Question 281548
a stone is thrown vertically upwards at a speed of 24 m/s. its height h meters after t seconds is given approximately by the formula h=24t-5t squared. Use this formula to find when the stone is 27 meters up, and explain the double answer.
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h(t) = 24t - 5t^2
-5t^2 + 24t - 27 = 0
*[invoke solve_quadratic_equation -5,24,-27]
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at t=1.8 seconds it's at 27 meters and rising.
at t=2.4 seconds it's at its max height and starts to fall.
at t=3 seconds it's at 27 meters and falling.