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If the required time is measured from 0 then s = t2 - 8t, therefore 9 = t2 - 8t, which can be written as t2 - 8t - 9 = 0

This equation can be factored as (t - 9)(t + 1) = 0

As we are only concerned with a positive time then the answer is when t - 9 = 0, thus t = 9 seconds.

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