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Homework Statement:
 Consider a cube to have a density of 2.0kg/m^3. What is its relativistic density at 0.95c?
Homework Equations:

Lm = Ls/(1v^2/c^2)^  1/2
mm = ms/(1v^2/c^2)^  1/2
Density = mass/volume
We never learned how to use these formulas, so I'm pretty much grasping for straws. I got 2.04 kg/m^3. Can anyone check my work/teach me proper methods if I'm wrong? Thanks.