A skydiver jumps from a moving aircraft at a point directly above a fixed point, O, on the ground. The trajectory of the skydiver is then modelled by the function
where  is the height of the skydiver above the ground and  is the horizontal distance along the ground from point O.          Â
(i)Â Â Â Â Â Â Explain the significance of the value 3200 in the model.
(ii)Â Â Â Calculate the horizontal distance the skydiver covered upon landing.
Sketch a graph of against .
Explain why the model is not suitable for values of larger than 80 m.
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