AB is an L shaped obstacle fixed on a horizontal smooth table. A ball strikes it at A, gets deflected and restrikes it at B. If the velocity vector before collision is v and coefficient restitution of each collision is 'e'. Then the velocity of ball after its second collision at B is


(A) e 2 v               (B) - e 2 v                 (C) - e v                    (D) data insufficient

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