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h = 20 m
Ep = 400 J
g = 10 N/kg
dit ; m ?
dijawab :
Ep = m x g x h
400 = m x 10 x 20
400 = m x 200
m = 400/200
m = 2 kg
400 = m. 10 .20
400/200 = m
2 = m