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vi = 60 km/h
vf = 20 km/h
t = 8s
a = ?
Pasamos las unidades al SI
60 km/h
(60 km/h) / (3,6) = 16,67 m/s
20 km/h
(20 km/h) / (3,6) = 5,56 m/s
Calculamos la aceleración.
a = (vf - vi)/t
a = (5,56 m/s - 16,67 m/s)/8s
a = (- 11,11 m/s)/8s
a = - 1,39 m/s²
La aceleración es de - 1,39 m/s²