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Ekmax = Ek + Ep
m Vo²/2 = m V²/2 + mgh
dzielimy obustronnie przez m
Vo²/2 = V²/2 + gh
mnożymy obustronnie przez 2
Vo² = V²+ 2gh
V² = V₀² - 2gh
V = √V₀² - 2gh = √(6m/s)² - 2 ×10[m/s²] × 1,35 m = √9[m²/s²] =3m/s