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a=F/m s=at²/2 2s=at^2 2s=F/m * t^² 2s/(F/m)=t^² t=0,09 ( w przybliżeniu) a=600N/2kg=300 m/s^2 v=at= 300 * 0,09= 27 m/s
Ek=729 J
600N x 1,2m = 720J