A projectile is thrown upward so that it's distance above the ground after t seconds is h=-16t^2+480t. After how many seconds does it reach its maximum height?

t = 15 s

Step-by-step explanation:

A projectile is thrown upward so that it's distance above the ground after t seconds is as follows :

...(1)

We need to find after how many seconds does it reach its maximum height. For maximum height, put

So, it will reach its maximum height in 15 seconds.

paula, cory, and krista

1. 22

2. 1

3. 7

4. 18

step-by-step explanation

e2020 got it right