A ball is projected upward from ground level. After t seconds, it’s height in feet is a function defined by f (t) = -16t^2 + 96t. In how many seconds will the rocket be at a height of 128 ft above the ground?

t = 2 s and t = 4 s

Step-by-step explanation:

A ball is projected upward from ground level. After t seconds, it’s height in feet is a function defined by,

We need to find in how many seconds will the rocket be at a height of 128 ft above the ground.

It means,

So, it will be at a height of 128 feet at 2 second and 4 second.

i hope this is what you were looking for.

see attached graph