When Mr. Smith kicks a football, it has a vertical speed of 20 m/s, and its height, h in meters after t seconds can be modeled by the equation h=20t−5t^2 .
Part A.
How long is the football in the air before it lands on the ground?
seconds
Part B
In how many seconds will the football reach its maximum height?
seconds
Part C
What is the maximum height that the football will reach?
meters