V = g * корень(2 * H / g) = 9.8 * корень(2 * 20 / 9,8) = ~19.8 м/с
V/2 = 9.9 м/с
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V = g * корень(2 * H / g) = 9.8 * корень(2 * 20 / 9,8) = ~19.8 м/с
V/2 = 9.9 м/с