A ball is projected from a given point with velocity \( u \) at some angle with the horizontal a...

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A ball is projected from a given point with velocity \( u \) at some angle with the horizontal and atter hitting a vertical wall returns to the same point. Show that the distance of the point from the wall must be less than \( \frac{e u^{2}}{(1+e) g} \), where e is the coefficient of restitution.
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