If root mean square speed of \( 8 \mathrm{~g} \) of He is \( 300 \mathrm{~m} \mathrm{~s}^{-1} \)...

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If root mean square speed of \( 8 \mathrm{~g} \) of He is \( 300 \mathrm{~m} \mathrm{~s}^{-1} \), then total kinetic energy of He gas is
(A) \( 120 \mathrm{~J} \)
(B) \( 140 \mathrm{~J} \)
(C) \( 360 \mathrm{~J} \)
(D) \( 90 \mathrm{~J} \)
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