Mathematics, 08.04.2021 23:50, melissadelcid43

5. The school custodian is on the roof of his elementary school throwing tennis balls back to
students below. The height of the tennis ball can be modelled by the function h(t) =
-4.9t2 + 9.8t +9, where h(t) is the height of the ball above the ground, in metres, and t
is the time the ball is in the air, in seconds.
a)
What was the initial height of the ball?
b)
How long was the ball in the air? Show your work.

Answers: 1

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5. The school custodian is on the roof of his elementary school throwing tennis balls back to
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