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v=g*t
v=20m/s
Ek=mvkwadrat/2
Ek=2kg * 400(m/s)kwadrat / 2 = 400J
2.
P=2,5KW=2500W
t=2h=120s
W=P*t
W=2500W*120s=300000J
300000=300KJ
nie wiem jak te jednostki pozmieniać ale tak powinno być dobrze