The velocities of five molecules of a gas are -10 m/s, 15 m/s, 2m/s, -3 m/s and -4 m/s respectively. the root mean square velocity of molecules will be ____ (in m/s)
A
8.41
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B
70.8
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C
Zero
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D
6.8
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Solution
The correct option is B 8.41 v2rms=v21+v22+v23+v24+v255=(−10)2+152+22+(−3)2+(−4)25=70.8m2/s2 ⇒vrms=√70.8=8.41m/s