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0.04 = 0.12t/ t^2 +2
Ahora despeja:
0.04(t^2 +2) = 0.12t
0.04t^2 + 0.08 = 0.12t
0.04t^2 -0.12t +0.08 = 0
Solucionas la ecuación por formula general
a= 0.04
b= -0.12
c= 0.08
Susituyes valores en formula
-(-0.12) +- raiz( (-0.12)^2 -4(0.04)(0.08))/2(0.04)
(0.12 +- raiz( 0.0144 - 0.0128)/0.08
(0.12 +- raiz (0.0016)/0.08
(0.12+- 0.04)/0.08
x1= .12 + 0.04/ 0.08
x1= .16/ .08
x1= 2
x2= .12 - 0.04 /0.08
x2 = .08/.08
x2 = 1
Por lo tanto puedes tomar cualquiera de los dos valores