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m = 0,5 kg
h = 40m
t = 2 s
Spadek swobodny
V = g *t
V = 10 m/s² * 2 s
V = 20 m/s
Energia kinetyczna
Ek = mv²/2
Ek = 0,5 kg * (20m/s)² /2
Ek = 100 J