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A ball is thrown from a point O aiming a...

A ball is thrown from a point O aiming a target at angle `30^(@)` with the horizontal so that the ball hits the target at B but the ball hits at point A, a vertical distance h below B. If the intial velocity of the ball is `20 ms^(-1)` and the horizontal distance between O and C is 10 m. Find the value of h.

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