Question
Molar specific heat at constant volume is ${C_v}$ for a monoatomic gas is
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$\left[\right.$ Take $\left.g =10\,m / s ^{2}\right]$


$(i)$ $m$ as system, along $Y'$
$(ii) $ $M$ as system, along $Y'$
$(iii)$ $(M + m)$ as system, along $X$
$(iv)$ $(M + m)$ as system, along $Y$
Which of the following is correct?