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 
and coefficient of restitution of each collision is 'e', then the velocity of ball after its second collision at B is
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During 1 st collision perpendicular component of V, 
becomes e times, while II nd component 
remains unchanged and similarly for second collision. The end result is that both 
and 
becomes e times their initial value and hence V" = – eV (the ( – ) sign indicates the reversal of direction).
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