40=1/2(-9.8)t^2

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Solution for 40=1/2(-9.8)t^2 equation: 


t in (-oo:+oo)

40 = -9.8*(1/2)*t^2 // + -9.8*(1/2)*t^2

40-(-9.8*(1/2)*t^2) = 0

4.9*t^2+40 = 0

4.9*t^2 = -40 // : 4.9

t^2 = -8.16326531

t belongs to the empty set

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