A small ball is projected from point \( P \) towards a vertical wall as shown in figure. It hits...

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A small ball is projected from point \( P \) towards a vertical wall as shown in figure. It hits the wall when its velocity is horizontal. Ball reaches point \( P \) after one bounce on the floor. The coefficient of restitution assuming it to be same for two collisions is \( n / 2 \). All surfaces are smooth. Find the value of \( n \).
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