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mgh = mv²/2
gh = v²/2
h = v²/2g
h = 10²/20 = 5m
Ec = Ep + Ek
Ec = 4 * 10 * 5 = 200J
Ep na wys. 1,25m = 1/4 * 200J = 50J
Ek na wys. 1,25m = 200J - 50J = 150J