MCQ
At what temperature the kinetic energy of gas molecule is half of the value at $27^\circ C\ ?$
- A$13.5^\circ C$
- B$150^\circ C$
- C$75K$
- ✓$-123^\circ C$
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$(A)$ 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 $4 \mathrm{~J}$
