A ball is thrown upward from the ground so that its height h (in m) after t seconds
is given by the formula h=15t-5t^2.Find the range of values of t such that the
height of the ball from the ground is more than 10m.
F.5 MATHS
2010-10-12 4:57 am
回答 (1)
2010-10-12 5:03 am
✔ 最佳答案
The height of the ball from the ground is more than 10m.h > 1015t - 5t^2 > 103t - t^2 > 2t^2 - 3t + 2 < 0(t - 1)(t - 2) < 0Case 1 :(t - 1) < 0 and (t - 2) > 0 t < 1 and t > 2It have no solution.Case 2 :(t - 1) > 0 and (t - 2) < 0t > 1 and t < 21 < t < 2
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