Question

Gianna is going to throw a ball from the top floor of her middle school. When she throws the ball from 48feet above the ground, the function h(t)=−16t2+32t+48 models the height, h, of the ball above the ground as a function of time, t. Find the zero of this function that tells us when the ball will hit the ground.

Answer 1

t=3 the ball hits the ground

Explanation:

To find the zero means we will equate the function to zero and then solve, that is

+ 32t + 48 = 0

by factorizing , we have

(t+1)(-16t+48) = 0

Therefore:

t = -1 or t = 3

since time can not be negative , then , t = 3 seconds

Answer 2

T1 = 0

T2 = 2

Explanation:

0 is when the ball first went up