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A stone is thrown vertically upward with...

A stone is thrown vertically upward with an initial velocity u from the top of a tower, reaches the ground with a velocity 3u. The height of the tower is

A

`(3u^2)g`

B

`(4u^2)/g`

C

`(6u^2)/g`

D

`(9u^2)/g`

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The correct Answer is:
B
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