A) \[{{\mu }_{s}}>{{\mu }_{k}}>{{\mu }_{r}}\]
B) \[{{\mu }_{s}}<{{\mu }_{k}}<{{\mu }_{r}}\]
C) \[{{\mu }_{s}}<{{\mu }_{k}}>{{\mu }_{r}}\]
D) \[{{\mu }_{s}}>{{\mu }_{r}}>{{\mu }_{k}}\]
Correct Answer: A
Solution :
Static friction is always greater than kinetic friction, and rolling friction is less than kinetic friction, so \[{{\mu }_{s}}>{{\mu }_{k}}>{{\mu }_{r}}\]
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