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Debemos hallar la aceleración:
x = 1/2 a t² (velocidad inicial nula)
Para t =1 s, x 0 30 m:
a = 2 x / t² = 60 m / (1 s)² = 60 m/s²
x9 = 1/2 . 60 . 9² = 2430 m
x8 = 1/2 . 60 . 8² = 1920 m
Por lo tanto d = 2430 - 1920 = 510 m
Saludos Herminio