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Sagot :

Distance AB au sol:
AB^2=(6,4+6,4+5,485)^2+(8,23/2)^2
AB^2=18,285^2+4,115^2
AB^2=351,27
AB=18,742m

Distance parcourue par la balle:
BC^2=AB^2+h^2
BC^2=351,27+2,63^2
BC^2=358,19
BC=18,93m

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