Basic Doubt from collision

Q 2 I have basic doubt in it please elaborate your working

B is the answer??


May be it's very basic but i want to know how you break those components there is no angle given?

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Elaborated as you asked.


Thanks @Samarth_2020 for your precious time.

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Option D??

Why not C?

Yes c is only possible
Even if elastic collision occurs it cannot return.

Yes I didn't read 'cannot return'

Well, given answer is A
That's the main point it doesn't mentions type of collision

Yes it is possible when the collision is elastic.