The dimensional formula for $r.m.s.$ (root mean square) velocity is

  • A
    ${M^0}L{T^{ - 1}}$
  • B
    ${M^0}{L^0}{T^{ - 2}}$
  • C
    ${M^0}{L^0}{T^{ - 1}}$
  • D
    $ML{T^{ - 3}}$

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