Question 1032888
<pre>

If a projectile is thrown into the air with an upward velocity of
v<sub>0</sub>, its height in feet after t seconds is given by the function 

   h<sub>t</sub> = -16t<sup>2</sup>+v<sub>0</sub>x+h<sub>0</sub>. 

to find the time when it reaches its maximum height, use the
vertex formula:

         t = -b/(2a) or -v<sub>0</sub>/(2*-16)

to find the maximum height, substitute that value of t into

   h<sub>t</sub> = -16t<sup>2</sup>+v<sub>0</sub>x+h<sub>0</sub> 

Edwin</pre>