# Juan hits a baseball. The equation #h=-16t^2+120t# models the height h, in feet, of the ball after t seconds. How long is the ball in the air?

##### 1 Answer

Jul 15, 2017

When the ball returns to ground level,

This is a quadratic equation we can solve to find the roots

#### Explanation:

For a quadratic in the form

We know:

For

So:

Therefore: