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Ek = 30.000 J
Ditanya : Massa ?
Jawab : Ek= 1/2 mv^2
30.000 J = 1/2 . m . (10)^2
30.000 J = 1/2 . m . 100
30.000 J = 50 m
m = 30.000 / 50
m = 600