A molecule in a gas container hits a horizontal wall with speed 200 ms-1 and angle 30° with the normal and rebounds with same speed. Is momentum conserved in the collision? Is the collision elastic or inelastic?

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as the linear momentum is always conserved unless an external force applied on body. i.e. Fext =0 and acording to question the molecule rebound on wall so that intial kinetic energy and final kinetic energy will same i.e. KEi=KEf as the momentum is conserved then collision is elastic.
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