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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

`3u^2//g`

B

`4u^2 //g`

C

`6u^2 //g `

D

`9u^2//g`

Text Solution

Verified by Experts

The correct Answer is:
B
`v^2 = u^2 + 2gh`
`rArr (3u)^2 = (-u)^2 + 2gh rArr h = (4u^2)/(g)`
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