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Problem
The height h (in metres) of a ball thrown vertically upward from the top of a cliff is given by
h
=
−
5
t
2
+
45
t
+
100
,
h = -5t^{2} + 45t + 100,
h
=
−
5
t
2
+
45
t
+
100
,
where t is the time in seconds after it is thrown. After how many seconds will the ball reach the ground at the foot of the cliff?
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