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Ek=Ep
Ek = mv²/2
Ep = mgh
mgh = mv²/2 -skracamy m
gh = v²/2 - razy dwa obie strony rownania
2gh = v²
g = 10 - stała dla ziemi
20 h = v²
20h = 5²
20h = 25
h = 25/20 = 1,25 m
Piłka wzniesie sie na wys. 1,25 metra.