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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
9.8 = (19.6-4.9)/t // - (19.6-4.9)/t
9.8-((19.6-4.9)/t) = 0
-14.7*t^-1 = -9.8 // : -14.7
t^-1 = 0.66666667
-1 < 0
1/(t^1) = 0.66666667 // * t^1
1 = 0.66666667*t^1 // : 0.66666667
1.49999999 = t^1
t = 1.49999999
t = 1.49999999
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