A monoatomic gas of mass $4.0\, u$ is kept in an insulated container. Container is moving with velocity $30 \,m / s$. If container is suddenly stopped then change in temperature of the gas $\left( R =\right.$ gas constant) is $\frac{ x }{3 R } .$ Value of $x$ is ..........
JEE MAIN 2021, Diffcult
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