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Las posiciones en esos instantes son: (omito unidades)
X8 = 1/2 a . 8²
X7 = 1/2 a . 7²
Restamos: X8 - X7 = 30 = 1/2 a (64 - 49)
Por lo tanto a = 4 m/s²
Análogamente:
X10 = 1/2 . 4 . 10² = 200 m
X9 = 1/2 . 4 . 9² = 162 m
La distancia es X10 - X9 = 200 - 162 = 38 m
Saludos Herminio