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 mean speed of the molecules will be

8.14

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70.8

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zero

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6.8

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Solution

The correct option is D zero
$v_{a v g} = \frac{v_{1} + v_{2} + v_{3} + v_{4} + v_{5}}{5} = \frac{- 10 + 15 + 2 - 3 - 4}{5} = \frac{0}{5} = 0$

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