Answers

2014-08-08T07:39:56+08:00
Since we are given the formula: S = 144T - 16T^2, we substitute 128 ft in S to find T: 128 = 144 - 16T^2 --> 16(T^2 - 9T + 8) = 0 --> T^2 - 9T + 8 = 0 --> (T - 8)(T - 1) = 0. T = 1 s and 8 s.
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