# Collision + observation

A particle of mass $$m$$ strikes with a rod of mass $$m$$ at its one of end as shown in diagram with $$e = 0$$, without sticking to the rod. If we observe the rod and particle from the point $$A$$ on the rod, then:

$$(A)$$ Angular momentum of rod and particle will be conserved just before and just after collision.

$$(B)$$ Linear momentum of rod and particle will be conserved.

$$(C)$$ Observed motion of rod after collision will be pure rotation.

$$(D)$$ Observed motion of particle will be straight line after collision.

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