Question: Two steel spheres approach each other head on with same speed and collide elastically. After the collision one of the sphere's radius 'r' comes

Two steel spheres approach each other head on with same speed and

Two steel spheres approach each other head on with same speed and collide elastically. After the collision one of the sphere's radius 'r' comes to rest. The radius of the other sphere is (A) 31/a (B) (C) 9 (D) 3ir

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