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d = (2n-1)a/2
n es el segundo en este caso el 7
40=(2(7)-1)a/2
80 = 13a
a= 6,15 m/s² aprox
ahora en el doceavo segundo (n=12)
d= (2(12)-1)(6,15/2)
d= 70,725
rpta: 70,725 mt