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A ball is kicked upwards from a rooftop 6m above the ground. It reaches a maximum...

A ball is kicked upwards from a rooftop 6m above the ground. It reaches a maximum height of 9m. At 10s, the ball is 1m above ground. Given that the initial kick is at 0s and the ball follows a quadratic trajectory, at what time does the ball reach its maximum height? Give your answer in exact form. Hint: your answer must be positive

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