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Ek1 = O
Ep2 = O
Ek2 = mV²/2
Ep1 + Ek1 = Ep2 + Ek2
mgh = mV²/2
gh = V²/2
2gh = V²
V = √2gh
g = 10 m/s²
h = 5 m
V = √5 x 10 x 2
V = √100 = 10 m/s
Odp. Uderzy z prędkością 10 m/s