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72km/h = 72*5/18 m/s = 20m/s
Luego, por MRUV:
e = (vo+vf)t/2 = (vel. inicial + vel. final)*tiempo empleado/2
e = (20+0)*4/2
e = 40m
Saludos!!
72kmh/3.6=20ms-1
Sabemos que la velocidad final será 0, por lo que:
s=(u+v/2)t
s=(20/2)4
s=40m