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vi = 12 m/s
vf = 144 km/h
a = 2 m/s²
t = ?
Pasamos las unidades al SI
vf = (144 km/h) (1000 m) / (1 km) (1 h) / (3600 s) = 40 m/s
Calculamos el tiempo.
t = (vf - vi)/a
t = (40 m/s - 12 m/s)/2 m/s²
t = (28 m/s)/ 2 m/s²
t = 14 s
El tiempo que tarda es 14 segundos