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The equation y = -4.2t^2 + 42t + 18.9 describes the height (in meters) of a ball tossed up in the air at 42 meters per second from a height of 18.9 meters from the ground, as a function of time in seconds. In how many seconds will the ball reach maximum height?

 Feb 13, 2022
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THis is a dome shaped parabola....the max will occur at   t = - b/2a =  - 42 /(2*(-4.2)) = 5 seconds

 Feb 13, 2022

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