OpenStudy (anonymous):

a ball is thrown vertically upward from the ground. its distance in feet from the ground in t seconds is s=-16t^2+144t. After how many seconds will the ball be 288 feet from the group?

6 years ago
OpenStudy (anonymous):

3 seconds

6 years ago
OpenStudy (anonymous):

Plug 299 for s and you will get: 288 = -16t^2 + 144t. Solve the quadratic, pick the smallest positive root for it., since you are solving for the upward time. That's, t = 3 seconds as @Redlinl stated.

6 years ago