question_answer

If \[{{\mu }_{s}},\,{{\mu }_{k}}\] and \[{{\mu }_{r}}\] are coefficients of static friction, sliding friction and rolling friction, then                  [EAMCET (Engg.) 1995]

A)                         \[{{\mu }_{s}}<{{\mu }_{k}}<{{\mu }_{r}}\]                 

B)                         \[{{\mu }_{k}}<{{\mu }_{r}}<{{\mu }_{s}}\]            

C)             \[{{\mu }_{r}}<{{\mu }_{k}}<{{\mu }_{s}}\]

D)               \[{{\mu }_{r}}={{\mu }_{k}}={{\mu }_{s}}\]