Question
According to the Rutherford’s atomic model, the electrons inside the atom are
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$I$.Readings in $A$ and $V_2$ are always in phase
$II$.Reading in $V_1$ is ahead in phase with reading in $V_2$
$III$.Readings in $A$ and $V_1$ are always in phase which of these statements are/is correct

$(A)$ Total momentum of the system is $3 \mathrm{~kg} \mathrm{~ms}^{-1}$
$(B)$ Momentum of $5 \mathrm{~kg}$ mass after collision is $4 \mathrm{~kg} \mathrm{~ms}^{-1}$
$(C)$ Kinetic energy of the centre of mass is $0.75 \mathrm{~J}$
$(D)$ Total kinetic energy of the system is $4 \mathrm{~J}$