A ball is thrown vertically downwards with velocity `sqrt(2gh)` from a height h. After colliding with the ground it just reaches

A ball is thrown vertically downwards with velocity `sqrt(2gh)` from a height h. After colliding with the ground it just reaches the starting point. Coefficient of restitution is :
A. `(1)/(sqrt(2))`
B. `(1)/(2)`
C. 1
D. `sqrt(2)`

A ball is thrown vertically downwards with velocity `sqrt(2gh)` from a height h. After colliding with the ground it just reaches the starting point. C

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