Simple Gravity Problem: Finding an Object's Maximum Height

[mwhowell]

Homework Statement

An object is thrown strait up. It rises 80m and falls back to its original height. Take the object's original height as the origin and use g=10m/s^2.

How long does it take the object to reach its max height?

Homework Equations

The Attempt at a Solution

I learned this in physics 1 and I feel destroying my dorm room because I know how to do this but I am having a complete mental block and can't seem to do anything with this. I am getting 8s but that can't be right because it does not fit on the graph I need to graph the problem on.

 

[p21bass]

Are you sure you're solving only for the max height? Or did you solve for the time the object returned to its original height?