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v² = 2gh
h = v²/2g
Podstaw v = 400km/h = 111,(1)m/s
v² ≈ 12345m²/s²
g = 10m/s²
h ≈ 12345 m²/2s²(10m/s²) = 12345 m / 20 = 617,25 m.