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Two molecules of a gas have speeds of 9 ...

Two molecules of a gas have speeds of `9 xx 10^6` m s ^-1` and `1 x 10^6` m s ^-1`, respectively. What is the root mean square speed of these molecules.

A

15.05 kJ

B

19.59 kJ

C

2.55kJ

D

22.55kJ

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