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[" An elastic ball of mass "m" falls fro...

[" An elastic ball of mass "m" falls from a height "],[h" on an Aluminium disc of area A floating in "],[" a mercury pool.If the collision is perfectly "],[" elastic,the momentum transferred to the disc "],[" is- "],[[" (A) "sqrt(2mgh)," (B) "2sqrt(mgh)],[" (C) "m sqrt(2gh)," (D) "2m sqrt(2gh)]]

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