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Los datos que tienes son:
vi = 50 km/h
vf = 100 km/h
t = 4 s
a = ?
Pasas las unidades al SI
vi = (50 km/h) (1000 m) / (1 km) (1 h) / (3600 s) = 13,89 m/s
vf = (100 km/h) (1000 m) / (1 km) (1 h) / (3600 s) = 27,78 m/s
Calculamos la aceleración del coche.
a = (vf - vi)/t
a = (27,78 m/s - 13,89 m/s)/4s
a = (13,89 m/s)/4s
a = 3,47 m/s²
Respuesta
a = 3,47 m/s²