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14 December, 21:10

After how many seconds is the height 68 feet? When the equation is h=-16t2+64t+8

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  1. 14 December, 21:42
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    68=-16t2+64t+8

    16t2-64t+60=0

    4t2-16t+15=0

    (2t-5) (2t-3) = 0

    t=5/2 or 3/2

    The object is at 68 feet after 3/2 secs, and returns to 68 feet after another second ...
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