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## Homework Statement

It's a two part question, but it basically says this:

a bolt drops from an elevator 9.0 ft from the ground, at what time does it hit the ground?

## Homework Equations

x = x0 + vx0t + 1/2ax(t^2)

## The Attempt at a Solution

since it's a free fall question and we're starting from above ground:

0 = 9.0ft - 16ft/s^2 (t^2)

-9.0/-16 = t^2

t = 0.75 seconds.

But the book says that t = 0.71 seconds..

thanks