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Vf=Vo+at
Donde:
Vf = Velocidad final = 0m/s (se detiene)
Vo = Velocidad Inicial = 40m/s
a = Aceleración = -5m/s^2(Desacelera)
t = Tiempo = ???
Vf=Vo+at
Despejamos:
t=(Vf-Vo)/a
t=(0 m/s - 40m/s)/(-5m/s^2)
t= 8s