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Sacamos los datos:
vi = 108 km/h
vf = 0 m/s
t = 10 s
a = ?
Convertimos las unidades al SI, primero.
vi = (108 km/h) (1000 m) / (1 km) (1 h) / (3600 s) = 30 m/s
Calculamos la aceleración
a = (vf - vi)/t
a = (0 m/s - 30 m/s)/10s
a = (- 30 m/s)/10s
a = - 3 m/s²
Respuesta.
a = - 3 m/s²