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The height above ground level in metres of a missile launched vertically, is given by h(t)=-16th^3+100t. At what time is missile 50m in above ground level?

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Answered by oobleck
First, fix the typo, and then solve
-16t^2+100t = 50
8t^2 - 50t - 25 = 0
using the quadratic formula.
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