A small ball strikes at one end of a stationary uniform frictionless rod of mass m andlength I which is free to rotate, in gravity-free space. The impact is elastic. Instantaneous axis of rotation of the rod will pass through(A) its center of mass.(B) the center of mass of rod plus ball.(C) the point of impact of the ball on the rod.(D) the point which is at a distance 2l/3 from the striking end.

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