A molecule in a gas container hits a horizontal wall with speed \( 200 \mathrm{~ms}^{-1} \) and ...

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A molecule in a gas container hits a horizontal wall with speed \( 200 \mathrm{~ms}^{-1} \) and angle \( 30^{\circ} \) with the normal and rebounds with the same speed. Which of the following statement(s) is/are correct?
(a) Momentum is not conserved.
(b) Elastic collision occurs here.
(c) Inelastic collision occurs here.
(d) Both (a) and (b)
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