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Los datos son:
vi = 36 km/h
vf = 0 m/s
t = 5 s
a = ?
Pasas las unidades al SI
vi = (36 km/h) (1000 m) / (1 km) (1 h) / (3600 s) = 10 m/s
Calculamos la aceleración
a = (vf - vi)/t
a = (0 m/s - 10 m/s)/5s
a = (- 10 m/s)/5s
a = - 2 m/s²