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Sacas los datos que te dan:
vi = 50 km/h
a = 4 m/s²
t = 3 s
vf = ?
Conviertes las unidades al SI
vi = (50 km/h) (1000 m) / (1 km) (1 h) / (3600 s) = 13,89 m/s
Calculamos la rapidez final
vf = vi + at
vf = 13,89 m/s + (4 m/s²) (3s)
vf = 13,89 m/s + 12 m/s
vf = 25,89 m/s
Respuesta
vf = 25,89 m/s