If ${\mu _s},\,{\mu _k}$ and ${\mu _r}$ are coefficients of static friction, sliding friction and rolling friction, then
If ${\mu _s},\,{\mu _k}$ and ${\mu _r}$ are coefficients of static friction, sliding friction and rolling friction, then
- A
${\mu _s} < {\mu _k} < {\mu _r}$
- B
${\mu _k} < {\mu _r} < {\mu _s}$
- C
${\mu _r} < {\mu _k} < {\mu _s}$
- D
${\mu _r} = {\mu _k} = {\mu _s}$
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