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A bail is thrown vertically upward from the roof of a school that is 23 m high. The equation which gives its height above the

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A bail is thrown vertically upward from the roof of a school that is 23 m high. The equation which gives its height above the ground, in meters, after t seconds is h[t] = 4.9t2 + 18t + 23, t 2 0. Determine the rate of change of the height of the hall after 2 secs

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