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Ep = 50.000 J
h = 5 m
g = 10 N/kg
dit : m ?
dijwb :
Ep = m x g x h
50.000 = m x 10 x 5
50.000 = m x 50
m = 50.000/50
m = 1000 kg
50kJ = m . 10 N/kg . 5 m
50kJ = m . 10J/kg
m = 50.000 J / 10 J/kg
= 5000 kg