-100=-1/2(9.8)t^2

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Solution for -100=-1/2(9.8)t^2 equation: 


t in (-oo:+oo)

-100 = 9.8*(-1/2)*t^2 // - 9.8*(-1/2)*t^2

-(9.8*(-1/2)*t^2)-100 = 0

4.9*t^2-100 = 0

4.9*t^2 = 100 // : 4.9

t^2 = 20.40816327

t^2 = 20.40816327 // ^ 1/2

abs(t) = 20.40816327^(1/2)

t = 20.40816327^(1/2) or t = -20.40816327^(1/2)

t in { 20.40816327^(1/2), -20.40816327^(1/2) }

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