Three particles have speeds of $2u$ , $10u$ and $11u$. Which of the following statements is correct?
  • AThe r.m.s. speed exceeds the mean speed by about $u.$
  • BThe mean speed exceeds the r.m.s. speed by about $u.$
  • C
    The r.m.s. speed equals the mean speed.
  • DThe r.m.s. speed exceedsthe mean speed by more than $2u$.
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