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A ball is launched into the air from below a cliff, such that after t seconds its height above the cliff top is h metres,

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A ball is launched into the air from below a cliff, such that after t seconds its height above the cliff top is h metres, and is given by the equation h = - 4.9t2 + 19.6t - 9.6 Calculate, to the nearest metre, the maximum height the ball achieves above the cliff top. Enter your answer below, as a number without units

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