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Ek=2kJ=2000J
m=10kg
2000J=10*v²/2
2000J=5*v²
v²=2000/5
v²=400
v=√400
v=20m/s * 3,6 = 72km/h
Odp: To cialo przemieszcza sie z predkoscia 20m/s czyli 72km/h