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Cm is a unit of distance; kg is a unit of weight. They are incompatible. 0.5 kg = 50,000 cg
I think you meant 3.15 km, not kg. Kg is a unit of weight. Anyway, 3.15 km=315000 cm.
400 kg
Strangely enough, 2 centimetres is 2 cm.
2 km = 2*105 cm