I think you meant 3.15 km, not kg. Kg is a unit of weight.
Anyway, 3.15 km=315000 cm.
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142.88 kg
1 MPa = 10 kg/cm2 (MPa is pressure, kg/cm2 is mass/area not actual pressure)
10 kg/m²
Cm is a unit of distance; kg is a unit of weight. They are incompatible. 0.5 kg = 50,000 cg
IT equals to 1.2 kg