Ep=m*g*h
m=4kg
g=10m/s2
h=20m
Ep=4kg*10m/s2*20m
Ep= 800J=0,8kJ
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Ep=m*g*h
m=4kg
g=10m/s2
h=20m
Ep=4kg*10m/s2*20m
Ep= 800J=0,8kJ
Prosze bardzo...