Question: A sphere of mass 2kg moving with a velocity collides elastically with another sphere which is at rest. After collision, the first sphere moves

A sphere of mass 2kg moving with a velocity collides elastically with

A sphere of mass 2kg moving with a velocity collides elastically with another sphere which is at rest. After collision, the first sphere moves in the same direction with its velocity reduced to one third if its initial velocity. The mass of second sphere is (A) 2 kg (B) 3 kg (C) 1kg (D) 5 kg

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