A girl throws a ball with initial velocity \( v \) at an inclinatio...

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A girl throws a ball with initial velocity \( v \) at an inclination of \( 45^{\circ} \). The ball strikes the smooth vertical wall at a horizontal
\( \mathrm{P} \) distance \( d \) from girl and after rebounding returns to her hand.

W What is the co-efficient of restitution between wall and ball?
(A) \( v^{2}-g d \)
(B) \( \frac{g d}{v^{2}-g d} \)
(C) \( \frac{g d}{v^{2}} \)
(D) \( \frac{v^{2}}{g d} \)
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