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A stone projected at angle theta with ho...

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

A

`5m`

B

25 m

C

20m

D

15m

Text Solution

Verified by Experts

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