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  1. y = y1 + y2 where y1 = 1/2 a t^2 y2 = v^2 / (2 g) = (a t)^ / (2 g)  [from energy conservation] then y = 1/2 a t + (a t)^2 / (2 g) y = 0.5*39*2.9^2 + (39*2.9)^2 / (2*9.8) = 816.6 m

    1 Answers · Science & Mathematics · 22/09/2020

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