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A body is thrown horizontally from the top of a tower of height `5 m`. It touches the ground at a distance of `10 m` from the foot of the tower. Find the initial velocity of the body.

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`O` to `B`:
`y = 5 = (1)/(2) g t^(2) rArr t = 1 s`
`x = ut rArr 10 = u xx 1 rArr u = 10 m//s`
OR
`y = (gx^(2))/(2u^(2))`
`5 = (10(10)^(2))/(2u^(2)) rArr u = 10 m//s`
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