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Tue 12 February 2013 Quiz 19

Quiz 19

Tue 12 February 2013

tags: AC.12 AC.13 AC.16 AC.17

The following two equations describe the height of a missile above (or below) the surface of the ocean, when it is launched from a submarine:

$ y = -t^2 + 12t - 20 $

$ y = -5t^2 + 30t - 20$

After how many seconds will each missile break through the surface of the water?
After how many seconds will each missile crash back into the water?
For how many seconds is each missile above the surface?
Hint: $t = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}$

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