Q. A body is projected from the top of a tower with a velocity $\bar{u}=3 \hat{ i }+4 \hat{ j }+5 \hat{ k } ms ^{-1}$, where $\hat{ i }, \hat{ j }$ and $\hat{ k }$ are unit vectors along east, north and vertically upwards respectively. If the height of the tower is $30\, m$, horizontal range of the body on the ground is $\left(g=10\, ms ^{-2}\right)$
AP EAMCETAP EAMCET 2017
Solution: