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Mathematics, 04.02.2020 09:46 jose200144

If a toy rocket is launced vertically upward from ground level with an inital velocity of 128 feet per second, then its high h, after t seconds is given by the equation h(t)=-9t^2 +81 round to the nearest foot when does the ball hit the ground?

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If a toy rocket is launced vertically upward from ground level with an inital velocity of 128 feet p...
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