitless quantity.
Final Answer
Both the coefficient of static friction and the coefficient of kinetic friction are unitless.
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