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Epotencjalna - Ep
Ek = mv2:2
Ek = 3*80*80:2
Ek = 19200:2
Ek = 9600 [J]
Ep = m*g*h
Ep = 3*10*20
Ep = 600 [J]
Ek=mv²/2 = 3*80²/2 = 9600 J
Ep na 20m =mgh = 3*10*20 = 600J
Ek na 20m = 9600J-600J = 9000J