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Q)

Four particles have speed 2,3,4 and 5 cm/sec respectively. Their RMS speed is

$(a)\;3.5cm/S\qquad(b)\;(\large\frac{27}{2})cm/S\qquad(c)\;\sqrt{54} cm/S\qquad(d)\;\large\frac{\sqrt{54}}{2}cm/S$

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