Analyse and optimise a quadratic model
A model for a programmed drone flight uses \(t\) for time after the start. The model output is height, measured in metres
\[y=-\frac{1}{4}(t-3)^2 + 15\]
The meaningful domain is \(0\le t\le 5\), where t is measured in seconds
The output level \(\frac{51}{4}\) metres is used for the threshold question