Here's the question you clicked on:
jkev1
Find the time, t, in seconds it takes for an object to fall from the top of a 1600 ft building by using the function (hint: set h=0).
the function is h=-16t^2+1600
\[mgh=\frac12mv^2\] \[v=\sqrt{2gh}\] \[\sqrt{2gh}=gt\] \[\frac{\sqrt{2gh}}{g}=t\] maybe
or simply; when t^2 = 100 :/