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W1=20N*10m
W2=10N*5m
WC=200Nm+50Nm=250Nm=250J
1.
h=1m (2m - 1m)
W=?
g=10m/s² (przyśpieszenie ziemskie)
m=2kg
W=Ep=mgh
W=Ep=mgh=2kg*10m/s²*1m=20J