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15 February, 21:45

A teacher uses a strong slingshot to release an object from the top of a school high in the air. The function a (t) = -16t^2+128t+50 gives the approximate altitude, in feet, of the object t seconds after it is released. How long will it be before the object hits the ground? Round to the nearest second.

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  1. 15 February, 21:47
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    Ground: y = 0

    - 16t² + 128t + 50 = 0

    Apply quadratic equation.

    t = 0, 8 (rounded to the nearest second)

    8 seconds
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