First you need to look at what you have, in this problem you have 3 variables, h, g, and t. H is given to you, it is 6, t is what you are solving for, and g is 32ft/sec. With this we can plug our numbers into the equation.
6=-1/2(32)(t^2)+6
6=-16(t^2) +6
16= t^2
4=t
The time of the fall would be 4 seconds.
