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A ball is thrown vertically upward with ...

A ball is thrown vertically upward with a velocity u from the top of a tower. If it strikes the ground with velocity 3u, the time taken by the ball to reach the ground is

A

`(u)/(g)`

B

`(2u)/(g)`

C

`(3u)/(g)`

D

`(4u)/(g)`

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The correct Answer is:
D
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