Question 1119907
<font face="Times New Roman" size="+2">


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ h(t)\ =\ -\frac{1}{2}gt^2\ +\ v_ot\ +\ h_o]


You want to solve for *[tex \Large t] when *[tex \Large h(t)\ =\ 0] where *[tex \Large g\ =\ 32\text{ fps^2},\ \ ] *[tex \Large v_o\ =\ 48\text{ fps}] and *[tex \Large h_o\ =\ 400\text{ feet}]


Plug in the numbers and solve the quadratic.  The answer will be the positive root.
								
								
John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it
<img src="http://c0rk.blogs.com/gr0undzer0/darwin-fish.jpg">
*[tex \Large \ \
*[tex \LARGE \ \ \ \ \ \ \ \ \ \  
								
{{n}\choose{r}}
</font>