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**1. A ball is thrown vertically upward with an initial velocity of 27.0 m/s. Neglecting air resistance, how long is the ball in the air?**

## Homework Equations

vf (v final) = v0 (v initial) + at[/B]

## The Attempt at a Solution

I set final velocity equal 0. So..

0 = 27.0 m/s (initial velocity) + (-9.8 m/s2)t

-27.0 m/s divided by -9.8

and it turned out to be equal to 2.76 seconds.

What am I doing wrong here? I saw a similar thread and the problem was solved the same way; but apparently my answer is incorrect.