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h in (-oo:+oo)
(2*2.4)/9.8 = h // - h
(2*2.4)/9.8-h = 0
0.48979592-h = 0 // - 0.48979592
-h = -0.48979592 // * -1
h = 0.48979592
h = 0.48979592
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