Question

An arrow is shot upward with a velocity of 64 feet per second. Using the formula h(t)=64t-16t^2

Answer 1

`t = 4` : Arrow hits the ground after 4 seconds.

Explanation:

I assume you are going to ask when the arrow hits the ground, right? If so, follow these steps!

`64t-16t^2=0`

We can factor/distribute to solve this...

`16t(4-t)=0`

If this is true, then that means that...

`16t=0`
`or`
`4-t=0`

`t=0`
`or`
`-t=-4`

So the solution would be

`t = 0`
`or`
`t=4`

In this case, we want to use 4.