Q 1453380244.     A stone is thrown vertically upward with an initial
speed u from the top of a tower. It reaches the ground
with a speed `3u`. The height of the tower is

A

`3u^2 //g`

B

`4u^2 //g`

C

`6u^2 //g`

D

`9u^2 //g`

HINT

`(3u)^2 =u^2 +2gh`
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