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15 September, 05:09

H (t) = - 16t2 128t 144. After how many seconds does the object hit the ground?

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  1. 15 September, 07:50
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    H (t) = - 16t2+128+144 = 0

    -t2 + 8t + 9 = 0

    t2-8t-9=0

    t2 + t - 9t - 9 = 0

    t (t+1) - 9 (t+1)

    (t+1) (t-9) = 0

    t=-1 or t=9

    corrent answer is therefore t=9
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