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A stone is thrown vertically upwards wit...

A stone is thrown vertically upwards with an initial speed `u` from the top of a tower, reaches the ground with a speed `3 u`. The height of the tower is :

A

`3h^(2)//g`

B

`4u^(2)//g`

C

`6u^(2)//g`

D

`9u^(2)//g`

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