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Los datos que tienes son:
vi = 30 m/s
vf = 0 m/s
t = 5 s
a = ?
Calculamos la aceleración
a = (vf - vi)/t
a = (0 m/s - 30 m/s)/5s
a = (- 30 m/s)/5s
a = - 6 m/s²
Respuesta.
a = - 6 m/s²
a= (0m/s - 30 m/s)/5s
a= -6m/s^2 es negativa a que desacelera al frenar