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vi = 15 km/h
vf = 60 km/h
t = 20s
a = ?
Pasamos las unidades al SI
15 km/h
(15 km/h) / (3,6) = 4,17 m/s
60 km/h
(60 km/h) / (3,6) = 16,67 m/s
Para calcular la aceleración aplicamos esta fórmula:
a = (vf - vi)/t
a = (16,67 m/s - 4,17 m/s)/20s
a = 12,5 m/s / 20s
a = 0,625 m/s²
La aceleración es de 0,625 m/s²