-12=1/2(-9.8)t^2

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Solution for -12=1/2(-9.8)t^2 equation: 


t in (-oo:+oo)

-12 = -9.8*(1/2)*t^2 // + -9.8*(1/2)*t^2

-(-9.8*(1/2)*t^2)-12 = 0

4.9*t^2-12 = 0

4.9*t^2 = 12 // : 4.9

t^2 = 2.44897959

t^2 = 2.44897959 // ^ 1/2

abs(t) = 2.44897959^(1/2)

t = 2.44897959^(1/2) or t = -2.44897959^(1/2)

t in { 2.44897959^(1/2), -2.44897959^(1/2) }

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