A boy playing on the roof of a 10 m high...

A boy playing on the roof of a `10 m` high building throws a ball with a speed of `10 m//s^(-1)` at an angle of `30^(@)` with the horizontal. How far from the throwing point will the ball be at a height of `10 m` from the ground?

5. 20 m

4 . 33 m

`2.60 m`

8 . 66 m

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