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Mathematics
Problem
A ball is thrown vertically upward from ground level. Its height (in metres) after
t
t
t
seconds is given by
h
(
t
)
=
−
5
t
2
+
20
t
h(t)= -5t^{2}+20t
h
(
t
)
=
−
5
t
2
+
20
t
. After how many seconds will the ball hit the ground again?
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