+10 A ball is thrown vertically upward in the air from the top of a cliff. Its height above the ground is approximated by the
relation h = -4t2 +32t + 80, where h is the height in metres above the ground level and t is the time in seconds. Include
a labelled diagram showing your answer.
a) How long is the ball above 80 m? Show/Explain how you know.
b) How long is the ball in the air? Show/Explain how you know.
