Answer:
2 seconds
Step-by-step explanation:
Given : Heather hits a tennis ball upward with an initial speed of 32 feet per second.
To Find: After how many seconds does the ball hit the ground
Solution:
Formula : [tex]h = rt -16t^2[/tex]
Where h is the height
r is the initial speed
So, initial speed = r = 32 feet per second
Now we are supposed to find After how many seconds does the ball hit the ground i.e. h =0
Substitute h=0 in the formula
[tex]0 = 32t -16t^2[/tex]
[tex]16t^2 = 32t [/tex]
[tex]16t = 32 [/tex]
[tex]t = \frac{32}{16} [/tex]
[tex]t = 2[/tex]
Thus after 2 seconds the ball will hit the ground.
