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[" Four particles have speed "2,3,4" and...

[" Four particles have speed "2,3,4" and "5],[" cm/s respectively.Their rms speed is "],[[" (A) "3.5cm/s," b) "],[" (B) ",(27/2)cm/s],[" (C) ",sqrt(54)cm/s],[" (D) "sqrt(54)/2cm/s]]

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