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A girl throws a ball with an initial vel...

A girl throws a ball with an initial velocity v at an angle `45^@`. The ball strikes a smooth vertical wall at a horizontal distance d from the girl and after rebound returns to her hands. What is the coefficient of restitution between wall and ball ? `(v^2 gt dg)`

A

`v^(2)-gd`

B

`(gd)/(v^(2)-gd)`

C

`(gd)/(v^(2)`

D

`v^(2)/(gd)`

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