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[tex]v= \frac{90}{4}
v=22.5
Donde:
v = Velocidad Final.
u = Velocidad Inicial.
a = Aceleración.
t = Tiempo.
Datos:
v = 90 km /h ---> a m/s -->25 m/s.
u = ???
a = 1.2 m/s²
t = 4 s
Reemplazamos:
25 m/s = u + ( 1.2 m/s²)*(4 s)
25 m/s = u + 4.8 m/s
20.2 m/s = u
La velocidad inicial deberá ser de 19.2 m/s.