Question 396663
h(t) = -16t^2 +560t
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h(t) is the height of the object after t seconds.
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When the object is on the ground the height is zero.
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Solve:
-16t^2+560t = 0
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-16t(t-35) = 0
t = 0 or t = 35
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That means the object is on the ground at the beginning
and it is back on the ground after 35 seconds.
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Cheers,
Stan H.