Posted by **elizabeth** on Tuesday, March 29, 2011 at 12:09pm.

A ball is launched into the air from below a cliff. after t seconds its height above the cliff top is h metres, and is given by the equation

h = − 4.9t 2 + 19.6t − 14.6.

Calculate, to the nearest metre, the maximum height the ball achieves above the cliff top.

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