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Statement$-1 :$ Internal energy of gas $U = nC_VT$ is due to random motion of gas molecules.
Statement$-2 :$ A container is moving with speed $v$. It is suddenly stopped by a force, temperature of gas increases.

• A
  Statement$-1$ is True, Statement$-2$ is True ; Statement$-2$ is a correct explanation for Statement$-1.$
• ✓
  Statement$-1$ is True, Statement$-2$ is True ;  Statement$-2$ is not a correct explanation for Statement$-1$.
• C
  Statement$-1$ is True, Statement$-2$ is False.
• D
  Statement$-1$ is False, Statement$-2$ is True.