100-1/2(9.8)t2

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Solution for 100-1/2(9.8)t2 equation: 


t in (-oo:+oo)

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

100-4.9*t^2 = 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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