9.8=56/t^2

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Solution for 9.8=56/t^2 equation: 


D( t )

t^2 = 0

t^2 = 0

t^2 = 0

1*t^2 = 0 // : 1

t^2 = 0

t = 0

t in (-oo:0) U (0:+oo)

9.8 = 56/(t^2) // - 56/(t^2)

9.8-(56/(t^2)) = 0

9.8-56*t^-2 = 0

-56*t^-2 = -9.8 // : -56

t^-2 = 0.175

-2 < 0

1/(t^2) = 0.175 // * t^2

1 = 0.175*t^2 // : 0.175

5.71428571 = t^2

t^2 = 5.71428571 // ^ 1/2

abs(t) = 5.71428571^(1/2)

t = 5.71428571^(1/2) or t = -5.71428571^(1/2)

t in { 5.71428571^(1/2), -5.71428571^(1/2) }

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