At what time does the ball reach its maximum height if it is thrown upward from the top of a 50 50 50 m \text{m} high building with an initial speed of 20 20 20 m/s \text{m/s} , and its height above the ground is given by the equation s ( t ) = − 10 t 2 + 20 t + 50 s(t) = -10t^2 + 20t + 50 s ( t ) = − 10 t 2 + 20 t + 50 ?

At what time does the ball reach its maximum height if it is thro...

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