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Q.

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

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a

3.5cm/s

b

272 cm/s

c

54/2 cm/s

d

9/5 cm/s

answer is C.

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Detailed Solution

C=22+32+42+524=542 cm/s
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