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v = vo + at
v: velocidad final (72 km/h)
vo: velocidad inicial (0 km/h) Partiendo del reposo
a: aceleración (? m/s^2)
t: tiempo (40 s)
Despejando a
a = (v - vo) / t
a = (72 km / h) / (40 s)
72 km/h * (1000 m / 1km) * (1 h / 3600 s) = 20 m/s
a = (20 m/s) / (40 s)
a = 0,5 m/s^2
Desplazamiento:
v^2 = vo^2 + 2ax
Despejando x:
x = (v^2 - vo^2) / (2a)
x = (20 m/s)^2 / (2* 0,5 m/s^2)
x = 400 m