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S= distancia/espacio recorrido
Vi=velocidad inicial
Vf=velocidad final
Vi= 140km/h------350/9m/s
Vf=60km/h------50/3 m/s
t= 3 seg
Vf= Vi - at
50/3 = 350/9 -a 3
3a=350/9 - 50/3
a=(200/9)/3
a= 7.407 m/s²
Vf ²=Vi² - 2aS
2aS= Vi² - Vf ²
2x(7.407) S= (350/9) ² - (50/3) ²
14.814xS= 1234.567
S = 83.34 m