Question 758201: Suppose a football is kicked from the ground and its height in feet above the ground is given by h = -3.9t2 + 15.6t. The height above the ground is "h". The time in seconds, after the ball is kicked, is "t". How long is the ball in the air?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! Suppose a football is kicked from the ground and its height in feet above the ground is given by h = -3.9t2 + 15.6t. The height above the ground is "h". The time in seconds, after the ball is kicked, is "t". How long is the ball in the air?
-----
Solve -3.9t^2 + 15.6t = 0
-3.5t(t - 4) = 0
Positive solution:
t = 4
-----
In the air for 4 seconds.
Cheers,
Stan H.
==========================
|
|
|
