$A$ thermally insulated vessel contains an ideal gas of molecular mass $M$ and ratio of specific heats $\gamma$. It is moving with speed $v$ and is suddenly brought to rest. Assuming no heat is lost to the surroundings,its temperature increases by
- A$\frac{\gamma M v^2}{2R}$
- B$\frac{(\gamma - 1)}{2R} M v^2$
- C$\frac{(\gamma - 1)}{2(\gamma + 1)R} M v^2$
- D$\frac{(\gamma - 1)}{2\gamma R} M v^2$
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