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A stone projected at angle 'theta' with...

A stone projected at angle `'theta'` with horizontal from the roof of a tall building falls on the ground after three second. Two second after the projection it was again at the level of projection. Then the height of the building is `-`

A

`5m`

B

`25 m`

C

`20 m`

D

`15 m`

Text Solution

Verified by Experts

The correct Answer is:
D
`2=(2u_(y))/(g) rArr u_(y)=10 m//s`
Now, `H=-u_(y)t +(1)/(2) g t_(2)`
`=-30+45 =15 m`
.
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